In an acidic solution the mixed polynuclear complexes could be formed by association of rareearth-arsenazo Ⅲ complexing anions with copper o-phenanthrolinate cations.In this paper the formationconditions of lanthanum...In an acidic solution the mixed polynuclear complexes could be formed by association of rareearth-arsenazo Ⅲ complexing anions with copper o-phenanthrolinate cations.In this paper the formationconditions of lanthanum-arsenazo Ⅲ-copper-o-phenanthroline complex and its related reaction mechanismhave been studied in detail.The complex exhibits an absorption maximum at 663 nm and its apparent molarabsorptivity is found to be 1.22×105L·mol-1·cm-1.The molar ratio of the components in the complex isestimated to be La:arsenazo Ⅲ:Cu:Phen=1:1:1:3.Its possible molecular formula can expressed as[Cu（Phen）3]（La-arsenazo Ⅲ）.The reaction is used to determine micro amounts of lanthanum（or rareearths）in copper containning synthetic samples and satisfactory results are obtained.展开更多
Studies on the electronic structure,molecular design,syntheses of some novel series of tetranuclear rare earth complexes in our laboratory have been reviewed.Spin-unrestricted localized INDO method was used to calcula...Studies on the electronic structure,molecular design,syntheses of some novel series of tetranuclear rare earth complexes in our laboratory have been reviewed.Spin-unrestricted localized INDO method was used to calculate the electronic structure and the chemical bonding in the typical rare earth cluster Sc[Sc_6Cl_(12)Co]was discussed.展开更多
[HoAl(CF_3COO)_2(CF_3CHOO)(C_2H_5)_2(C_4H_8O)_2]_2,Mr=1468.7,monoclinic,P 2_1/n,a=1.0084(4), b=1.8453(6),c=1.4501(6)nm,β=102.40(3)°,V=2.6355(1)nm^3,Z=2,D_c=1.81gcm^(-3),F(000)=1511, T=233K,Mo Kα radiation(λ=0....[HoAl(CF_3COO)_2(CF_3CHOO)(C_2H_5)_2(C_4H_8O)_2]_2,Mr=1468.7,monoclinic,P 2_1/n,a=1.0084(4), b=1.8453(6),c=1.4501(6)nm,β=102.40(3)°,V=2.6355(1)nm^3,Z=2,D_c=1.81gcm^(-3),F(000)=1511, T=233K,Mo Kα radiation(λ=0.071069nm).R=0.052 for 6176 unique reflections[Ⅰ≥36(Ⅰ)].The structural units consist of dimeric molecules with the mixed ligand and central bimetallic atoms,which are polynuclear lanthanoid complexes containing aluminium.Ho-Ho'distance is 0.3619(1)nm.The coordination polyhedron of Ho can be described in terms of a distored bicap-prism.展开更多
Three metal ion bridged self-assembled （SA） films of cis-di（thiocyanato）-bis（2,2＇-bipyridyl-4,4＇-dicarboxylate） ruthenium were fabricated and characterized by contact angle, UV spectra, cyclic voltammetry and ...Three metal ion bridged self-assembled （SA） films of cis-di（thiocyanato）-bis（2,2＇-bipyridyl-4,4＇-dicarboxylate） ruthenium were fabricated and characterized by contact angle, UV spectra, cyclic voltammetry and XPS. Their photoinduced electron transfer properties （PETP） were examined. Among the titled systems, the highest steady anodic photocurrent of 1773-1843 nA/cm^2 and the highest quantum yield of 3.2% were achieved. The effects of incident light intensity, bias voltage, and electron donor were also studied. The possible mechanism of electron transfer was proposed. The results reveal that different metal ion in SA films could affect significantly the photoinduced electron transfer property. Our experimental results clearly show that bridging metal ions can play both functional and structural roles in these self-assembled systems. This method of forming functional films can provide a new approach to regulate the property of similar systems.展开更多
