Two new complexes, [W2Ag2S8?Ca(DMF)6]n 1 and [WAgS4?Na(DMF)3]n 2, have been synthesized and characterized. Single-crystal X-ray analyses show both 1 and 2 have {WAgS4}n anion linear chains, but 1 has a discrete [Ca(DM...Two new complexes, [W2Ag2S8?Ca(DMF)6]n 1 and [WAgS4?Na(DMF)3]n 2, have been synthesized and characterized. Single-crystal X-ray analyses show both 1 and 2 have {WAgS4}n anion linear chains, but 1 has a discrete [Ca(DMF)6]2+ cation while 2 is a linear chain. UV-Visible-Near-IR spectroscopy data show that the bandgaps of the two complexes are 1.86 and 1.99 eV, respectively. Electrical conductivity measurements reveal the conductivities of 1 and 2 are 10?7 and 10?8 Scm?1, respectively and they exhibit thermally activated temperature depen- dence, which may be attributed to semiconductors.展开更多
In the present study,2,6-bis(diphenylphosphino)pyridine((Ph_(2)P)_(2)py)-supported cis-and trans-Pt_(2)Ag_(2)alkynyl complexes were prepared and characterized by X-ray crystallography.Although the cis-Pt_(2)Ag_(2)comp...In the present study,2,6-bis(diphenylphosphino)pyridine((Ph_(2)P)_(2)py)-supported cis-and trans-Pt_(2)Ag_(2)alkynyl complexes were prepared and characterized by X-ray crystallography.Although the cis-Pt_(2)Ag_(2)complexes are slightly emissive at ambient conditions,the trans-Pt_(2)Ag_(2)complexes exhibit moderate photoluminescence in dichloromethane and have strong emission in the solid state,originating from aromatic acetylide to(Ph_(2)P)_(2)py ligand-to-ligand charge transfer(^(3)LLCT)and Pt_(2)Ag_(2)cluster metal-centered(^(3)MC)triplet states.Remarkably,the trans-Pt_(2)Ag_(2)complex[Pt_(2)Ag_(2){(Ph_(2)P)_(2)py}_(2)(CuCC_(6)H_(5))_(4)](SO_(3)CF_(3))_(2)exhibit remarkable luminescent vapochromism with emission red-shifts of 100 nm in response to MeCN vapor,arising from intramolecular structural conversion from staggered to parallel arrangements of two face-to-face Pt(CuCC_(6)H_(5))_(2)moieties,which results in the alteration of the excited-state energy in the solid state as supported by TD-DFT studies.展开更多
A[H3AgI(H2O)PW11O39]3?‐TiO2/ITO electrode was fabricated by immobilizing a molecular polyoxometalate‐based water oxidation catalyst,[H3AgI(H2O)PW11O39]3?(AgPW11),on a TiO2electrode.The resulting electrode was charac...A[H3AgI(H2O)PW11O39]3?‐TiO2/ITO electrode was fabricated by immobilizing a molecular polyoxometalate‐based water oxidation catalyst,[H3AgI(H2O)PW11O39]3?(AgPW11),on a TiO2electrode.The resulting electrode was characterized by X‐ray powder diffraction,scanning electron microscopy,and energy dispersive X‐ray spectroscopy.Linear sweep voltammetry,chronoamperometry,and electrochemical impedance measurements were performed in aqueous Na2SO4solution(0.1molL?1).We found that a higher applied voltage led to better catalytic performance by AgPW11.The AgPW11‐TiO2/ITO electrode gave currents respectively10and2.5times as high as those of the TiO2/ITO and AgNO3‐TiO2/ITO electrodes at an applied voltage of1.5V vs Ag/AgCl.This result was attributed to the lower charge transfer resistance at the electrode‐electrolyte interface for the AgPW11‐TiO2/ITO electrode.Under illumination,the photocurrent was not obviously enhanced although the total anode current increased.The AgPW11‐TiO2/ITO electrode was relatively stable.Cyclic voltammetry of AgPW11was performed in phosphate buffer solution(0.1mol L?1).We found that oxidation of AgPW11was a quasi‐reversible process related to one‐electron and one‐proton transfer.We deduced that disproportionation of the oxidized[H2AgII(H2O)PW11O39]3?might have occurred and the resulting[H3AgIIIOPW11O39]3?oxidized water to O2.展开更多
Two silver（I）-sulfonate complexes,[Ag（NO3）（4,4＇-bipy）][Ag（HL）（4,4＇-bipy）]·2H2O（1） and[Ag（H2O）（4,4＇-bipy）][AgL（4,4＇-bipy）]·2H2O（2）,have been synthesized by in situ reaction（H2L = 2-fo...Two silver（I）-sulfonate complexes,[Ag（NO3）（4,4＇-bipy）][Ag（HL）（4,4＇-bipy）]·2H2O（1） and[Ag（H2O）（4,4＇-bipy）][AgL（4,4＇-bipy）]·2H2O（2）,have been synthesized by in situ reaction（H2L = 2-formylbenzenesulfonic acid,4,4-bipy = 4,4-bipyridine）.1 displays two parallel 1D chains expending to a 3D supramolecule by n—n interactions and O-H…O hydrogen bonds,in which the[Ag（NO3）]or[Ag（HL）]units are joined by bridging 4,4＇-bipy molecules,respectively.The interactions between the complexes and DNA were studied by means of fluorescence spectra and surface-enhanced Raman scattering（SERS） spectra.The special configuration and intercalation effects between 1 and DNA are stronger than that between 2 and DNA.展开更多
