Methanol synthesis from hydrogenation of CO2 is investigated over Cu/ZnO/Al2O3 catalysts prepared by decomposition of M（Cu,Zn）-ammonia complexes （DMAC） at various temperatures.The catalysts were characterized in d...Methanol synthesis from hydrogenation of CO2 is investigated over Cu/ZnO/Al2O3 catalysts prepared by decomposition of M（Cu,Zn）-ammonia complexes （DMAC） at various temperatures.The catalysts were characterized in detail,including X-ray diffraction,N2 adsorption-desorption,N2O chemisorption,temperature-programmed reduction and evolved gas analyses.The influences of DMAC temperature,reaction temperature and specific Cu surface area on catalytic performance are investigated.It is considered that the aurichalcite phase in the precursor plays a key role in improving the physiochemical properties and activities of the final catalysts.The catalyst from rich-aurichalcite precursor exhibits large specific Cu surface area and high space time yield of methanol （212 g/（Lcat·h）;T=513 K,p=3MPa,SV=12000 h-1）.展开更多
The X-ray crystal structure of [(dtma)ZnImZn(dtma)]ClO_4·2.5H_2O (Hdtma=4-Diethyl- enetriamineacetic acid) was determined.The crystal is of orthorhombic,space group Pbcn with a- 14.104(5),b=14.897(5),c=25.384(9),...The X-ray crystal structure of [(dtma)ZnImZn(dtma)]ClO_4·2.5H_2O (Hdtma=4-Diethyl- enetriamineacetic acid) was determined.The crystal is of orthorhombic,space group Pbcn with a- 14.104(5),b=14.897(5),c=25.384(9),and Z=8.The least-square refinement of the structure leads to conventional R factor of 0.066.The magnetic properties of [(dtma)CulmZn(dtma)]CIO_4·2.5H_2O were investigated.From the single crystal ESR spectra of Zn—Im—Zn dimer doped with Cu—Im—Zn complex,the anisotropic g and A tensors and electronic spin-density of the Cu—Zn complex are obtained and the bonding nature of Cu is discussed.展开更多
A mixed complex [Zn（C5H6N2）（HL）2] （C5H6N2 = 2-aminopyridine, H2L = acetylacetone） has been synthesized and characterized by IR, elemental analysis and X-ray single-crystal diffraction analysis. The crystal belon...A mixed complex [Zn（C5H6N2）（HL）2] （C5H6N2 = 2-aminopyridine, H2L = acetylacetone） has been synthesized and characterized by IR, elemental analysis and X-ray single-crystal diffraction analysis. The crystal belongs to monoclinic, space group P21/c with a = 7.4490（15）, b = 8.2650（17）, c = 27.615（6） A°, β= 101.69（3）°, V = 1664.9（6）A°^3, Z = 4, Mr = 357.70, Dc = 1.427 g/cm^3, F（000） = 744, μ = 1.493 mm^-1, R = 0.0309 and wR = 0.0771. The Zn（Ⅱ） is coordinated by one nitrogen atom from 2-aminopyridine and four oxygen atoms from two acetylacetone anions to furnish a distorted square pyramid geometry. The complex forms a three-dimensional network through intermolecular hydrogen bonds.展开更多
A new complex [Zn（NIT-1′-MeBzlm）Cl2（H2O）] （NIT-1′-MeBzlm = 2-{2′-[（1′- methyl）benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide） has been prepared and structurally characterized by X-ray diffr...A new complex [Zn（NIT-1′-MeBzlm）Cl2（H2O）] （NIT-1′-MeBzlm = 2-{2′-[（1′- methyl）benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide） has been prepared and structurally characterized by X-ray diffraction method. Crystal data： monoclinic, space group P21/n, Z = 4, C15H21Cl2N4O3Zn, Mr = 441.63, a = 7.2225（10）, b = 30.849（4）, c = 8.8758（13）A, β = 103.904（2）°, V = 1919.6（5）A^3, Dc = 1.528 g/cm^3, μ（MoKα） = 1.579 mm^-1, F（000） = 908, R = 0.0436 and wR = 0.1029 for 2456 observed reflections with I〉 2σ（I）. X-ray analysis reveals that the Zn（Ⅱ） ion is four-coordinated with a distorted tetrahedron. There also exist H-bonds, π-π piling interactions and weak intermolecular contacts between the NO groups which form a mutual stagger 3-D network configuration. Magnetic investigation reveals that there exists intermolecular antiferro- and ferromagnetic interactions in the title complex.展开更多
