In recent years,rechargeable aqueous zinc ion batteries(ZIBs),as emerging energy storage devices,stand out from numerous metal ion batteries.Due to the advantages of low cost,environmentally friendly characteristic an...In recent years,rechargeable aqueous zinc ion batteries(ZIBs),as emerging energy storage devices,stand out from numerous metal ion batteries.Due to the advantages of low cost,environmentally friendly characteristic and safety,ZIBs can be considered as alternatives to lithium-ion batteries(LIBs).Vanadiumbased compounds with various structures and large layer spacings are considered as suitable cathode candidates for ZIBs.In this review,the recent research advances of vanadium-based electrode materials are systematically summarized.The electrode design strategy,electrochemical performances and energy storage mechanisms are emphasized.Finally,we point out the limitation of vanadium-based materials at present and the future prospect.展开更多
Two new zinc（Ⅱ） complexes, [Zn2L2Ch].2[ZnL（CH3OH）Cl2] 1 and [ZnL2（NO3）2] 2, were synthesized by reacting ZnX2.nH2O （X = Cl^-, NO3^-） and a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol ...Two new zinc（Ⅱ） complexes, [Zn2L2Ch].2[ZnL（CH3OH）Cl2] 1 and [ZnL2（NO3）2] 2, were synthesized by reacting ZnX2.nH2O （X = Cl^-, NO3^-） and a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol （C15HIsNO2, L） which was obtained by the condensation of o-vanillin （2-hydroxy-3-methoxybenzaldehyde） with p-toluidine. Both 1 and 2 were characterized by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, IH-NMR spectra and thermogravimetrie analysis. The Schiff base ligand and its zinc（Ⅱ） complexes have been tested in vitro to evaluate their antibacterial activity against bacteria, viz., Escherichia Coli, Staphylococcus aureus and Bacillus Subtilis. The results show that these complexes have higher activity than the corresponding free Schiff base ligand against the same bacteria.展开更多
The title complex is a new binuclear Zn(Ⅱ) with chelate ligand of Schiff base containing S and N atom.The complex crystallizes in the orthorhombicspace group Pccn,with a=12.338(9),b=16.666(8),c=17.503(6),V=3599(6),Mr...The title complex is a new binuclear Zn(Ⅱ) with chelate ligand of Schiff base containing S and N atom.The complex crystallizes in the orthorhombicspace group Pccn,with a=12.338(9),b=16.666(8),c=17.503(6),V=3599(6),Mr=723.52,Z=4,Dx=1.34 g/cm3,μ=15.22 cm-1,F(000)=1488.The structure was solved by direct methods and the final R=0.078.The crystal consists of discrete molecules with symmetric center at the center of the fourmembered ring consisting of two Zn atoms and two O atoms.展开更多
Rational design and exploration of low-cost and robust bifunctional oxygen electrocatalysts are vitally important for developing high-performance zinc-air batteries(ZABs).Herein,we reported a facile yet cost-efficient...Rational design and exploration of low-cost and robust bifunctional oxygen electrocatalysts are vitally important for developing high-performance zinc-air batteries(ZABs).Herein,we reported a facile yet cost-efficient approach to construct a bifunctional oxygen reduction reaction(ORR)/oxygen evolution reaction(OER)electrocatalyst composed of N-doped porous carbon nanosheet flowers decorated with Fe Co nanoparticles(Fe Co/N-CF).Rational design of this catalyst is achieved by designing Schiff-base polymer with unique molecular structure via hydrogen bonding of cyanuramide and terephthalaldehyde polycondensate in the presence of metal cations.It exhibits excellent activity and stability for electrocatalysis of ORR/OER,enabling ZAB with a high peak power density of 172 m W cm^(-2)and a large specific capacity of 811 m A h g^(-1)Znat large current.The rechargeable ZAB demonstrates excellent durability for 1000 h with slight voltage decay,far outperforming a couple of precious Pt/Ir-based catalysts.Density functional theory(DFT)calculations reveal that high activity of bimetallic Fe Co stems from enhanced O_(2)and OH-adsorption and accelerated O_(2)dissociation by OAO bond activation.展开更多