Reaction of AgAc with bzdmpymtH in MeOH resulted in the title compound [Ag（bzdmpymt）]6-2MeOH （1.2MeOH）, which was structurally characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis...Reaction of AgAc with bzdmpymtH in MeOH resulted in the title compound [Ag（bzdmpymt）]6-2MeOH （1.2MeOH）, which was structurally characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis. 1.2MeOH belongs to the triclinic system, space group Pi, with a = 10.930（2）, b = 11.646（2）, c = 16.794（3）A, a = 103.97（3）, β = 97.07（3）, γ = 97.94（3）°, V = 2027.2（7） A3, Z = 1, μ = 1.629 mm^-1, Dc = 1.710 mg/m3, T = 193（2） K, CsoH86Ag6N12O2S6, Mr = 2087.25, F（000） = 1044, S = 1.034, R = 0.0355 and wR = 0.0709. In 1.2MeOH, six silver（I） atoms are held together by six bzdmpymt ligands through N and S atoms to form a water-wheel-shaped structure. Each Ag atom is coordinated by two S atoms from two bzdmpymt ligands and one N atom from the third bzdmpymt ligand, giving a trigonal planar coordination geometry. Interactions between the CH3 group of bzdmpymt ligand and one pyrimidyl nitrogen atom in an adjacent molecule afford a one-dimensional hydrogen-bonding chain running along the b axis. The luminescent property of 1.2MeOH was also investigated.展开更多
A three-coordinate Ag（I） complex, [Ag（Mepzpy）（PAr3）]BF4·H2O（1, Mepzpy = 3-methyl-1-（2-pyridyl）pyrazole, PAr3 = tri（o-tolyl）phosphine）, was synthesized from the reaction of Ag（CH3CN）4BF4, PAr3 and Me...A three-coordinate Ag（I） complex, [Ag（Mepzpy）（PAr3）]BF4·H2O（1, Mepzpy = 3-methyl-1-（2-pyridyl）pyrazole, PAr3 = tri（o-tolyl）phosphine）, was synthesized from the reaction of Ag（CH3CN）4BF4, PAr3 and Mepzpy in CH3 CN at room temperature. The compound was characterized by UV-vis, NMR and X-ray single-crystal structure analysis. It crystallizes in triclinic space group P1 with a = 10.2251（5）, b = 10.6014（5）, c = 15.7012（5） A, α = 92.963（3）, β = 92.641（3）, γ = 114.647（4）°, V = 1540.6（1）A 3, Z = 2, Mr = 676.24, Dc = 1.458 g/cm3, F（000） = 688, μ = 6.187 mm^-1, GOOF = 1.038, the final R = 0.0530 and wR = 0.1493 for 6371 observed reflections with I 〉 2σ（I）. Compound 1 is ionic. It is composed of a BF4- anion and a [Ag（Mepzpy）（PAr3）]＋ cation. The Ag（I） ion adopts a distorted trigonal pyramidal coordination geometry defined by two nitrogen atoms and a phosphorous atom. The complex emits blue luminescence with maximum peaks at 470 nm in solid state at room temperature.展开更多
Two new complexes [Ag（bix）]n·n NAA·n H2O（1） and [Cd（NAA）（phen）2（H2O）]2· 2CH3COO-·H2O（2）（bix = 1,4-bis（imidazol-1-ylmethyl）benzene,HNAA = α-naphthylacetic acid,phen = 1,10-phenanthro...Two new complexes [Ag（bix）]n·n NAA·n H2O（1） and [Cd（NAA）（phen）2（H2O）]2· 2CH3COO-·H2O（2）（bix = 1,4-bis（imidazol-1-ylmethyl）benzene,HNAA = α-naphthylacetic acid,phen = 1,10-phenanthroline） have been successfully synthesized under hydrothermal conditions.Their structures have been determined by elemental analyses,IR spectroscopy,TG and single-crystal X-ray diffraction analysis.The intermolecular hydrogen bonding or π-π stacking interactions extend the complexes into a 3D supramolecular structure.Moreover,the luminescent properties of complex 2 have been investigated in the solid state.展开更多
The title complex [(Ag3L2)(ClO4)]n 1, where HL = isonicotinic acid, has been prepared from the reaction of isonicotinic acid with AgClO4?H2O at room temperature and its struc- ture was determined by single-crystal X...The title complex [(Ag3L2)(ClO4)]n 1, where HL = isonicotinic acid, has been prepared from the reaction of isonicotinic acid with AgClO4?H2O at room temperature and its struc- ture was determined by single-crystal X-ray diffraction. The crystal of 1 is of triclinic, space group P1 with a = 8.429(3), b = 10.694(4), c = 10.840(4) ?, α = 119.063(4), β = 100.474(5), γ = 99.901(5)°, V = 800.4(5) ?3, Mr = 1334.53, Dc = 2.769 g/cm3, Z = 2, μ(MoKα) = 3.848 mm-1, F(000) = 632, R = 0.0250 and wR = 0.0582 for 2872 observed reflections with I > 2σ(I). Complex 1 is a two-dimensional network consisting of adjacent one-dimensional chains through Ag–Ag inter- actions.展开更多
The supramolecular compound [(AgI3)(4-HBPFA)2(H2O)] (Mr = 1361.11) was synthesized via the reaction of 1,1?-bis[(4-pyridylamino)carbonyl]ferrocene (4-BPFA) with AgI, and structurally characterized by single-crystal X-...The supramolecular compound [(AgI3)(4-HBPFA)2(H2O)] (Mr = 1361.11) was synthesized via the reaction of 1,1?-bis[(4-pyridylamino)carbonyl]ferrocene (4-BPFA) with AgI, and structurally characterized by single-crystal X-ray diffraction analysis. Crystal data: monoclinic, space group C2/c, a = 1.6783(3), b = 10.646(2), c = 2.5419(5) ?, β = 93.66(3)o, V = 4532.2(16) ?3, Z = 4, Dc = 1.995 g/cm3, F(000) = 2632 and μ = 3.158 mm-1. The compound consists of (4- HBPFA)+, (AgI3)2- and H2O. In the structure, the adjacent (4-HBPFA)+ are linked by C–H…O and N–H…N hydrogen bonds into 1-D chains which are further linked by C–H…I and N–H…I hydrogen bonds as well as intermolecular π-π stacking interactions to form a 3-D supramolecular compound.展开更多