The polynuclear complex, [La(bphsb) 2(NO 3) 3] n (bphsb=1,4 bis(phenylsulfinyl)butane) were obtained. The structure of the complex consists of ten coordinated metal ions linked up with six O atoms of the thre...The polynuclear complex, [La(bphsb) 2(NO 3) 3] n (bphsb=1,4 bis(phenylsulfinyl)butane) were obtained. The structure of the complex consists of ten coordinated metal ions linked up with six O atoms of the three bidentate nitrates and with four O atoms of the four bphsb ligands. The coordination polyhedron of the La 3+ may best be described as distorted bicapped square antiprism. The bphsb ligands act as bridges that join two neighbouring lanthanum ions to give polymeric chains. Each chain contains 18 membered macrocyclic rings with two La atoms. In the complex, the bphsb ligands adopt meso stereoisomer in which sulfur atoms are chiral, and the absolute configurations of the atoms are RS.展开更多
A novel polymeric complex [La(bipyN2O2)(TFA)3]n(TFA= trifluoroacetylacetone) was prepared. The X-ray structure analysis revealed that the complex has an infinite one-dimensional supramolecule structure with the 4,4...A novel polymeric complex [La(bipyN2O2)(TFA)3]n(TFA= trifluoroacetylacetone) was prepared. The X-ray structure analysis revealed that the complex has an infinite one-dimensional supramolecule structure with the 4,4'-bipyridyl-N,N'-dioxide as a bridge. La(III) is coordinated to eight oxygen atoms, six from three trifluoroacetylacetonate anions, two from two 4,4'-bipyridyl-N,N'-dioxide molecules.展开更多
The complexes [Pt2L2（μ-dppm）]（ClO4）2 （1） and {[Pt2L2（μ-dppm）Li（CH3CN）2]（ClO4）3}n （2）, where HL is 6-[4-（diethoxyphosphorylmethyl）phenyl]-2,2′-bipyridinyl and dppm is bis（diphenylphosphino）methane,...The complexes [Pt2L2（μ-dppm）]（ClO4）2 （1） and {[Pt2L2（μ-dppm）Li（CH3CN）2]（ClO4）3}n （2）, where HL is 6-[4-（diethoxyphosphorylmethyl）phenyl]-2,2′-bipyridinyl and dppm is bis（diphenylphosphino）methane, have been synthesized and characterized. In complex 1 the platinum（Ⅱ） center adopts a distorted square planar coordination geometry. The polymer 2 exhibits a ＂stairstep＂ configuration with one-dimensional Pt（Ⅱ）N^N^CPO- Li（Ⅰ）-OPC^N^ NPt（Ⅱ） mixed-metal units which are linked through dppm. Both complexes have metal-metal interaction with Pt- Pt distances of 3.325（2） and 3.1432（9） A, respectively, and display strong metal-metal-to-ligand charge-transfer （MMLCT） triplet state emission. The density-functional-theory calculation was used to interpret the absorption spectra of the complexes.展开更多
Two novel coordination polymers [Cd（NiL）（aipt）]（1） and [Mn（nipt）（NiL）2]？H2O（2）（NiL, H2L=2,3-dioxo- 5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien, H2aipt=5-aminoisophthalic acid, H2nipt=5-n...Two novel coordination polymers [Cd（NiL）（aipt）]（1） and [Mn（nipt）（NiL）2]？H2O（2）（NiL, H2L=2,3-dioxo- 5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien, H2aipt=5-aminoisophthalic acid, H2nipt=5-nitroisoph- thalic acid） were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Compounds 1 and 2 consist of different 1D chains including both oxamide and 5-aminoisophthalate or 5-nitroisophthalic bridge. And all these chains were further interlinked via hydrogen bonds, resulting in a 2D architecture in compounds 1 and 2.展开更多
A novel end-to-end azido-bridged polynuclear Schiff-base copper（II） complex, [Cu（C12H15Br2N2O）（N3）]n, was prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The c...A novel end-to-end azido-bridged polynuclear Schiff-base copper（II） complex, [Cu（C12H15Br2N2O）（N3）]n, was prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system, space group Pbcn with a = 24.588（5）, b = 10.377（2）, c = 13.022（3） A, V= 3322.6（12） A^3, Z = 8, Dc = 1.874 g/cm^3, Mr = 468.65, λ（MoKa） = 0.71073 A,μ = 6.130 mm^-1, F（000） = 1832, R = 0.0637 and wR = 0.1176. The Cu atom in the complex is five-coordinated in a square pyramidal geometry by three donor atoms of the Schiff-base ligand, and two N atoms from two bridging azide ligands. The [2,4-dibromo-6-[（3-dimethylaminopropylimino）methyl]phenolato]copper（II） units are linked by the bridging azide ligands, giving zigzag polymeric chains with backbones of the [--Cu-N-N-N--Cu]n type running along the b axis.展开更多