A novel Zn（Ⅱ） complex, [ZnL2（H2O）4]·H2O（1, HL = 2-（nicotinoyloxy）acetic acid）, was synthesized using Zn（OAc）2·2H2O and 2-（nicotinoyloxy）acetic acid as raw materials. Its structure has been eluci...A novel Zn（Ⅱ） complex, [ZnL2（H2O）4]·H2O（1, HL = 2-（nicotinoyloxy）acetic acid）, was synthesized using Zn（OAc）2·2H2O and 2-（nicotinoyloxy）acetic acid as raw materials. Its structure has been elucidated by elemental analysis, IR and single-crystal X-ray diffraction. The structural analysis revealed that complex 1 crystallizes in triclinic, space group P1 and the Zn（Ⅱ） atom is six-coordinated with two N atoms from two different 2-（nicotinoyloxy）acetate anion ligands and four O atoms from coordinated water molecules. Complex 1 forms a 3D network structure by O–H···O hydrogen bonds. The antitumor activities of 2-（nicotinoyloxy）acetic acid ligand and its Zn（Ⅱ） complex were evaluated against human lung adenocarcinoma A549 cells, human hepatoma SMMC-7721 cells and human colon carcinoma Wi Dr cells.展开更多
Three novel Zn（II） complexes,[Zn4L1Cl4]-3H2O（1）,[Zn4L2Cl4]-2DMF（2） and[Zn4L^3Cl4]H2O（3）,have been synthesized and structurally characterized.In these complexes,interesting 32-membered dodecadentate macrocyclic...Three novel Zn（II） complexes,[Zn4L1Cl4]-3H2O（1）,[Zn4L2Cl4]-2DMF（2） and[Zn4L^3Cl4]H2O（3）,have been synthesized and structurally characterized.In these complexes,interesting 32-membered dodecadentate macrocyclic ligands were generated in situ by ＇2 ＋ 2＇ type condensation reactions between a tetraamine and various dialdehydes.All the complexes are isostructurally tetranuclear Zn（Ⅱ） complexes,containing endogenous alkoxo and phenoxo bridges.Applications of the macrocyclic ligands as Zn^2＋ sensors have been investigated.Take H4L^1 for example,it exhibits a 4-fold fluorescence enhancement upon the addition of 2 equiv.of Zn^2＋ in MeOH.展开更多
A new Zn（Ⅱ） complex, [Zn（L）2（phen）（H2O）]（1, HL = N-acetyl-L-phenylalanine, phen = 1,10-phenanthroline） has been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction a...A new Zn（Ⅱ） complex, [Zn（L）2（phen）（H2O）]（1, HL = N-acetyl-L-phenylalanine, phen = 1,10-phenanthroline） has been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction analysis. The Zn（Ⅱ） complex belongs to monoclinic, space group P21 with a = 12.6749（13）, b = 5.5965（6）, c = 22.985（2） A, β = 104.296（2）°, V = 1580.0（3） A^3, Z = 2, Mr = 676.02, Dc = 1.421 μg·m^（-3）, μ = 0.833 mm^-1, F（000） = 704, and the final R = 0.0460, wR = 0.0899 for 4422 observed reflections with I 〉 2σ（I）. The molecules form a 1D chained structure by hydrogen bonds. The antitumor activities of Zn（Ⅱ） complex against human hepatoma SMMC-7721 cells, human lung adenocarcinoma A549 cells and human colon carcinoma WiDr cells have also been investigated.展开更多
The thermal decomposition reaction of the [Zn(NFA)_2(NO_3)_2]·2H_2O(NFA=C_ 16H_ 18FN_3O_3,norfloxacin) was studied in a static atmosphere using TG-DTG and DTA methods. The thermal decomposition processes of the...The thermal decomposition reaction of the [Zn(NFA)_2(NO_3)_2]·2H_2O(NFA=C_ 16H_ 18FN_3O_3,norfloxacin) was studied in a static atmosphere using TG-DTG and DTA methods. The thermal decomposition processes of the complex were determined and its kinetics was investigated. The kinetic parameters were obtained from analysis of the TG-DTG curves by differential and integral methods. The most pro- bable mechanism for the second stage was suggested by comparision of the kinetic parameters.展开更多