A novel complex [Ag(NIT3Py)3]?(ClO4)(H2O) has been synthesized and structurally characterized by X-ray diffraction method. It crystallizes in the rhombohedral system, space group R 3 with a = 15.8227(17), b = 15.8227(...A novel complex [Ag(NIT3Py)3]?(ClO4)(H2O) has been synthesized and structurally characterized by X-ray diffraction method. It crystallizes in the rhombohedral system, space group R 3 with a = 15.8227(17), b = 15.8227(17), c = 31.445(3) ?, γ = 120°, V = 6817.8(12) ?3, Dc = 1.370 g/cm3, Z = 6, μ = 0.566 mm-1, Mr = 937.18, F(000) = 2916, R = 0.0715, wR = 0.2115 and GOF = 1.086. The structure consists of Ag(NIT3Py)3+ cation moiety, one water molecule and one perchloric ion. The Ag(I) ion is in a trigonal planar coordination environment formed by three nitrogen atoms from three NIT3Py ligand molecules.展开更多
The title complex [AgL（NO3）]2 1, where L = 2-acetamido-5-methyl-1,3,4-thiadiazole, was prepared from the reaction of 2-acetamido-5-methyl-1,3,4-thiadiazole with AgNO3 at room temperature and its structure has been d...The title complex [AgL（NO3）]2 1, where L = 2-acetamido-5-methyl-1,3,4-thiadiazole, was prepared from the reaction of 2-acetamido-5-methyl-1,3,4-thiadiazole with AgNO3 at room temperature and its structure has been determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P2t/c with a = 12.5454（8）, b = 11.9672（12）, c = 6.8925（6） A, β = 98.468（2）°. V= 1023.51（15） A^3, Mr= 3127.08, Dc = 2.123 g/cm^3, Z= 4, μ（MoKoσ） = 2.174 mm^-1, F（000） = 640, R = 0.0259 and wR = 0.0580 for 1787 observed reflections with I 〉 2σ（I）. Complex 1 self-assembls into a quasi-three-dimensional network consisting of adjacent dimers through intermolecular Ag...O weak interactions.展开更多
The title compound, a novel Ag（Ⅰ） carboxyarylphosphonate [Ag（H2BCP）（4,4＇- bipy）]·2H2O （H3BCP = p-H2O3PCH2C6H4COOH, 4,4＇-bipy = 4,4＇-bipyridine）, was synthesized by a hydrothermal reaction and characte...The title compound, a novel Ag（Ⅰ） carboxyarylphosphonate [Ag（H2BCP）（4,4＇- bipy）]·2H2O （H3BCP = p-H2O3PCH2C6H4COOH, 4,4＇-bipy = 4,4＇-bipyridine）, was synthesized by a hydrothermal reaction and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. It belongs to monoclinic system, space group P21/c with a = 5.7038（11）, b = 22.397（4）, c = 5.602（4） , β = 106.26（3）°, V = 1913.4（7） 3, Z = 4, C18H20N2O7PAg, Mr = 515.20, Dc = 1.788 g/cm3, μ = 1.182 mm–1, F（000） = 1040, the final R = 0.0404 and wR = 0.1216 for 4178 observed reflections with I 2σ（Ⅰ）. In the structure, the Ag（Ⅰ） cations are bridged by 4,4＇-bipy to give rise to 1D chains running along the b axis. These chains are linked further by the interactions of O （from BCP ligands） and Ag atoms to yield 2D layers. Hydrogen bonding interactions and weak π-π stacking interactions between 4,4＇-bipy rings assemble such adjacent layers to generate a 3D supramolecular architecture.展开更多
During the last two centuries, there have been many spectacular advances in medical science, the main consequence of which has been the dramatically reduced burden of infectious diseases. While in the 1800s many peopl...During the last two centuries, there have been many spectacular advances in medical science, the main consequence of which has been the dramatically reduced burden of infectious diseases. While in the 1800s many people died before reaching adult- hood, nowadays most people survive. Hence average life ex- pectancy in 1800s was around 30-40, which was barely higher than it had been in Greek and Roman times （Finch, 2010）, but nowadays life expectancy in most modernised economies is around 75 - 80. This demographic shift, which has happened in only 200 years, has created a dramatic change in the causes of mortality. The major killers in the modern world are non- communicable diseases （NCDs）： principally cardiovascular disease, cancer and neurodegenerative disorders such as Alz- heimer＇s disease. A major factor that influences susceptibility to all these diseases is age. As we get older, our risk of developing these NCDs increases enormously. For example, the rate of breast cancer in females at age 15-19 is less than 10 per 100,000 population, but this increases to 100 at age 40-44, 275 at age 55--59 and 450 at age 85 ＋ （http：//www.cancerresearchuk.org/ cancer-info/cancerstats/types/breast/incidence/#age）. Ageing has consequently become a major medical, social and economic burden to many countries.展开更多
The first observation of luminescence from Ag(I)complexes with a square-planar geometry of the metal is reported.[Ag(Py_(3)PO)_(2)]ClO_(4)and[Ag(Py_(3)PO)_(2)]OTf-first examples of the emissive square-planar Ag(I)comp...The first observation of luminescence from Ag(I)complexes with a square-planar geometry of the metal is reported.[Ag(Py_(3)PO)_(2)]ClO_(4)and[Ag(Py_(3)PO)_(2)]OTf-first examples of the emissive square-planar Ag(I)complexes-have been synthesized by the reaction of tris(2-pyridyl)phosphine oxide(Py_(3)PO)with Ag(I)salts.Both complexes exhibit pronounced photoluminescence in the solid state at ambient temperature with nano-and microsecond lifetime components.Remarkably,the luminescence of the complexes has a reversible thermochromic behavior,changing their emission color from yellow(λ_(max)^(em)≈585 nm)at room temperature to red-orange(λ_(max)^(em)=620 nm)at 77 K.The spectroscopic and computational results reveal that the emission of the title compounds can be assigned to the 3MLCT phosphorescence with admixture of the 1MLCT fluorescence.展开更多