The dinuclear Schiff base cadmium（Ⅱ） complex [Cd2（C10H15N3）2（N3）2 （μ1,1-N3）2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray dif- fraction. The crystal belongs to...The dinuclear Schiff base cadmium（Ⅱ） complex [Cd2（C10H15N3）2（N3）2 （μ1,1-N3）2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray dif- fraction. The crystal belongs to the monoclinic system, space group P21/n with a = 10.819（2）, b = 11.058（2）, c = 12.766（3）A, β = 102.456（2）°, V = 1491.3（7）A^3, Z = 2, Dc = 1.665 g/cm^3, Mr = 747.42, λ（MoKα） = 0.71073 （A）, μ = 1.470 mm^-1, F（000） = 744, R = 0.0307 and wR = 0.0584. A total of 3420 unique reflections were collected, of which 2575 with Ⅰ 〉 2σ（Ⅰ） were observed. There is a crystallographic inversion centre at the midpoint of the two metal atoms in the complex. Each CdⅡ atom in the complex is in a distorted octahedral coordination. The molecules in the crystal are linked through the intermolecular hydrogen bonds of N-H…N and C-H…N, forming a three- dimensional network.展开更多
Electrocoagulation(EC)has been widely used to treat the heavymetal wastewater in industry.A novel process of sinusoidal alternating current electrocoagulation(SACC)is adopted to remove Ni2+in wastewater in this study....Electrocoagulation(EC)has been widely used to treat the heavymetal wastewater in industry.A novel process of sinusoidal alternating current electrocoagulation(SACC)is adopted to remove Ni2+in wastewater in this study.The morphology of precipitates and the distribution of the main functional iron configurations were investigated.Ferron timed complex spectroscopy can identify the monomeric iron configurations[Fe(a)],oligomeric iron configurations[Fe(b)]and polymeric iron configurations[Fe(c)].The optimal operating conditions of SACC process were determined through single-factor experiments.The maximum Ni2+removal efficiency[Re(Ni^(2+))]was achieved under the conditions of pH0=7,current density(j)=7 A/m^(2),electrolysis time(t)=25 min,c0(Ni^(2+))=100 mg/L.At pH=7,the proportion of Fe(b)and Fe(c)in the system was 50.4 at.% and 23.1 at.%,respectively.In the SACC process,Fe(b)and Fe(c)are themain iron configurations in solution,while Fe(c)are the vastmajority of the iron configurations in the direct current electrocoagulation(DCC)process.Re(Ni2+)is 99.56% for SACC and 98.75% for DCC under the same optimum conditions,respectively.The precipitates produced by SACC have a high proportion of Fe(b)configurations with sphericalα-FeOOH andγ-FeOOH structures which contain abundant hydroxyl groups.Moreover,it is demonstrated that Fe(b)has better adsorption capacity than Fe(c)through adsorption experiments of methyl orange(MO)dye.Fe(a)configurations in the homogeneous solution had no effect on the removal of nickel.展开更多
The organic-inorganic hybrid complex with formula [（CuL）2Cu3（μ-1,1-N3）4（ClO4）2], complex 1, {CuL, [5,6：14,l5-dibenzo-1,4,8,12-tetraazacyclopentadeca-7,3-diene-2,3-dione（2-）]copper（Ⅱ）}, has been synthesize...The organic-inorganic hybrid complex with formula [（CuL）2Cu3（μ-1,1-N3）4（ClO4）2], complex 1, {CuL, [5,6：14,l5-dibenzo-1,4,8,12-tetraazacyclopentadeca-7,3-diene-2,3-dione（2-）]copper（Ⅱ）}, has been synthesized and structurally determined. The crystals of complex 1 crystallize in the triclinic system with space group P1, a=0.92983（12） nm, b=1.09644（14） nm, c=1.27396（16） nm, α=70.782（2）°β=86.266（2）°,γ=78.284（2）°. In this complex, the five copper ions are bridged by macrocyclic oxamide groups and azido. Furthermore, C-H…O hydrogen bond interactions link the pentanuclear fragments to form a 2D supramolecular architecture.展开更多
The synthesis, structure and characterization of a new one-dimensional cyanide-bridgedcomplex [Ni(pn)_2Ni(CN)4]n'nH2O (where pn = 1,2-diaminopropane) are described. The structure ofthis complex consists of a one-d...The synthesis, structure and characterization of a new one-dimensional cyanide-bridgedcomplex [Ni(pn)_2Ni(CN)4]n'nH2O (where pn = 1,2-diaminopropane) are described. The structure ofthis complex consists of a one-dimensional polymeric chain-Ni(pn)2-NC-Ni(CN)2-CN-Ni(pn)2- inwhich the Ni(II) centers are linked by two CN groups.展开更多