A new mononuclear [Zn（H-1L）2] （L = 1H-indole-3-ethylene-salicylaldimine） was synthesized through the reaction of Zn（Ac）2, salicylaldehyde and tryptamine in hot ethanol solution and characterized by X-ray crystal...A new mononuclear [Zn（H-1L）2] （L = 1H-indole-3-ethylene-salicylaldimine） was synthesized through the reaction of Zn（Ac）2, salicylaldehyde and tryptamine in hot ethanol solution and characterized by X-ray crystal structure analysis. The crystal belongs to monoclinic, space group P21/n with a = 15.014（2）, b = 10.857（1）, c = 17.489（1）A,β = 95.49（1）°, V = 2837.8（5） A^3, Z = 4, Dc = 1.386 g/cm^3, μ = 0.904 mm-1, F（000） = 1232, the final R = 0.0463 and wR = 0.0890 for 4990 independent reflections. In the complex, the Zn2＋ ion presents a distorted N2O2 tetrahedral coordination involving two H-1L ligands.展开更多
The title azide-bridged dinuclear Schiff base zinc（Ⅱ） complex [Zn2（C12H16N3O3）2- （μ1,1-N3）2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal...The title azide-bridged dinuclear Schiff base zinc（Ⅱ） complex [Zn2（C12H16N3O3）2- （μ1,1-N3）2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/n with a = 8.736（2）, b = 14.850（3）, c = 11.775（2）A, β = 102.42（3）°, V = 1491.8（5） A^3, Z = 2, Dc = 1.593 g/cm^3, Mr = 715.36, λ（MoKα） = 0.71073A , μ = 1.669 mm^-1, F（000） = 736, the final R = 0.0338 and wR = 0.0789. A total of 3411 unique reflections were collected, of which 2777 with I 〉 2σ（I） were observed. The molecule of the complex is located on a crystallographic inversion centre. Each Zn atom in the complex is five-coordinated by one Schiff base ligand and two bridging azide groups, forming a trigonal bipyramidal configuration. The Zn···Zn distance is 3.328（2）A . In the crystal structure, molecules are linked through intermolecular C–H…N hydrogen bonds, forming layers parallel to the bc plane. The complex shows low cytotoxic property to both normal and carcinoma cells.展开更多
The title mononuclear zinc（Ⅱ） complex [Zn（BCDP）（H2O）2] （BCDP = N,N＇-bis（3,5dichlorosalicylidene）-1,3-diaminopropane） was prepared and characterized by elemental analysis, 1R spectra and single-crystal X-ra...The title mononuclear zinc（Ⅱ） complex [Zn（BCDP）（H2O）2] （BCDP = N,N＇-bis（3,5dichlorosalicylidene）-1,3-diaminopropane） was prepared and characterized by elemental analysis, 1R spectra and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system, space group Pnma with a = 7.887（1）, b = 23.788（2）, c = 10.295（4） A, Z= 4, V= 1931.5（8） ,A^3, Dc = 1.786 g/cm^3, Mr = 519.49, λ（MoKa） = 0.71073 A, μ = 1.853 mm^-1, F（000） = 1048, R = 0.0464 and wR = 0.0918. A total of 2273 unique reflections were collected, of which 1570 with 1 〉 2σ（I） were observed. The molecule of the complex has crystallographic mirror symmetry. The Zn atom is sixcoordinated in an octahedral geometry. In the crystal, the molecules are linked through intermolecular O-H…O and O-H…Cl hydrogen bonds, forming chains running along the a axis.展开更多
A Schiff base zinc（Ⅱ） complex [Zn（C12H16BrCIN2O）2（NCS）2] was prepared and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P...A Schiff base zinc（Ⅱ） complex [Zn（C12H16BrCIN2O）2（NCS）2] was prepared and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 8.414（1）, b = 9.124（1）, c = 22.212（3） A, α= 79.177（2）, β = 86.296（2）, γ = 89.899（2）°, V= 1671.3（4） A3, Z = 2, Dc = 1.631 g/cm^3, Mr = 820.79, λ（MoKα） = 0.71073 A,μ= 3.444 mm^-1, F（000） = 824, R = 0.0646 and wR = 0.1179. A total of 7371 unique reflections were collected, of which 3904 with I 〉 2σ（Ⅰ） were observed. The complex crystallizes with two half-molecules per asymmetric unit and each mononuclear molecule is centrosymmetric. The Zn atom lying at the inversion centre is six-coordinated in a slightly distorted octahedral geometry by two phenolate O atoms and two inaine N atoms from two Schiffbase ligands, as well as two N atoms from two thiocyanate anions. In flae crystal structure, the combination of re-re stacking interactions and intermolecular hydrogen bonds （N-H…Br, N-H…O, N-H…N, C-H…O, C-H…S and C-H…CI） leads to a three-dimensional network.展开更多