A new Ag(I)complex based on tris(2-pyridyl)phosphine(Py_(3)P),[Ag_(2)(Py_(3)P)_(3)(SCN)_(2)],has been synthesized and chemically characterized.Theoretical calculations and photophysical investigations reveal thermally...A new Ag(I)complex based on tris(2-pyridyl)phosphine(Py_(3)P),[Ag_(2)(Py_(3)P)_(3)(SCN)_(2)],has been synthesized and chemically characterized.Theoretical calculations and photophysical investigations reveal thermally activated delayed fluorescence(TADF)coupled with outstanding solvato-and vapor-luminescent behavior.展开更多
With ammonium ions as structure-directing agents,two novel silver thioantimonates (NH_(4))AgSb4S7·H_(2)O (1) and (NH_(4))AgSb2S4 (2) have been surfactant-thermally synthesized and fully characterized. Compound 1 ...With ammonium ions as structure-directing agents,two novel silver thioantimonates (NH_(4))AgSb4S7·H_(2)O (1) and (NH_(4))AgSb2S4 (2) have been surfactant-thermally synthesized and fully characterized. Compound 1 features a three dimensional (3D) open framework while compound 2 possesses a two dimensional (2D) layer structure. The optical band gaps are estimated to be 1.70 eV for 1 and 1.84 eV for 2,exhibiting semiconductor properties for visible light absorption. The photocatalytic experiments demonstrated that both 1 and 2 were able to degrade crystal violet (CV) and rhodamine B (RhB) under visible light irradiation. Moreover,compounds 1 and 2 also displayed selective photocatalytic abilities in CV degradation.展开更多
Oxometallate(MO)-modified Ag clusters have attracted considerable research interest due to their aesthetic structures and fascinating properties.MOs can be a key factor in the organization of Ag ions into a complex en...Oxometallate(MO)-modified Ag clusters have attracted considerable research interest due to their aesthetic structures and fascinating properties.MOs can be a key factor in the organization of Ag ions into a complex entity in an ordered way.Enormous effort has been devoted to exploiting the synthetic strategy of MO–Ag cluster hybrid nanocomposites.Herein,we intend to review the recent progress in the design and construction of MO–Ag clusters with daedal architectures and potential applications.Accordingly,six different types of MO–Ag clusters are summarized mainly in terms of array configurations:(1)MOs@Ag shells;(2)Ag core@MOs;(3)Ag core@MOs@Ag shells;(4)coordination polymers;(5)intercluster compounds and(6)mixed array configurations.Besides,the synergistic effects between MOs and Ag clusters are presented.Based on the current development in this area,this minireview is expected to provide a perspective on controllable preparation of MO–Ag clusters,and a basic understanding of the structure/property correlations of Ag nanoparticle-metal oxide materials,thereby assisting in building functional nanomaterials.展开更多
A novel binuclear Ag（I） complex [Ag2（C6H6NaO）2（C6H7N3O）2]·2CH3CN （1） was synthesized by the evaporation reaction of silver nitrate and （E）-1-（pyrazin-2-yl）ethanone oxime （HL）. The complex was charac...A novel binuclear Ag（I） complex [Ag2（C6H6NaO）2（C6H7N3O）2]·2CH3CN （1） was synthesized by the evaporation reaction of silver nitrate and （E）-1-（pyrazin-2-yl）ethanone oxime （HL）. The complex was characterized by elemental analysis, IR spectrum and X-ray single-crystal diffraction analysis. It crystallizes in the monoclinic space group C2/c with a = 22.7089（3）, b = 11.5443（7）, c = 16.1468（4）/A, β = 127.7150（10）°, V= 3348.6（2） A^3, Dc = 1.675 g/cm^3, Mr = 844.42, Z = 4, F（000） = 1696.0,μ = 1.226 mm^-1, the final R =0.0250 and wR = 0.070. The coordination around the silver（I） atom is a distorted trigonal-bipyramidal geometry involving one protonated pyrazinyl oxime ligand （HL）, one deprotonated oxime ligand （L^-） and one CH3CN solvate molecule in the asymmetric unit of complex 1.展开更多
A new metal-organic coordination polymer, [Ag（L）（NO3）]H （1, L = β-amino-β- （pyrid-2-yl）acrylonitrile）, has been synthesized by solvent method at ambient temperature and characterized through single-crystal d...A new metal-organic coordination polymer, [Ag（L）（NO3）]H （1, L = β-amino-β- （pyrid-2-yl）acrylonitrile）, has been synthesized by solvent method at ambient temperature and characterized through single-crystal diffraction, Fourier transformed infrared spectrum （FTIR）, elemental analysis, thermogravimetry analysis （TGA） and fluorescent measurements. 1 crystallizes in the triclinic system, space group Pi with a = 7.3600（3）, b = 8.5095（17）, c = 9.2936（14） A, α= 66.65（6）, β = 70.56（7）, γ= 71.59（6）°, V = 492.4（4） A3, μ = 2.043 mm-1, Dc = 2.104 Mg/m3, Z = 2, Mr = 312.01, F（000） = 302, the final R = 0.0347 and wR = 0.0987 for 3924 observed reflections with I 〉 2σ（I）.展开更多