Polynuclear gold complexes show diverse structures and bonding.An exploration into their transformation represents a challenging area of research.Herein,an unprecedented substituent-mediated transformation from pentag...Polynuclear gold complexes show diverse structures and bonding.An exploration into their transformation represents a challenging area of research.Herein,an unprecedented substituent-mediated transformation from pentagold(I)to octadecagold(I)complexes has been observed.These gold(I)-sulfido complexes with distinct structures have been fully characterized,and the transformation process has been monitored by NMR spectroscopy in solution state.展开更多
Herein,we describe the synthesis of a carborane-supported octanuclear palladacycle complex,Pd_(8)(o-C_(2)B_(10)H_(10)CS_(2)CH_(3))_(4)Cl_(4)(CH_(3)CN)_(4)(complex 1),with B(3)-H activations on o-carborane ligand.The s...Herein,we describe the synthesis of a carborane-supported octanuclear palladacycle complex,Pd_(8)(o-C_(2)B_(10)H_(10)CS_(2)CH_(3))_(4)Cl_(4)(CH_(3)CN)_(4)(complex 1),with B(3)-H activations on o-carborane ligand.The substitution reaction of 1 has been explored,and three of its substituted complexes Pd_(8)(o-C_(2)B_(10)H_(10)CS_(2)CH_(3))_(4)Cl_(4)(L)4(L=^(t)BuNC,2;L=C_(5)H_(5)N,3;L=C_(4)H_(8)S,4)have been synthesized.The m-and p-carborane disubstituted ligands m-and p-C_(2)B_(10)H_(10)(CS_(2)CH_(3))_(2)(ligands 5 and 6)as well as their B—H activated carborane complexes[m-C_(2)B_(10)H_(9)(CS_(2)CH_(3))_(2)PdCl](7)and[p-C_(2)B_(10)H_(8)(CS_(2)CH_(3))_(2)][PdCl(^(t)BuNC)]_(2)(8)have also been synthesized by the similar method.All of these complexes have been characterized,including X-ray single crystal diffraction,NMR spectroscopy,IR spectroscopy and elemental analysis methods.展开更多
A new dinucleating Schiff base ligand HL(L=C13H17N2O3) has been synthesised and characterized.The single crystal structure of its complex [L2Cu4O(AcO4)]·2H2O has beendetermined by X-ray diffraction methods.The re...A new dinucleating Schiff base ligand HL(L=C13H17N2O3) has been synthesised and characterized.The single crystal structure of its complex [L2Cu4O(AcO4)]·2H2O has beendetermined by X-ray diffraction methods.The result indicates that every Cu atom has its square pyramidal coordination polyhedron and there is a tetrahedral Cu4O core in the complex molecule.Its active sites where catalytic oxidation of dioxygen occurs have been inferred.展开更多
文摘In an acidic solution the mixed polynuclear complexes could be formed by association of rareearth-arsenazo Ⅲ complexing anions with copper o-phenanthrolinate cations.In this paper the formationconditions of lanthanum-arsenazo Ⅲ-copper-o-phenanthroline complex and its related reaction mechanismhave been studied in detail.The complex exhibits an absorption maximum at 663 nm and its apparent molarabsorptivity is found to be 1.22×105L·mol-1·cm-1.The molar ratio of the components in the complex isestimated to be La:arsenazo Ⅲ:Cu:Phen=1:1:1:3.Its possible molecular formula can expressed as[Cu（Phen）3]（La-arsenazo Ⅲ）.The reaction is used to determine micro amounts of lanthanum（or rareearths）in copper containning synthetic samples and satisfactory results are obtained.
基金Project supported by The National Natural Science Foundation of China and Science and Technology Foundation of State Education Commision of China
文摘Studies on the electronic structure,molecular design,syntheses of some novel series of tetranuclear rare earth complexes in our laboratory have been reviewed.Spin-unrestricted localized INDO method was used to calculate the electronic structure and the chemical bonding in the typical rare earth cluster Sc[Sc_6Cl_(12)Co]was discussed.