The title complex is a new tetranuclear chelate of Schiff base. Thecomplex crystallizes in the tetragonal, space group P42/n with cell dimensions: a=b=14. 999(3), c=8. 133(2) A, V=1829. 7(6) A 3, empirical formula C36...The title complex is a new tetranuclear chelate of Schiff base. Thecomplex crystallizes in the tetragonal, space group P42/n with cell dimensions: a=b=14. 999(3), c=8. 133(2) A, V=1829. 7(6) A 3, empirical formula C36H36N4O6Zn4,Mr=914. 16, Z=2, Dc=1. 65 g/cm3, μ= 2. 647 mm-1, F(000) = 928. The structure was solved by direct methods and the final R=0. 0377. The molecule consists offour Zn(Ⅱ) cations and four ligand anions. Each Zn atom is coordinated with one nitrogen atom and one oxygen atom both from one ligand, and with two oxygen atomsfrom other two ligands to form a distorted tetrahedron.展开更多
The title phenolic oxygen bridged dinuclear Schiff base zinc（II） complex [Zn2Br2- （C15H14BrN2O）2] was synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The crystal belongs t...The title phenolic oxygen bridged dinuclear Schiff base zinc（II） complex [Zn2Br2- （C15H14BrN2O）2] was synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 9.2279（17）, b = 12.096（2）, c = 16.286（3） A, α = 75.402（3）, β = 87.464（3）, γ= 72.746（3）°, V = 1679.1（5） A^3, Z = 2, Dc = 1.833 g/cm^3, Mr = 926.94, λ（MoKα） = 0.71073 A, μ= 6.221 mm^-1, F（000） = 904, the final R = 0.0601 and wR = 0.1155. A total of 7453 unique reflections were collected, of which 3425 with I 〉 2σ（I） were observed. One Zn atom is six-coordinate in an octahedral geometry, and the other one is four-coordinate in a tetrahedral geometry. The Zn...Zn distance is 3.106（2） A. In the crystal structure, molecules are linked through intermolecular hydrogen bonds typed N-H...Br and C-H...Br, forming zigzag chains running along the b axis. The complex shows potent cytotoxic property to both normal and carcinoma cells.展开更多
Coordination of an axial ligand to metal center to enhance the second-order nonlinear optical（NLO） re- sponse of a two-dimensional bis（salicylaldiminato） zinc（II） Schiff-base complex is an unprecedented model. T...Coordination of an axial ligand to metal center to enhance the second-order nonlinear optical（NLO） re- sponse of a two-dimensional bis（salicylaldiminato） zinc（II） Schiff-base complex is an unprecedented model. The second-order NLO responses of a series of axially substituted bis（salicylaldiminato） zinc（II） Schiff-base complexes were explored according to the finite field（FF） method at CAM-B3LYP/6-31＋G（d） level（LANL2DZ basis set for metal atoms）. The results show that the second-order NLO properties can be effectively tuned by exchanging the do- nor and accepter of the axial ligand and extending the length of the conjugated bridge along the axial direction. A system involving the electron acceptor along the appropriate direction has a large three-dimensional second-order NLO response. Meanwhile, time dependent density functional theory（TD-DFT） method was employed to calculate the physical parameters of excited states. The results show that the Y- and Z-polarized transitions of the zinc（II） Schiff-base complex are the first and second excited states, respectively, and have a low-lying excited energy. Al- though the X-polarized transition has a high excited energy, the large oscillator strength indicates that it will signifi- cantly contribute to the second-order NLO response.展开更多