The hydrothermal reactions of sodium -hydroxybenzoate with AgNO3 yield a novel stable Ag(I) -complex supramolecular polymer, [Ag2(-HOPhCO2)2]n. The structure of [Ag2(-HOPhCO2)2] was solved by single crystal X-ray diff...The hydrothermal reactions of sodium -hydroxybenzoate with AgNO3 yield a novel stable Ag(I) -complex supramolecular polymer, [Ag2(-HOPhCO2)2]n. The structure of [Ag2(-HOPhCO2)2] was solved by single crystal X-ray diffraction analysis. It is monoclinic with space group P21/c and unit cell parameters a=0.7394(2) nm, b=0.8822(2) nm, c=1.0662(2) nm, =107.66(3)o, Z=4. The silver(I) atom is two-coordinated by two carboxylic oxygen atoms of two -hydroxybenzoate ligands, and meanwhile, forms supramolecular interaction with one carbon atom of phenyl-ring in the third -hydroxybenzoate group. The -form Ag…C supramolecular bond bridges [Ag2(-HOPhCO2)2] units into an infinite 2D layered polymer [Ag2(-HOPhCO2)2]n. The coordination sphere of the silver atom is best described as a distorted T-shaped geometry.展开更多
基金This research was supported by the State Key Laboratory of Structural Chemistry, the National Science and Technology of China (001CB1089), the Chinese Academy of Sciences (CAS), the National Science Foundation of China (20273073, 20333070, 90206040)
文摘Two new complexes, [W2Ag2S8?Ca(DMF)6]n 1 and [WAgS4?Na(DMF)3]n 2, have been synthesized and characterized. Single-crystal X-ray analyses show both 1 and 2 have {WAgS4}n anion linear chains, but 1 has a discrete [Ca(DMF)6]2+ cation while 2 is a linear chain. UV-Visible-Near-IR spectroscopy data show that the bandgaps of the two complexes are 1.86 and 1.99 eV, respectively. Electrical conductivity measurements reveal the conductivities of 1 and 2 are 10?7 and 10?8 Scm?1, respectively and they exhibit thermally activated temperature depen- dence, which may be attributed to semiconductors.
基金National Natural Science Foundation of China(Grants 92061202,21531008 and 21801242)Fujian Science and Technology Project(Grant 2020L3022)Strategic Priority Research Program of Chinese Academy of Sciences(Grant XDB20000000)。
文摘In the present study,2,6-bis(diphenylphosphino)pyridine((Ph_(2)P)_(2)py)-supported cis-and trans-Pt_(2)Ag_(2)alkynyl complexes were prepared and characterized by X-ray crystallography.Although the cis-Pt_(2)Ag_(2)complexes are slightly emissive at ambient conditions,the trans-Pt_(2)Ag_(2)complexes exhibit moderate photoluminescence in dichloromethane and have strong emission in the solid state,originating from aromatic acetylide to(Ph_(2)P)_(2)py ligand-to-ligand charge transfer(^(3)LLCT)and Pt_(2)Ag_(2)cluster metal-centered(^(3)MC)triplet states.Remarkably,the trans-Pt_(2)Ag_(2)complex[Pt_(2)Ag_(2){(Ph_(2)P)_(2)py}_(2)(CuCC_(6)H_(5))_(4)](SO_(3)CF_(3))_(2)exhibit remarkable luminescent vapochromism with emission red-shifts of 100 nm in response to MeCN vapor,arising from intramolecular structural conversion from staggered to parallel arrangements of two face-to-face Pt(CuCC_(6)H_(5))_(2)moieties,which results in the alteration of the excited-state energy in the solid state as supported by TD-DFT studies.
基金supported by the National Natural Science Foundation of China (21573099, 21601077, 21573100)~~
文摘A[H3AgI(H2O)PW11O39]3?‐TiO2/ITO electrode was fabricated by immobilizing a molecular polyoxometalate‐based water oxidation catalyst,[H3AgI(H2O)PW11O39]3?(AgPW11),on a TiO2electrode.The resulting electrode was characterized by X‐ray powder diffraction,scanning electron microscopy,and energy dispersive X‐ray spectroscopy.Linear sweep voltammetry,chronoamperometry,and electrochemical impedance measurements were performed in aqueous Na2SO4solution(0.1molL?1).We found that a higher applied voltage led to better catalytic performance by AgPW11.The AgPW11‐TiO2/ITO electrode gave currents respectively10and2.5times as high as those of the TiO2/ITO and AgNO3‐TiO2/ITO electrodes at an applied voltage of1.5V vs Ag/AgCl.This result was attributed to the lower charge transfer resistance at the electrode‐electrolyte interface for the AgPW11‐TiO2/ITO electrode.Under illumination,the photocurrent was not obviously enhanced although the total anode current increased.The AgPW11‐TiO2/ITO electrode was relatively stable.Cyclic voltammetry of AgPW11was performed in phosphate buffer solution(0.1mol L?1).We found that oxidation of AgPW11was a quasi‐reversible process related to one‐electron and one‐proton transfer.We deduced that disproportionation of the oxidized[H2AgII(H2O)PW11O39]3?might have occurred and the resulting[H3AgIIIOPW11O39]3?oxidized water to O2.