文摘[HoAl(CF_3COO)_2(CF_3CHOO)(C_2H_5)_2(C_4H_8O)_2]_2,Mr=1468.7,monoclinic,P 2_1/n,a=1.0084(4), b=1.8453(6),c=1.4501(6)nm,β=102.40(3)°,V=2.6355(1)nm^3,Z=2,D_c=1.81gcm^(-3),F(000)=1511, T=233K,Mo Kα radiation(λ=0.071069nm).R=0.052 for 6176 unique reflections[Ⅰ≥36(Ⅰ)].The structural units consist of dimeric molecules with the mixed ligand and central bimetallic atoms,which are polynuclear lanthanoid complexes containing aluminium.Ho-Ho'distance is 0.3619(1)nm.The coordination polyhedron of Ho can be described in terms of a distored bicap-prism.
基金Project supported by the National NaturaJ Science Foundation of China （Nos. 20471009, 20573010）, the Scientific Research Foundation for the Returned 0verseas Chinese Scholars, State Education Ministry, Excellent Young Scholars Research Fund of Beijing Institute of Technology （No. 000Y07-30）.
文摘Three metal ion bridged self-assembled （SA） films of cis-di（thiocyanato）-bis（2,2＇-bipyridyl-4,4＇-dicarboxylate） ruthenium were fabricated and characterized by contact angle, UV spectra, cyclic voltammetry and XPS. Their photoinduced electron transfer properties （PETP） were examined. Among the titled systems, the highest steady anodic photocurrent of 1773-1843 nA/cm^2 and the highest quantum yield of 3.2% were achieved. The effects of incident light intensity, bias voltage, and electron donor were also studied. The possible mechanism of electron transfer was proposed. The results reveal that different metal ion in SA films could affect significantly the photoinduced electron transfer property. Our experimental results clearly show that bridging metal ions can play both functional and structural roles in these self-assembled systems. This method of forming functional films can provide a new approach to regulate the property of similar systems.
文摘The polynuclear complex, [La(bphsb) 2(NO 3) 3] n (bphsb=1,4 bis(phenylsulfinyl)butane) were obtained. The structure of the complex consists of ten coordinated metal ions linked up with six O atoms of the three bidentate nitrates and with four O atoms of the four bphsb ligands. The coordination polyhedron of the La 3+ may best be described as distorted bicapped square antiprism. The bphsb ligands act as bridges that join two neighbouring lanthanum ions to give polymeric chains. Each chain contains 18 membered macrocyclic rings with two La atoms. In the complex, the bphsb ligands adopt meso stereoisomer in which sulfur atoms are chiral, and the absolute configurations of the atoms are RS.
基金The National Natural Science Foundation of China.
文摘A novel polymeric complex [La(bipyN2O2)(TFA)3]n(TFA= trifluoroacetylacetone) was prepared. The X-ray structure analysis revealed that the complex has an infinite one-dimensional supramolecule structure with the 4,4'-bipyridyl-N,N'-dioxide as a bridge. La(III) is coordinated to eight oxygen atoms, six from three trifluoroacetylacetonate anions, two from two 4,4'-bipyridyl-N,N'-dioxide molecules.
文摘The complexes [Pt2L2（μ-dppm）]（ClO4）2 （1） and {[Pt2L2（μ-dppm）Li（CH3CN）2]（ClO4）3}n （2）, where HL is 6-[4-（diethoxyphosphorylmethyl）phenyl]-2,2′-bipyridinyl and dppm is bis（diphenylphosphino）methane, have been synthesized and characterized. In complex 1 the platinum（Ⅱ） center adopts a distorted square planar coordination geometry. The polymer 2 exhibits a ＂stairstep＂ configuration with one-dimensional Pt（Ⅱ）N^N^CPO- Li（Ⅰ）-OPC^N^ NPt（Ⅱ） mixed-metal units which are linked through dppm. Both complexes have metal-metal interaction with Pt- Pt distances of 3.325（2） and 3.1432（9） A, respectively, and display strong metal-metal-to-ligand charge-transfer （MMLCT） triplet state emission. The density-functional-theory calculation was used to interpret the absorption spectra of the complexes.