The electrospray ionization mass spectrometry investigation showed that the binding sites of [ZnL]^2＋, where L is 2-[bis（2- aminoethyl）amino]ethanol, with oxidized insulin B chain are Phel, His5 and Arg22, which le...The electrospray ionization mass spectrometry investigation showed that the binding sites of [ZnL]^2＋, where L is 2-[bis（2- aminoethyl）amino]ethanol, with oxidized insulin B chain are Phel, His5 and Arg22, which lead to the selective cleavages of the peptide bonds at Phe1-Val2, His5-Leu6, Glu21-Arg22, and Arg22-Gly23 of oxidized insulin B chain.展开更多
A new Zn（Ⅱ） complex, [Zn（L）2（H2O）2], where H2L = N-（2-hydroxy-1-naphthyli- dene）-L-sedne, has been synthesized and characterized by single-crystal X-ray diffraction. The crystal belongs to monoclinic system, ...A new Zn（Ⅱ） complex, [Zn（L）2（H2O）2], where H2L = N-（2-hydroxy-1-naphthyli- dene）-L-sedne, has been synthesized and characterized by single-crystal X-ray diffraction. The crystal belongs to monoclinic system, space group C2/c with a = 13.669（2）, b = 6.4657（9）, c = 31.463（5） A, β = 98.010（2）°, V = 2753.6（7） A^3, Z = 8, Mr = 358.64, Dc = 1.730 g/cm^3, F（000） = 1472,μ（MoKa） = 1.814 mm^-1, the final R = 0.0355 and wR = 0.0706. The Zn（Ⅱ） atom adopts a square-pyramidal geometry coordinated by the tridentate ligand and two water molecules. Intermolecular hydrogen bonds link the complex molecules into a two-dimensional layer.展开更多
A new Zn（II） complex, [ZnL2Br2] （L = triadimenol） was synthesized by the reaction of ZnBr2 with the commercial fungicide of triadimenol, then characterized by elemental analysis, IR spectroscopy and single-crystal...A new Zn（II） complex, [ZnL2Br2] （L = triadimenol） was synthesized by the reaction of ZnBr2 with the commercial fungicide of triadimenol, then characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The crystal structure shows that the complex [ZnL2Br2] crystallizes in orthorhombic, Pnam space group with a = 11.263（2）, b = 8.4478（15）, c = 36.125 （7） A, V = 3437.2 （11 ） ,A Z = 4, C28H36Br2C12N604Zn, Mr = 816.72, Dc = 1.578 g/cm3, F（000） = 1648,μ = 3.236 mm-1, the final R = 0.0388 and wR = 0.0879 for 2399 observed reflections with I 〉 2σ（/）. The central metals adopt square plane coordination geometry. And intermolecular hydrogen bonds connect Zn（Ⅱ） into a one-dimensional chain. In addition, the title complex and triadimenol were screened for antifungal activities against four selected fungi using the mycelial growth rate method. The results indicate that the complex synthesized shows better antifungal activities than the ligand triadimenol.展开更多
The title compound {[Zn（NIT4Py）（fum）（HEO）2]·H2O}n, where NIT4Py = 2-（4＇- pyridinyl）-4,4,5,5-tetra-methylimidazoline-looxyl-3-oxide and fum = fumarate, has been prepared and structurally characterized by ...The title compound {[Zn（NIT4Py）（fum）（HEO）2]·H2O}n, where NIT4Py = 2-（4＇- pyridinyl）-4,4,5,5-tetra-methylimidazoline-looxyl-3-oxide and fum = fumarate, has been prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic, space group P1^- with a = 6.9533（9）, b = 9.805（1）, c = 15.248（2） A, α= 94.608（2）, β = 92.328（2）, γ = 105.840（2）°, C16H24N3O9Zn, Mr = 467.75, V = 994.8（2） A^3, Z = 2, Dc = 1.562 g/cm^3,μ（MoKα） = 1.289 mm^-1, F（000） = 486, the final R = 0.0243 and wR = 0.0622 for 3505 independent reflections with Rint = 0.0125. The Zn（II） adopts a distorted five-coordinate triangle bipyramidal geometry. The basic framework structure of the complex is a 1-D chain. The intrachain hydrogen bonds are helpful to stabilize the 1-D chain structure. Furthermore, the chains are connected by O-H…O hydrogen bonds to give a 2-D double-layer network.展开更多