基金supported by the National Natural Science Foundation of China(No.21173197)
文摘Two silver（I）-sulfonate complexes,[Ag（NO3）（4,4＇-bipy）][Ag（HL）（4,4＇-bipy）]·2H2O（1） and[Ag（H2O）（4,4＇-bipy）][AgL（4,4＇-bipy）]·2H2O（2）,have been synthesized by in situ reaction（H2L = 2-formylbenzenesulfonic acid,4,4-bipy = 4,4-bipyridine）.1 displays two parallel 1D chains expending to a 3D supramolecule by n—n interactions and O-H…O hydrogen bonds,in which the[Ag（NO3）]or[Ag（HL）]units are joined by bridging 4,4＇-bipy molecules,respectively.The interactions between the complexes and DNA were studied by means of fluorescence spectra and surface-enhanced Raman scattering（SERS） spectra.The special configuration and intercalation effects between 1 and DNA are stronger than that between 2 and DNA.
基金supported by the National Natural Science Foundation of China (No. 20525101, 20801038)the NSF of the Education Committee of Jiangsu Province (No. 07KJD150182) "Soochow Scholar" Program of Suzhou University
文摘Reaction of AgAc with bzdmpymtH in MeOH resulted in the title compound [Ag（bzdmpymt）]6-2MeOH （1.2MeOH）, which was structurally characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis. 1.2MeOH belongs to the triclinic system, space group Pi, with a = 10.930（2）, b = 11.646（2）, c = 16.794（3）A, a = 103.97（3）, β = 97.07（3）, γ = 97.94（3）°, V = 2027.2（7） A3, Z = 1, μ = 1.629 mm^-1, Dc = 1.710 mg/m3, T = 193（2） K, CsoH86Ag6N12O2S6, Mr = 2087.25, F（000） = 1044, S = 1.034, R = 0.0355 and wR = 0.0709. In 1.2MeOH, six silver（I） atoms are held together by six bzdmpymt ligands through N and S atoms to form a water-wheel-shaped structure. Each Ag atom is coordinated by two S atoms from two bzdmpymt ligands and one N atom from the third bzdmpymt ligand, giving a trigonal planar coordination geometry. Interactions between the CH3 group of bzdmpymt ligand and one pyrimidyl nitrogen atom in an adjacent molecule afford a one-dimensional hydrogen-bonding chain running along the b axis. The luminescent property of 1.2MeOH was also investigated.
基金supported by the National Natural Science Foundation of China(51172232)
文摘A three-coordinate Ag（I） complex, [Ag（Mepzpy）（PAr3）]BF4·H2O（1, Mepzpy = 3-methyl-1-（2-pyridyl）pyrazole, PAr3 = tri（o-tolyl）phosphine）, was synthesized from the reaction of Ag（CH3CN）4BF4, PAr3 and Mepzpy in CH3 CN at room temperature. The compound was characterized by UV-vis, NMR and X-ray single-crystal structure analysis. It crystallizes in triclinic space group P1 with a = 10.2251（5）, b = 10.6014（5）, c = 15.7012（5） A, α = 92.963（3）, β = 92.641（3）, γ = 114.647（4）°, V = 1540.6（1）A 3, Z = 2, Mr = 676.24, Dc = 1.458 g/cm3, F（000） = 688, μ = 6.187 mm^-1, GOOF = 1.038, the final R = 0.0530 and wR = 0.1493 for 6371 observed reflections with I 〉 2σ（I）. Compound 1 is ionic. It is composed of a BF4- anion and a [Ag（Mepzpy）（PAr3）]＋ cation. The Ag（I） ion adopts a distorted trigonal pyramidal coordination geometry defined by two nitrogen atoms and a phosphorous atom. The complex emits blue luminescence with maximum peaks at 470 nm in solid state at room temperature.
基金supported by the Science and Technology Development Project of Jilin Provincial Science&Technology Department(201205080)the Science and Technology Research Projects of the Education Office of Jilin Province(No.2013.384)
文摘Two new complexes [Ag（bix）]n·n NAA·n H2O（1） and [Cd（NAA）（phen）2（H2O）]2· 2CH3COO-·H2O（2）（bix = 1,4-bis（imidazol-1-ylmethyl）benzene,HNAA = α-naphthylacetic acid,phen = 1,10-phenanthroline） have been successfully synthesized under hydrothermal conditions.Their structures have been determined by elemental analyses,IR spectroscopy,TG and single-crystal X-ray diffraction analysis.The intermolecular hydrogen bonding or π-π stacking interactions extend the complexes into a 3D supramolecular structure.Moreover,the luminescent properties of complex 2 have been investigated in the solid state.
基金This work was supported by the Educational Science and Technology Foundation of Henan Province (No. 97150016)
文摘The title complex [(Ag3L2)(ClO4)]n 1, where HL = isonicotinic acid, has been prepared from the reaction of isonicotinic acid with AgClO4?H2O at room temperature and its struc- ture was determined by single-crystal X-ray diffraction. The crystal of 1 is of triclinic, space group P1 with a = 8.429(3), b = 10.694(4), c = 10.840(4) ?, α = 119.063(4), β = 100.474(5), γ = 99.901(5)°, V = 800.4(5) ?3, Mr = 1334.53, Dc = 2.769 g/cm3, Z = 2, μ(MoKα) = 3.848 mm-1, F(000) = 632, R = 0.0250 and wR = 0.0582 for 2872 observed reflections with I > 2σ(I). Complex 1 is a two-dimensional network consisting of adjacent one-dimensional chains through Ag–Ag inter- actions.
基金This work was supported by the Outstanding Young Foundation of Henan Province
文摘The supramolecular compound [(AgI3)(4-HBPFA)2(H2O)] (Mr = 1361.11) was synthesized via the reaction of 1,1?-bis[(4-pyridylamino)carbonyl]ferrocene (4-BPFA) with AgI, and structurally characterized by single-crystal X-ray diffraction analysis. Crystal data: monoclinic, space group C2/c, a = 1.6783(3), b = 10.646(2), c = 2.5419(5) ?, β = 93.66(3)o, V = 4532.2(16) ?3, Z = 4, Dc = 1.995 g/cm3, F(000) = 2632 and μ = 3.158 mm-1. The compound consists of (4- HBPFA)+, (AgI3)2- and H2O. In the structure, the adjacent (4-HBPFA)+ are linked by C–H…O and N–H…N hydrogen bonds into 1-D chains which are further linked by C–H…I and N–H…I hydrogen bonds as well as intermolecular π-π stacking interactions to form a 3-D supramolecular compound.