基金supported by the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2019WNLOKF017)Education Department Funding of Liaoning province(LJGD2019001)Funding of Science and Technology Bureau,Shenyang City(No.RC190138)。
文摘In recent years,rechargeable aqueous zinc ion batteries(ZIBs),as emerging energy storage devices,stand out from numerous metal ion batteries.Due to the advantages of low cost,environmentally friendly characteristic and safety,ZIBs can be considered as alternatives to lithium-ion batteries(LIBs).Vanadiumbased compounds with various structures and large layer spacings are considered as suitable cathode candidates for ZIBs.In this review,the recent research advances of vanadium-based electrode materials are systematically summarized.The electrode design strategy,electrochemical performances and energy storage mechanisms are emphasized.Finally,we point out the limitation of vanadium-based materials at present and the future prospect.
文摘Two new zinc（Ⅱ） complexes, [Zn2L2Ch].2[ZnL（CH3OH）Cl2] 1 and [ZnL2（NO3）2] 2, were synthesized by reacting ZnX2.nH2O （X = Cl^-, NO3^-） and a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol （C15HIsNO2, L） which was obtained by the condensation of o-vanillin （2-hydroxy-3-methoxybenzaldehyde） with p-toluidine. Both 1 and 2 were characterized by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, IH-NMR spectra and thermogravimetrie analysis. The Schiff base ligand and its zinc（Ⅱ） complexes have been tested in vitro to evaluate their antibacterial activity against bacteria, viz., Escherichia Coli, Staphylococcus aureus and Bacillus Subtilis. The results show that these complexes have higher activity than the corresponding free Schiff base ligand against the same bacteria.
文摘The title complex is a new binuclear Zn(Ⅱ) with chelate ligand of Schiff base containing S and N atom.The complex crystallizes in the orthorhombicspace group Pccn,with a=12.338(9),b=16.666(8),c=17.503(6),V=3599(6),Mr=723.52,Z=4,Dx=1.34 g/cm3,μ=15.22 cm-1,F(000)=1488.The structure was solved by direct methods and the final R=0.078.The crystal consists of discrete molecules with symmetric center at the center of the fourmembered ring consisting of two Zn atoms and two O atoms.
基金supported by the National Science Foundation of China(21805235)the Opening Foundation of Creative Platform of the Key Laboratory of the Education Department of Hunan Province(20K131)the Construct Program of the Key Discipline in Hunan Province。
文摘Rational design and exploration of low-cost and robust bifunctional oxygen electrocatalysts are vitally important for developing high-performance zinc-air batteries(ZABs).Herein,we reported a facile yet cost-efficient approach to construct a bifunctional oxygen reduction reaction(ORR)/oxygen evolution reaction(OER)electrocatalyst composed of N-doped porous carbon nanosheet flowers decorated with Fe Co nanoparticles(Fe Co/N-CF).Rational design of this catalyst is achieved by designing Schiff-base polymer with unique molecular structure via hydrogen bonding of cyanuramide and terephthalaldehyde polycondensate in the presence of metal cations.It exhibits excellent activity and stability for electrocatalysis of ORR/OER,enabling ZAB with a high peak power density of 172 m W cm^(-2)and a large specific capacity of 811 m A h g^(-1)Znat large current.The rechargeable ZAB demonstrates excellent durability for 1000 h with slight voltage decay,far outperforming a couple of precious Pt/Ir-based catalysts.Density functional theory(DFT)calculations reveal that high activity of bimetallic Fe Co stems from enhanced O_(2)and OH-adsorption and accelerated O_(2)dissociation by OAO bond activation.