Solvatochromic materials have recently attracted increasing attention owing to their great significance in the security and sensor fields.In this study,ultrafast explicit and implicit information was collected regardi...Solvatochromic materials have recently attracted increasing attention owing to their great significance in the security and sensor fields.In this study,ultrafast explicit and implicit information was collected regarding a fluorescent nanocellulose membrane produced from nanocellulose membranes coated with a Zn-terpyridine complex(Zn-tpy)in a layer-by-layer manner.The fluorescent emissions of the nanocellulose membrane changed from yellow(CIE:x=0.37,y=0.45)to green(CIE:x=0.32,y=0.47)under a dichloromethane environment and 365-nm irradiation.Due to the ease of dichloromethane volatilization,fluorescent emissions quickly returned to the original state.These solvatochromic nanocellulose membranes,with ultrafast explicit and implicit information,exhibited valuable application prospects in anti-counterfeiting techniques.展开更多
The title compound [Zn(Him2Py)(N3)2]2 (Zn2C26H38N18O2, Mr = 765.48) has been prepared and structurally characterized by X-ray diffraction methods. It crystallizes in monoclinic, space group P21/n with a = 10.989(3), b...The title compound [Zn(Him2Py)(N3)2]2 (Zn2C26H38N18O2, Mr = 765.48) has been prepared and structurally characterized by X-ray diffraction methods. It crystallizes in monoclinic, space group P21/n with a = 10.989(3), b = 11.519(3), c = 13.812(4) ? b = 101.700(5), V = 1711.9(9) ?, Z = 2, Dc = 1.485 g/cm3, m(MoKa) = 1.456 mm～1, F(000) = 792, the final R = 0.0401 and wR = 0.0861 for 2054 observed reflections with I>2s(I). The imino nitroxide 2-(3- methyl-2-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl (im2Py) was reduced to obtain 2-(3-methyl -2-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-ydroxy (Him2Py) coordinating to the zinc (II) ion, around which the coordination geometry is a square-based pyramid with a terminal nitrogen atom located at the apical position. The four basal sites are occupied by two m1,1 nitrogen atoms from two different bridging azide ions and two nitrogen atoms from Him2Py. The units of [Zn(Him2Py)(N3)2]2 were connected as two dimension planes by intermolecular hydrogen bonds.展开更多
There are many reports that divalent alkaline earth, first-row transition metals, and Zn(II) ions have α-glucosidase inhibitory effects. Cu(II) and Zn(II) ions, in particular, have strong α-glucosidase inhibitory ef...There are many reports that divalent alkaline earth, first-row transition metals, and Zn(II) ions have α-glucosidase inhibitory effects. Cu(II) and Zn(II) ions, in particular, have strong α-glucosidase inhibitory effects. Several Schiff bases also display α-glucosidase inhibitory effects. In this study, we focused on safe and highly effective complexes including Zn(II) ion. We prepared and characterized the Zn(II) complexes with four different Schiff bases (N-salicylidene-β-alanine (N-sβ), N-N’-bis (salicylidene) ethylenediamine (N-bsE), N, N’-bis (salicylidene)-phenylenediamine (N-bsP), and 1-[(2-dimethylaminoethylimino) methyl]naphtholate (DMN)) and investigated their α-glucosidase inhibitory effects in vitro, using α-glycosidases from Saccharomyces sp. and rat small intestine, and in vivo, using a sucrose tolerance test. The Zn(II) complexes with DMN showed the highest in vitro and in vivo α-glucosidase inhibitory effects in this study.展开更多