基金This work was supported by the National Natural Science Foundation of China (No. 20331010) and Natural Science Foundation (No.033602011) of Tianjin
文摘A novel complex [Ag(NIT3Py)3]?(ClO4)(H2O) has been synthesized and structurally characterized by X-ray diffraction method. It crystallizes in the rhombohedral system, space group R 3 with a = 15.8227(17), b = 15.8227(17), c = 31.445(3) ?, γ = 120°, V = 6817.8(12) ?3, Dc = 1.370 g/cm3, Z = 6, μ = 0.566 mm-1, Mr = 937.18, F(000) = 2916, R = 0.0715, wR = 0.2115 and GOF = 1.086. The structure consists of Ag(NIT3Py)3+ cation moiety, one water molecule and one perchloric ion. The Ag(I) ion is in a trigonal planar coordination environment formed by three nitrogen atoms from three NIT3Py ligand molecules.
文摘The title complex [AgL（NO3）]2 1, where L = 2-acetamido-5-methyl-1,3,4-thiadiazole, was prepared from the reaction of 2-acetamido-5-methyl-1,3,4-thiadiazole with AgNO3 at room temperature and its structure has been determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P2t/c with a = 12.5454（8）, b = 11.9672（12）, c = 6.8925（6） A, β = 98.468（2）°. V= 1023.51（15） A^3, Mr= 3127.08, Dc = 2.123 g/cm^3, Z= 4, μ（MoKoσ） = 2.174 mm^-1, F（000） = 640, R = 0.0259 and wR = 0.0580 for 1787 observed reflections with I 〉 2σ（I）. Complex 1 self-assembls into a quasi-three-dimensional network consisting of adjacent dimers through intermolecular Ag...O weak interactions.
基金supported by the National Natural Science Foundation of China (No. 20873021)the State Key Laboratory of Structural Chemistry and the Young Talent Programmed of Fujian Province (No. 2006F3072)
文摘The title compound, a novel Ag（Ⅰ） carboxyarylphosphonate [Ag（H2BCP）（4,4＇- bipy）]·2H2O （H3BCP = p-H2O3PCH2C6H4COOH, 4,4＇-bipy = 4,4＇-bipyridine）, was synthesized by a hydrothermal reaction and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. It belongs to monoclinic system, space group P21/c with a = 5.7038（11）, b = 22.397（4）, c = 5.602（4） , β = 106.26（3）°, V = 1913.4（7） 3, Z = 4, C18H20N2O7PAg, Mr = 515.20, Dc = 1.788 g/cm3, μ = 1.182 mm–1, F（000） = 1040, the final R = 0.0404 and wR = 0.1216 for 4178 observed reflections with I 2σ（Ⅰ）. In the structure, the Ag（Ⅰ） cations are bridged by 4,4＇-bipy to give rise to 1D chains running along the b axis. These chains are linked further by the interactions of O （from BCP ligands） and Ag atoms to yield 2D layers. Hydrogen bonding interactions and weak π-π stacking interactions between 4,4＇-bipy rings assemble such adjacent layers to generate a 3D supramolecular architecture.
文摘During the last two centuries, there have been many spectacular advances in medical science, the main consequence of which has been the dramatically reduced burden of infectious diseases. While in the 1800s many people died before reaching adult- hood, nowadays most people survive. Hence average life ex- pectancy in 1800s was around 30-40, which was barely higher than it had been in Greek and Roman times （Finch, 2010）, but nowadays life expectancy in most modernised economies is around 75 - 80. This demographic shift, which has happened in only 200 years, has created a dramatic change in the causes of mortality. The major killers in the modern world are non- communicable diseases （NCDs）： principally cardiovascular disease, cancer and neurodegenerative disorders such as Alz- heimer＇s disease. A major factor that influences susceptibility to all these diseases is age. As we get older, our risk of developing these NCDs increases enormously. For example, the rate of breast cancer in females at age 15-19 is less than 10 per 100,000 population, but this increases to 100 at age 40-44, 275 at age 55--59 and 450 at age 85 ＋ （http：//www.cancerresearchuk.org/ cancer-info/cancerstats/types/breast/incidence/#age）. Ageing has consequently become a major medical, social and economic burden to many countries.
基金supported by the Russian Science Foundation(Project 18-73-10086).The part of photophysical measurements was carried out in the Centre for Optical and Laser Materials Research of Saint Petersburg State University Research Park.The authors are grateful to the Multi-Access Chemical Service Center SB RAS for single crystal XRD analysis.
文摘The first observation of luminescence from Ag(I)complexes with a square-planar geometry of the metal is reported.[Ag(Py_(3)PO)_(2)]ClO_(4)and[Ag(Py_(3)PO)_(2)]OTf-first examples of the emissive square-planar Ag(I)complexes-have been synthesized by the reaction of tris(2-pyridyl)phosphine oxide(Py_(3)PO)with Ag(I)salts.Both complexes exhibit pronounced photoluminescence in the solid state at ambient temperature with nano-and microsecond lifetime components.Remarkably,the luminescence of the complexes has a reversible thermochromic behavior,changing their emission color from yellow(λ_(max)^(em)≈585 nm)at room temperature to red-orange(λ_(max)^(em)=620 nm)at 77 K.The spectroscopic and computational results reveal that the emission of the title compounds can be assigned to the 3MLCT phosphorescence with admixture of the 1MLCT fluorescence.