基金Supported by the National Natural Science Foundation of China(Nos.20771083, 20901059, 21001081, 21043004)
文摘Two novel coordination polymers [Cd（NiL）（aipt）]（1） and [Mn（nipt）（NiL）2]？H2O（2）（NiL, H2L=2,3-dioxo- 5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien, H2aipt=5-aminoisophthalic acid, H2nipt=5-nitroisoph- thalic acid） were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Compounds 1 and 2 consist of different 1D chains including both oxamide and 5-aminoisophthalate or 5-nitroisophthalic bridge. And all these chains were further interlinked via hydrogen bonds, resulting in a 2D architecture in compounds 1 and 2.
文摘A novel end-to-end azido-bridged polynuclear Schiff-base copper（II） complex, [Cu（C12H15Br2N2O）（N3）]n, was prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system, space group Pbcn with a = 24.588（5）, b = 10.377（2）, c = 13.022（3） A, V= 3322.6（12） A^3, Z = 8, Dc = 1.874 g/cm^3, Mr = 468.65, λ（MoKa） = 0.71073 A,μ = 6.130 mm^-1, F（000） = 1832, R = 0.0637 and wR = 0.1176. The Cu atom in the complex is five-coordinated in a square pyramidal geometry by three donor atoms of the Schiff-base ligand, and two N atoms from two bridging azide ligands. The [2,4-dibromo-6-[（3-dimethylaminopropylimino）methyl]phenolato]copper（II） units are linked by the bridging azide ligands, giving zigzag polymeric chains with backbones of the [--Cu-N-N-N--Cu]n type running along the b axis.
基金Support by the Shaoxing University Research Fund
文摘The dinuclear Schiff base cadmium（Ⅱ） complex [Cd2（C10H15N3）2（N3）2 （μ1,1-N3）2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray dif- fraction. The crystal belongs to the monoclinic system, space group P21/n with a = 10.819（2）, b = 11.058（2）, c = 12.766（3）A, β = 102.456（2）°, V = 1491.3（7）A^3, Z = 2, Dc = 1.665 g/cm^3, Mr = 747.42, λ（MoKα） = 0.71073 （A）, μ = 1.470 mm^-1, F（000） = 744, R = 0.0307 and wR = 0.0584. A total of 3420 unique reflections were collected, of which 2575 with Ⅰ 〉 2σ（Ⅰ） were observed. There is a crystallographic inversion centre at the midpoint of the two metal atoms in the complex. Each CdⅡ atom in the complex is in a distorted octahedral coordination. The molecules in the crystal are linked through the intermolecular hydrogen bonds of N-H…N and C-H…N, forming a three- dimensional network.
基金supported by the National Natural Science Foundation of China (No. 51974115)the National Natural Science Foundation of Hunan Province of China (No. 2020JJ4145)the Key R & D Plan Project of Changsha (No. 2021-440)
文摘Electrocoagulation(EC)has been widely used to treat the heavymetal wastewater in industry.A novel process of sinusoidal alternating current electrocoagulation(SACC)is adopted to remove Ni2+in wastewater in this study.The morphology of precipitates and the distribution of the main functional iron configurations were investigated.Ferron timed complex spectroscopy can identify the monomeric iron configurations[Fe(a)],oligomeric iron configurations[Fe(b)]and polymeric iron configurations[Fe(c)].The optimal operating conditions of SACC process were determined through single-factor experiments.The maximum Ni2+removal efficiency[Re(Ni^(2+))]was achieved under the conditions of pH0=7,current density(j)=7 A/m^(2),electrolysis time(t)=25 min,c0(Ni^(2+))=100 mg/L.At pH=7,the proportion of Fe(b)and Fe(c)in the system was 50.4 at.% and 23.1 at.%,respectively.In the SACC process,Fe(b)and Fe(c)are themain iron configurations in solution,while Fe(c)are the vastmajority of the iron configurations in the direct current electrocoagulation(DCC)process.Re(Ni2+)is 99.56% for SACC and 98.75% for DCC under the same optimum conditions,respectively.The precipitates produced by SACC have a high proportion of Fe(b)configurations with sphericalα-FeOOH andγ-FeOOH structures which contain abundant hydroxyl groups.Moreover,it is demonstrated that Fe(b)has better adsorption capacity than Fe(c)through adsorption experiments of methyl orange(MO)dye.Fe(a)configurations in the homogeneous solution had no effect on the removal of nickel.