A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constant...A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm^(-3)(KNO_3).The com- puter programs SUPERQUAD were applied for data treatment with satisfactory results.展开更多
A new mixed complex [Zn(tren) (H-SSA)] was synthesized based on the reaction of ZnO,5-sulfosalicylic acid and tren in water-methanol mixed solvents where tren was tris(2-aminoethyl)amine for the first time. The struct...A new mixed complex [Zn(tren) (H-SSA)] was synthesized based on the reaction of ZnO,5-sulfosalicylic acid and tren in water-methanol mixed solvents where tren was tris(2-aminoethyl)amine for the first time. The structure of the mixed complex was characterized by elemental analysis, IR, 1H NMR and thermal analysis. The crystal structure of the complex was also determined by X-ray single crystal diffraction. Its crystal belongs to trigonal system with space group P31, a=1.109 67(18) nm, b=1.109 67(18) nm, c=1.236 8(4) nm, V=1.318 9(5) nm3; Dc=1.616 g·cm-3; Z=3; F(000)=666; μ=1.553 mm-1. CCDC: 253908.展开更多
基金supported by the National Basic Research Program of China (No. 2011CB201404)the financial support of the State Key Laboratory for Oxo Synthesis and Selective Oxidation (OSSO) of China
文摘Methanol synthesis from hydrogenation of CO2 is investigated over Cu/ZnO/Al2O3 catalysts prepared by decomposition of M（Cu,Zn）-ammonia complexes （DMAC） at various temperatures.The catalysts were characterized in detail,including X-ray diffraction,N2 adsorption-desorption,N2O chemisorption,temperature-programmed reduction and evolved gas analyses.The influences of DMAC temperature,reaction temperature and specific Cu surface area on catalytic performance are investigated.It is considered that the aurichalcite phase in the precursor plays a key role in improving the physiochemical properties and activities of the final catalysts.The catalyst from rich-aurichalcite precursor exhibits large specific Cu surface area and high space time yield of methanol （212 g/（Lcat·h）;T=513 K,p=3MPa,SV=12000 h-1）.
文摘The X-ray crystal structure of [(dtma)ZnImZn(dtma)]ClO_4·2.5H_2O (Hdtma=4-Diethyl- enetriamineacetic acid) was determined.The crystal is of orthorhombic,space group Pbcn with a- 14.104(5),b=14.897(5),c=25.384(9),and Z=8.The least-square refinement of the structure leads to conventional R factor of 0.066.The magnetic properties of [(dtma)CulmZn(dtma)]CIO_4·2.5H_2O were investigated.From the single crystal ESR spectra of Zn—Im—Zn dimer doped with Cu—Im—Zn complex,the anisotropic g and A tensors and electronic spin-density of the Cu—Zn complex are obtained and the bonding nature of Cu is discussed.
基金This work was supported by Qingdao Science and Technology Plan Items (03-3-nsh-28)
文摘A mixed complex [Zn（C5H6N2）（HL）2] （C5H6N2 = 2-aminopyridine, H2L = acetylacetone） has been synthesized and characterized by IR, elemental analysis and X-ray single-crystal diffraction analysis. The crystal belongs to monoclinic, space group P21/c with a = 7.4490（15）, b = 8.2650（17）, c = 27.615（6） A°, β= 101.69（3）°, V = 1664.9（6）A°^3, Z = 4, Mr = 357.70, Dc = 1.427 g/cm^3, F（000） = 744, μ = 1.493 mm^-1, R = 0.0309 and wR = 0.0771. The Zn（Ⅱ） is coordinated by one nitrogen atom from 2-aminopyridine and four oxygen atoms from two acetylacetone anions to furnish a distorted square pyramid geometry. The complex forms a three-dimensional network through intermolecular hydrogen bonds.