基金supported by Russian Science Foundation(Project 18-73-10086).
文摘A new Ag(I)complex based on tris(2-pyridyl)phosphine(Py_(3)P),[Ag_(2)(Py_(3)P)_(3)(SCN)_(2)],has been synthesized and chemically characterized.Theoretical calculations and photophysical investigations reveal thermally activated delayed fluorescence(TADF)coupled with outstanding solvato-and vapor-luminescent behavior.
基金support from AcRF Tier 1(474,RG133/14 and RG 13/15)from MOE,Singapore.
文摘With ammonium ions as structure-directing agents,two novel silver thioantimonates (NH_(4))AgSb4S7·H_(2)O (1) and (NH_(4))AgSb2S4 (2) have been surfactant-thermally synthesized and fully characterized. Compound 1 features a three dimensional (3D) open framework while compound 2 possesses a two dimensional (2D) layer structure. The optical band gaps are estimated to be 1.70 eV for 1 and 1.84 eV for 2,exhibiting semiconductor properties for visible light absorption. The photocatalytic experiments demonstrated that both 1 and 2 were able to degrade crystal violet (CV) and rhodamine B (RhB) under visible light irradiation. Moreover,compounds 1 and 2 also displayed selective photocatalytic abilities in CV degradation.
基金supported by the National Natural Science Foundation of China(22201038,22101048,21971038,22271046 and 21975044)the Fujian Provincial Department of Science and Technology(2019H6012,21019L3004 and 2022J05040).
文摘Oxometallate(MO)-modified Ag clusters have attracted considerable research interest due to their aesthetic structures and fascinating properties.MOs can be a key factor in the organization of Ag ions into a complex entity in an ordered way.Enormous effort has been devoted to exploiting the synthetic strategy of MO–Ag cluster hybrid nanocomposites.Herein,we intend to review the recent progress in the design and construction of MO–Ag clusters with daedal architectures and potential applications.Accordingly,six different types of MO–Ag clusters are summarized mainly in terms of array configurations:(1)MOs@Ag shells;(2)Ag core@MOs;(3)Ag core@MOs@Ag shells;(4)coordination polymers;(5)intercluster compounds and(6)mixed array configurations.Besides,the synergistic effects between MOs and Ag clusters are presented.Based on the current development in this area,this minireview is expected to provide a perspective on controllable preparation of MO–Ag clusters,and a basic understanding of the structure/property correlations of Ag nanoparticle-metal oxide materials,thereby assisting in building functional nanomaterials.
基金supported by the National Natural Science Foundation of China (20871099)the Natural Science Foundation of Gansu Province (0710RJZA113)
文摘A novel binuclear Ag（I） complex [Ag2（C6H6NaO）2（C6H7N3O）2]·2CH3CN （1） was synthesized by the evaporation reaction of silver nitrate and （E）-1-（pyrazin-2-yl）ethanone oxime （HL）. The complex was characterized by elemental analysis, IR spectrum and X-ray single-crystal diffraction analysis. It crystallizes in the monoclinic space group C2/c with a = 22.7089（3）, b = 11.5443（7）, c = 16.1468（4）/A, β = 127.7150（10）°, V= 3348.6（2） A^3, Dc = 1.675 g/cm^3, Mr = 844.42, Z = 4, F（000） = 1696.0,μ = 1.226 mm^-1, the final R =0.0250 and wR = 0.070. The coordination around the silver（I） atom is a distorted trigonal-bipyramidal geometry involving one protonated pyrazinyl oxime ligand （HL）, one deprotonated oxime ligand （L^-） and one CH3CN solvate molecule in the asymmetric unit of complex 1.
基金supported by the Natural Science Foundation of Fujian Province(2012J06006,2006L2005)
文摘A new metal-organic coordination polymer, [Ag（L）（NO3）]H （1, L = β-amino-β- （pyrid-2-yl）acrylonitrile）, has been synthesized by solvent method at ambient temperature and characterized through single-crystal diffraction, Fourier transformed infrared spectrum （FTIR）, elemental analysis, thermogravimetry analysis （TGA） and fluorescent measurements. 1 crystallizes in the triclinic system, space group Pi with a = 7.3600（3）, b = 8.5095（17）, c = 9.2936（14） A, α= 66.65（6）, β = 70.56（7）, γ= 71.59（6）°, V = 492.4（4） A3, μ = 2.043 mm-1, Dc = 2.104 Mg/m3, Z = 2, Mr = 312.01, F（000） = 302, the final R = 0.0347 and wR = 0.0987 for 3924 observed reflections with I 〉 2σ（I）.
基金Project supported by the Natural Science Foundation of Shandong Province (No. Y2002B06).
文摘The hydrothermal reactions of sodium -hydroxybenzoate with AgNO3 yield a novel stable Ag(I) -complex supramolecular polymer, [Ag2(-HOPhCO2)2]n. The structure of [Ag2(-HOPhCO2)2] was solved by single crystal X-ray diffraction analysis. It is monoclinic with space group P21/c and unit cell parameters a=0.7394(2) nm, b=0.8822(2) nm, c=1.0662(2) nm, =107.66(3)o, Z=4. The silver(I) atom is two-coordinated by two carboxylic oxygen atoms of two -hydroxybenzoate ligands, and meanwhile, forms supramolecular interaction with one carbon atom of phenyl-ring in the third -hydroxybenzoate group. The -form Ag…C supramolecular bond bridges [Ag2(-HOPhCO2)2] units into an infinite 2D layered polymer [Ag2(-HOPhCO2)2]n. The coordination sphere of the silver atom is best described as a distorted T-shaped geometry.