基金This project was supported by the National Natural Science Foundation of Jiangsu Province (BK2005045)the Key Marine Biotechnology Lab. of HHIT and the Natural Science Foundation of HHIT (Z2005016)
文摘A new mononuclear [Zn（H-1L）2] （L = 1H-indole-3-ethylene-salicylaldimine） was synthesized through the reaction of Zn（Ac）2, salicylaldehyde and tryptamine in hot ethanol solution and characterized by X-ray crystal structure analysis. The crystal belongs to monoclinic, space group P21/n with a = 15.014（2）, b = 10.857（1）, c = 17.489（1）A,β = 95.49（1）°, V = 2837.8（5） A^3, Z = 4, Dc = 1.386 g/cm^3, μ = 0.904 mm-1, F（000） = 1232, the final R = 0.0463 and wR = 0.0890 for 4990 independent reflections. In the complex, the Zn2＋ ion presents a distorted N2O2 tetrahedral coordination involving two H-1L ligands.
基金This work was supported by the Jingchu University of Technology.
文摘The title azide-bridged dinuclear Schiff base zinc（Ⅱ） complex [Zn2（C12H16N3O3）2- （μ1,1-N3）2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/n with a = 8.736（2）, b = 14.850（3）, c = 11.775（2）A, β = 102.42（3）°, V = 1491.8（5） A^3, Z = 2, Dc = 1.593 g/cm^3, Mr = 715.36, λ（MoKα） = 0.71073A , μ = 1.669 mm^-1, F（000） = 736, the final R = 0.0338 and wR = 0.0789. A total of 3411 unique reflections were collected, of which 2777 with I 〉 2σ（I） were observed. The molecule of the complex is located on a crystallographic inversion centre. Each Zn atom in the complex is five-coordinated by one Schiff base ligand and two bridging azide groups, forming a trigonal bipyramidal configuration. The Zn···Zn distance is 3.328（2）A . In the crystal structure, molecules are linked through intermolecular C–H…N hydrogen bonds, forming layers parallel to the bc plane. The complex shows low cytotoxic property to both normal and carcinoma cells.
基金This work was supported by the Scientific Research Foundation of Education Office of Liaoning Province (No. 2005226)
文摘The title mononuclear zinc（Ⅱ） complex [Zn（BCDP）（H2O）2] （BCDP = N,N＇-bis（3,5dichlorosalicylidene）-1,3-diaminopropane） was prepared and characterized by elemental analysis, 1R spectra and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system, space group Pnma with a = 7.887（1）, b = 23.788（2）, c = 10.295（4） A, Z= 4, V= 1931.5（8） ,A^3, Dc = 1.786 g/cm^3, Mr = 519.49, λ（MoKa） = 0.71073 A, μ = 1.853 mm^-1, F（000） = 1048, R = 0.0464 and wR = 0.0918. A total of 2273 unique reflections were collected, of which 1570 with 1 〉 2σ（I） were observed. The molecule of the complex has crystallographic mirror symmetry. The Zn atom is sixcoordinated in an octahedral geometry. In the crystal, the molecules are linked through intermolecular O-H…O and O-H…Cl hydrogen bonds, forming chains running along the a axis.