基金supported by the National Natural Science Foundation of China (Nos. 20471026 and 20771054)the Henan Tackle Key Problem of Science and Technology (No. 0524220001)
文摘A new complex [Zn（NIT-1′-MeBzlm）Cl2（H2O）] （NIT-1′-MeBzlm = 2-{2′-[（1′- methyl）benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide） has been prepared and structurally characterized by X-ray diffraction method. Crystal data： monoclinic, space group P21/n, Z = 4, C15H21Cl2N4O3Zn, Mr = 441.63, a = 7.2225（10）, b = 30.849（4）, c = 8.8758（13）A, β = 103.904（2）°, V = 1919.6（5）A^3, Dc = 1.528 g/cm^3, μ（MoKα） = 1.579 mm^-1, F（000） = 908, R = 0.0436 and wR = 0.1029 for 2456 observed reflections with I〉 2σ（I）. X-ray analysis reveals that the Zn（Ⅱ） ion is four-coordinated with a distorted tetrahedron. There also exist H-bonds, π-π piling interactions and weak intermolecular contacts between the NO groups which form a mutual stagger 3-D network configuration. Magnetic investigation reveals that there exists intermolecular antiferro- and ferromagnetic interactions in the title complex.
基金supported by the National Natural Science Foundation of China(No.21171132)the Project of Shandong Province Higher Educational Science and Technology Program(J14LC01)Science Foundation of Weifang
文摘A novel Zn（Ⅱ） complex, [ZnL2（H2O）4]·H2O（1, HL = 2-（nicotinoyloxy）acetic acid）, was synthesized using Zn（OAc）2·2H2O and 2-（nicotinoyloxy）acetic acid as raw materials. Its structure has been elucidated by elemental analysis, IR and single-crystal X-ray diffraction. The structural analysis revealed that complex 1 crystallizes in triclinic, space group P1 and the Zn（Ⅱ） atom is six-coordinated with two N atoms from two different 2-（nicotinoyloxy）acetate anion ligands and four O atoms from coordinated water molecules. Complex 1 forms a 3D network structure by O–H···O hydrogen bonds. The antitumor activities of 2-（nicotinoyloxy）acetic acid ligand and its Zn（Ⅱ） complex were evaluated against human lung adenocarcinoma A549 cells, human hepatoma SMMC-7721 cells and human colon carcinoma Wi Dr cells.
基金financially supported by NSFC,the Program for Professor of Special Appointment(Eastern Scholar) at Shanghai Institutions of Higher Learning,Program for New Century Excellent Talents in University(No.NCET-11-0638)Innovation Program of Shanghai Municipal Education Commission,the Fundamental Research Funds for the Central Universities(No.WK1013002)+1 种基金SRFDP(No.20100074110015)S.W.Ng is grateful for support by the University of Malaya(No.UM.C/625/1/H1R/033/10)
文摘Three novel Zn（II） complexes,[Zn4L1Cl4]-3H2O（1）,[Zn4L2Cl4]-2DMF（2） and[Zn4L^3Cl4]H2O（3）,have been synthesized and structurally characterized.In these complexes,interesting 32-membered dodecadentate macrocyclic ligands were generated in situ by ＇2 ＋ 2＇ type condensation reactions between a tetraamine and various dialdehydes.All the complexes are isostructurally tetranuclear Zn（Ⅱ） complexes,containing endogenous alkoxo and phenoxo bridges.Applications of the macrocyclic ligands as Zn^2＋ sensors have been investigated.Take H4L^1 for example,it exhibits a 4-fold fluorescence enhancement upon the addition of 2 equiv.of Zn^2＋ in MeOH.
基金supported by the National Natural Science Foundation of China(No.21171132)the Project of Shandong Province Higher Educational Science and Technology Program(J14LC01)Science Foundation of Weifang
文摘A new Zn（Ⅱ） complex, [Zn（L）2（phen）（H2O）]（1, HL = N-acetyl-L-phenylalanine, phen = 1,10-phenanthroline） has been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction analysis. The Zn（Ⅱ） complex belongs to monoclinic, space group P21 with a = 12.6749（13）, b = 5.5965（6）, c = 22.985（2） A, β = 104.296（2）°, V = 1580.0（3） A^3, Z = 2, Mr = 676.02, Dc = 1.421 μg·m^（-3）, μ = 0.833 mm^-1, F（000） = 704, and the final R = 0.0460, wR = 0.0899 for 4422 observed reflections with I 〉 2σ（I）. The molecules form a 1D chained structure by hydrogen bonds. The antitumor activities of Zn（Ⅱ） complex against human hepatoma SMMC-7721 cells, human lung adenocarcinoma A549 cells and human colon carcinoma WiDr cells have also been investigated.