基金Supported by the National Natural Science Foundation of China(No.20771083)
文摘The organic-inorganic hybrid complex with formula [（CuL）2Cu3（μ-1,1-N3）4（ClO4）2], complex 1, {CuL, [5,6：14,l5-dibenzo-1,4,8,12-tetraazacyclopentadeca-7,3-diene-2,3-dione（2-）]copper（Ⅱ）}, has been synthesized and structurally determined. The crystals of complex 1 crystallize in the triclinic system with space group P1, a=0.92983（12） nm, b=1.09644（14） nm, c=1.27396（16） nm, α=70.782（2）°β=86.266（2）°,γ=78.284（2）°. In this complex, the five copper ions are bridged by macrocyclic oxamide groups and azido. Furthermore, C-H…O hydrogen bond interactions link the pentanuclear fragments to form a 2D supramolecular architecture.
文摘The synthesis, structure and characterization of a new one-dimensional cyanide-bridgedcomplex [Ni(pn)_2Ni(CN)4]n'nH2O (where pn = 1,2-diaminopropane) are described. The structure ofthis complex consists of a one-dimensional polymeric chain-Ni(pn)2-NC-Ni(CN)2-CN-Ni(pn)2- inwhich the Ni(II) centers are linked by two CN groups.
基金The University of Hong Kong for supporting the Electrospray Ionization Quadrupole Time-of-Flight Mass Spectrometry Facilities under the Support for Interdisciplinary Research in Chemical Science and the support from The University of Hong Kong under the University Research Committee(URC)Strategically Oriented Research Theme on Functional Materials for Molecular Electronicsthe Key Program of the Major Research Plan on“Architectures,Functionalities and Evolution of Hierarchical Clusters”of the National Natural Science Foundation of China(grant no.91961202)and a General Research Fund(GRF)from the Research Grants Council of Hong Kong Special Administrative Region,China(HKU17301517).L.-L.Y.acknowledges the receipt of a postgraduate studentship from The University of Hong Kong.The Beijing Synchrotron Research Facility(BSRF)is also acknowledged for providing beamline time of the synchrotron radiation X-ray diffraction facilities.
文摘Polynuclear gold complexes show diverse structures and bonding.An exploration into their transformation represents a challenging area of research.Herein,an unprecedented substituent-mediated transformation from pentagold(I)to octadecagold(I)complexes has been observed.These gold(I)-sulfido complexes with distinct structures have been fully characterized,and the transformation process has been monitored by NMR spectroscopy in solution state.
基金supported by the National Natural Science Foundation of China (Nos.22031003,21720102004)the Shanghai Science Technology Committee (No.19DZ2270100).
文摘Herein,we describe the synthesis of a carborane-supported octanuclear palladacycle complex,Pd_(8)(o-C_(2)B_(10)H_(10)CS_(2)CH_(3))_(4)Cl_(4)(CH_(3)CN)_(4)(complex 1),with B(3)-H activations on o-carborane ligand.The substitution reaction of 1 has been explored,and three of its substituted complexes Pd_(8)(o-C_(2)B_(10)H_(10)CS_(2)CH_(3))_(4)Cl_(4)(L)4(L=^(t)BuNC,2;L=C_(5)H_(5)N,3;L=C_(4)H_(8)S,4)have been synthesized.The m-and p-carborane disubstituted ligands m-and p-C_(2)B_(10)H_(10)(CS_(2)CH_(3))_(2)(ligands 5 and 6)as well as their B—H activated carborane complexes[m-C_(2)B_(10)H_(9)(CS_(2)CH_(3))_(2)PdCl](7)and[p-C_(2)B_(10)H_(8)(CS_(2)CH_(3))_(2)][PdCl(^(t)BuNC)]_(2)(8)have also been synthesized by the similar method.All of these complexes have been characterized,including X-ray single crystal diffraction,NMR spectroscopy,IR spectroscopy and elemental analysis methods.
文摘A new dinucleating Schiff base ligand HL(L=C13H17N2O3) has been synthesised and characterized.The single crystal structure of its complex [L2Cu4O(AcO4)]·2H2O has beendetermined by X-ray diffraction methods.The result indicates that every Cu atom has its square pyramidal coordination polyhedron and there is a tetrahedral Cu4O core in the complex molecule.Its active sites where catalytic oxidation of dioxygen occurs have been inferred.