基金the Natural Science Foundation of Anhui Provincial Universities (No. 2005KJ019ZD)
文摘A Schiff base zinc（Ⅱ） complex [Zn（C12H16BrCIN2O）2（NCS）2] was prepared and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 8.414（1）, b = 9.124（1）, c = 22.212（3） A, α= 79.177（2）, β = 86.296（2）, γ = 89.899（2）°, V= 1671.3（4） A3, Z = 2, Dc = 1.631 g/cm^3, Mr = 820.79, λ（MoKα） = 0.71073 A,μ= 3.444 mm^-1, F（000） = 824, R = 0.0646 and wR = 0.1179. A total of 7371 unique reflections were collected, of which 3904 with I 〉 2σ（Ⅰ） were observed. The complex crystallizes with two half-molecules per asymmetric unit and each mononuclear molecule is centrosymmetric. The Zn atom lying at the inversion centre is six-coordinated in a slightly distorted octahedral geometry by two phenolate O atoms and two inaine N atoms from two Schiffbase ligands, as well as two N atoms from two thiocyanate anions. In flae crystal structure, the combination of re-re stacking interactions and intermolecular hydrogen bonds （N-H…Br, N-H…O, N-H…N, C-H…O, C-H…S and C-H…CI） leads to a three-dimensional network.
文摘The title complex is a new tetranuclear chelate of Schiff base. Thecomplex crystallizes in the tetragonal, space group P42/n with cell dimensions: a=b=14. 999(3), c=8. 133(2) A, V=1829. 7(6) A 3, empirical formula C36H36N4O6Zn4,Mr=914. 16, Z=2, Dc=1. 65 g/cm3, μ= 2. 647 mm-1, F(000) = 928. The structure was solved by direct methods and the final R=0. 0377. The molecule consists offour Zn(Ⅱ) cations and four ligand anions. Each Zn atom is coordinated with one nitrogen atom and one oxygen atom both from one ligand, and with two oxygen atomsfrom other two ligands to form a distorted tetrahedron.
文摘The title phenolic oxygen bridged dinuclear Schiff base zinc（II） complex [Zn2Br2- （C15H14BrN2O）2] was synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 9.2279（17）, b = 12.096（2）, c = 16.286（3） A, α = 75.402（3）, β = 87.464（3）, γ= 72.746（3）°, V = 1679.1（5） A^3, Z = 2, Dc = 1.833 g/cm^3, Mr = 926.94, λ（MoKα） = 0.71073 A, μ= 6.221 mm^-1, F（000） = 904, the final R = 0.0601 and wR = 0.1155. A total of 7453 unique reflections were collected, of which 3425 with I 〉 2σ（I） were observed. One Zn atom is six-coordinate in an octahedral geometry, and the other one is four-coordinate in a tetrahedral geometry. The Zn...Zn distance is 3.106（2） A. In the crystal structure, molecules are linked through intermolecular hydrogen bonds typed N-H...Br and C-H...Br, forming zigzag chains running along the b axis. The complex shows potent cytotoxic property to both normal and carcinoma cells.
基金Supported by the National Natural Science Foundation of China（No.21373043）, the Chinese Postdoctoral Science Founda- tion（No.2013M540261）, the Scientific Research Fund for Doctor of Northeast Dianli University, China（No.BSJXM-201110） and the Innovation Fund for Graduate Student of Northeast Dianli University, China.
文摘Coordination of an axial ligand to metal center to enhance the second-order nonlinear optical（NLO） re- sponse of a two-dimensional bis（salicylaldiminato） zinc（II） Schiff-base complex is an unprecedented model. The second-order NLO responses of a series of axially substituted bis（salicylaldiminato） zinc（II） Schiff-base complexes were explored according to the finite field（FF） method at CAM-B3LYP/6-31＋G（d） level（LANL2DZ basis set for metal atoms）. The results show that the second-order NLO properties can be effectively tuned by exchanging the do- nor and accepter of the axial ligand and extending the length of the conjugated bridge along the axial direction. A system involving the electron acceptor along the appropriate direction has a large three-dimensional second-order NLO response. Meanwhile, time dependent density functional theory（TD-DFT） method was employed to calculate the physical parameters of excited states. The results show that the Y- and Z-polarized transitions of the zinc（II） Schiff-base complex are the first and second excited states, respectively, and have a low-lying excited energy. Al- though the X-polarized transition has a high excited energy, the large oscillator strength indicates that it will signifi- cantly contribute to the second-order NLO response.