文摘The thermal decomposition reaction of the [Zn(NFA)_2(NO_3)_2]·2H_2O(NFA=C_ 16H_ 18FN_3O_3,norfloxacin) was studied in a static atmosphere using TG-DTG and DTA methods. The thermal decomposition processes of the complex were determined and its kinetics was investigated. The kinetic parameters were obtained from analysis of the TG-DTG curves by differential and integral methods. The most pro- bable mechanism for the second stage was suggested by comparision of the kinetic parameters.
文摘The electrospray ionization mass spectrometry investigation showed that the binding sites of [ZnL]^2＋, where L is 2-[bis（2- aminoethyl）amino]ethanol, with oxidized insulin B chain are Phel, His5 and Arg22, which lead to the selective cleavages of the peptide bonds at Phe1-Val2, His5-Leu6, Glu21-Arg22, and Arg22-Gly23 of oxidized insulin B chain.
基金Supported by the Science Foundation of Guangxi Province (No. 0342025), the Youth Science Foundation of Guangxi (No. 0542020) and the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, China
文摘A new Zn（Ⅱ） complex, [Zn（L）2（H2O）2], where H2L = N-（2-hydroxy-1-naphthyli- dene）-L-sedne, has been synthesized and characterized by single-crystal X-ray diffraction. The crystal belongs to monoclinic system, space group C2/c with a = 13.669（2）, b = 6.4657（9）, c = 31.463（5） A, β = 98.010（2）°, V = 2753.6（7） A^3, Z = 8, Mr = 358.64, Dc = 1.730 g/cm^3, F（000） = 1472,μ（MoKa） = 1.814 mm^-1, the final R = 0.0355 and wR = 0.0706. The Zn（Ⅱ） atom adopts a square-pyramidal geometry coordinated by the tridentate ligand and two water molecules. Intermolecular hydrogen bonds link the complex molecules into a two-dimensional layer.
基金the National Natural Science Foundation(21373161)New Century Excellent Talents in University of Ministry of Education of China(NCET-12-1047)
文摘A new Zn（II） complex, [ZnL2Br2] （L = triadimenol） was synthesized by the reaction of ZnBr2 with the commercial fungicide of triadimenol, then characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The crystal structure shows that the complex [ZnL2Br2] crystallizes in orthorhombic, Pnam space group with a = 11.263（2）, b = 8.4478（15）, c = 36.125 （7） A, V = 3437.2 （11 ） ,A Z = 4, C28H36Br2C12N604Zn, Mr = 816.72, Dc = 1.578 g/cm3, F（000） = 1648,μ = 3.236 mm-1, the final R = 0.0388 and wR = 0.0879 for 2399 observed reflections with I 〉 2σ（/）. The central metals adopt square plane coordination geometry. And intermolecular hydrogen bonds connect Zn（Ⅱ） into a one-dimensional chain. In addition, the title complex and triadimenol were screened for antifungal activities against four selected fungi using the mycelial growth rate method. The results indicate that the complex synthesized shows better antifungal activities than the ligand triadimenol.
基金supported by the Natural Science Foundation of Hebei Normal University (L2007Z05, L2006Q09)
文摘The title compound {[Zn（NIT4Py）（fum）（HEO）2]·H2O}n, where NIT4Py = 2-（4＇- pyridinyl）-4,4,5,5-tetra-methylimidazoline-looxyl-3-oxide and fum = fumarate, has been prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic, space group P1^- with a = 6.9533（9）, b = 9.805（1）, c = 15.248（2） A, α= 94.608（2）, β = 92.328（2）, γ = 105.840（2）°, C16H24N3O9Zn, Mr = 467.75, V = 994.8（2） A^3, Z = 2, Dc = 1.562 g/cm^3,μ（MoKα） = 1.289 mm^-1, F（000） = 486, the final R = 0.0243 and wR = 0.0622 for 3505 independent reflections with Rint = 0.0125. The Zn（II） adopts a distorted five-coordinate triangle bipyramidal geometry. The basic framework structure of the complex is a 1-D chain. The intrachain hydrogen bonds are helpful to stabilize the 1-D chain structure. Furthermore, the chains are connected by O-H…O hydrogen bonds to give a 2-D double-layer network.
基金supported by National Natural Science Foundation of China(21703131,31370578)Doctoral Scientific Research Foundation of Shaanxi University of Science and Technology(2016BJ-40)+2 种基金State Key Laboratory of Pulp and Paper Engineering(201821)China Postdoctoral Science Foundation(2018M643707)Natural Science Foundation of Shaanxi Provincial Department of Education(18JK0122)
文摘Solvatochromic materials have recently attracted increasing attention owing to their great significance in the security and sensor fields.In this study,ultrafast explicit and implicit information was collected regarding a fluorescent nanocellulose membrane produced from nanocellulose membranes coated with a Zn-terpyridine complex(Zn-tpy)in a layer-by-layer manner.The fluorescent emissions of the nanocellulose membrane changed from yellow(CIE:x=0.37,y=0.45)to green(CIE:x=0.32,y=0.47)under a dichloromethane environment and 365-nm irradiation.Due to the ease of dichloromethane volatilization,fluorescent emissions quickly returned to the original state.These solvatochromic nanocellulose membranes,with ultrafast explicit and implicit information,exhibited valuable application prospects in anti-counterfeiting techniques.
基金This work was supported by the National Natural Science Foundation of China (No. 20171025 and No. 90101028)
文摘The title compound [Zn(Him2Py)(N3)2]2 (Zn2C26H38N18O2, Mr = 765.48) has been prepared and structurally characterized by X-ray diffraction methods. It crystallizes in monoclinic, space group P21/n with a = 10.989(3), b = 11.519(3), c = 13.812(4) ? b = 101.700(5), V = 1711.9(9) ?, Z = 2, Dc = 1.485 g/cm3, m(MoKa) = 1.456 mm～1, F(000) = 792, the final R = 0.0401 and wR = 0.0861 for 2054 observed reflections with I>2s(I). The imino nitroxide 2-(3- methyl-2-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl (im2Py) was reduced to obtain 2-(3-methyl -2-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-ydroxy (Him2Py) coordinating to the zinc (II) ion, around which the coordination geometry is a square-based pyramid with a terminal nitrogen atom located at the apical position. The four basal sites are occupied by two m1,1 nitrogen atoms from two different bridging azide ions and two nitrogen atoms from Him2Py. The units of [Zn(Him2Py)(N3)2]2 were connected as two dimension planes by intermolecular hydrogen bonds.
文摘There are many reports that divalent alkaline earth, first-row transition metals, and Zn(II) ions have α-glucosidase inhibitory effects. Cu(II) and Zn(II) ions, in particular, have strong α-glucosidase inhibitory effects. Several Schiff bases also display α-glucosidase inhibitory effects. In this study, we focused on safe and highly effective complexes including Zn(II) ion. We prepared and characterized the Zn(II) complexes with four different Schiff bases (N-salicylidene-β-alanine (N-sβ), N-N’-bis (salicylidene) ethylenediamine (N-bsE), N, N’-bis (salicylidene)-phenylenediamine (N-bsP), and 1-[(2-dimethylaminoethylimino) methyl]naphtholate (DMN)) and investigated their α-glucosidase inhibitory effects in vitro, using α-glycosidases from Saccharomyces sp. and rat small intestine, and in vivo, using a sucrose tolerance test. The Zn(II) complexes with DMN showed the highest in vitro and in vivo α-glucosidase inhibitory effects in this study.
文摘A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm^(-3)(KNO_3).The com- puter programs SUPERQUAD were applied for data treatment with satisfactory results.
文摘A new mixed complex [Zn(tren) (H-SSA)] was synthesized based on the reaction of ZnO,5-sulfosalicylic acid and tren in water-methanol mixed solvents where tren was tris(2-aminoethyl)amine for the first time. The structure of the mixed complex was characterized by elemental analysis, IR, 1H NMR and thermal analysis. The crystal structure of the complex was also determined by X-ray single crystal diffraction. Its crystal belongs to trigonal system with space group P31, a=1.109 67(18) nm, b=1.109 67(18) nm, c=1.236 8(4) nm, V=1.318 9(5) nm3; Dc=1.616 g·cm-3; Z=3; F(000)=666; μ=1.553 mm-1. CCDC: 253908.
