A new metal-organic complex Zn2(cbba)4(phen)2 (Hcbba = 2-(4'chlorine-ben- zoyl)benzoic acid, phen = 1,10-phenanthroline) 1 has been hydrothermally synthesized and structurally characterized by elemental analy...A new metal-organic complex Zn2(cbba)4(phen)2 (Hcbba = 2-(4'chlorine-ben- zoyl)benzoic acid, phen = 1,10-phenanthroline) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR, fluorescence spectrum and single-crystal X-ray diffraction. The compound crystallizes in orthorhombic, space group Pbcn with a = 12.0821(II), b = 18.3140(17), c = 30.961(3) A, V= 6850.7(11) A^3, C80H48C14N4O12Zn2, Mr= 1529.76, Dc = 1.483 g/cm^3,μ(MoKa) = 0.925 mm^-1, F(000) = 3120, Z = 4, the final R = 0.0559 and wR = 0.1146 for 3963 observed reflections (I〉 2σ(I)). In the crystal structure, the zinc atom is five-coordinated with three carboxylate oxygen atoms from three different cbba ligands and two nitrogen atoms from the phen ligand, showing a distorted square-pyramidal geometry. Furthermore, it exhibits a 3D supramolecular network through π-π interactions and shows yellow photoluminescent property at room temperature.展开更多
A new dinuclear complex [Zn(dpa)(bipy)(H2O)]2 (dpa = 2,2'-diphenic acid, bipy = 2,2'-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR, fluorescence s...A new dinuclear complex [Zn(dpa)(bipy)(H2O)]2 (dpa = 2,2'-diphenic acid, bipy = 2,2'-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR, fluorescence spectrum and single-crystal X-ray diffraction. The complex crystallizes in monoclinic, space group P21/c with a = 10.960(2), b = 9.4841(18), c = 20.599(4), β = 104.452(3)o, V = 2073.4(7)3, C48H36N4O10Zn2, Mr = 959.55, Dc = 1.537 g/cm3, μ(MoKα) = 1.225 mm-1, F(000) = 984, Z = 2, the final R = 0.0364 and wR = 0.0843 for 2788 observed reflections (I 〉 2σ(I)). In the crystal structure, the zinc atom is five-coordinated with two carboxylate oxygen atoms from different dpas, one coordinated water molecule and two nitrogen atoms from bipy ligands, showing a slightly distorted triangular bipyramidal geometry. Furthermore, it exhibits a zero-dimensional network structure with a sixteen-membered ring and shows yellow photoluminescent property at room temperature.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
A new zinc(II) complex, Zn(2-NH2py)2Br2 (py=pyridine), has been synthesized, and its molecular structure has been confirmed by IR, elemental analysis and -ray crystal structure analysis. Its space group is P21/n with...A new zinc(II) complex, Zn(2-NH2py)2Br2 (py=pyridine), has been synthesized, and its molecular structure has been confirmed by IR, elemental analysis and -ray crystal structure analysis. Its space group is P21/n with Mr=413.43 (C10H12Br2N4Zn), a=7.435(2), b=12.865(3), c=14.186(4)? b=94.08(2)? V=1353.5(5) 3, Z=4, Dc=2.029 g/cm3, F(000)=328, ?2.378mm-1, R=0.0283, wR=0.0501. The total observed reflections with I≥2?I) were 5314, of which the independent reflections were 3106. The complex structure contains a distorted tetrahedron formed by four atoms coordinated to zinc atom, namely two bromide atoms and two nitrogen atoms. The two ZnBr bond lengths within one molecule, 2.3763(6) and 2.4002(5)? respectively, are not equal; and so are the two ZnN bond lengths, which are 2.031(2) and 2.044(2)?respectively. The calculation results using PM3 method through MOPAC software package in Chem 3D show that its first molecular hyperpolarizability b value is 5.210-30esu, which is comparable with that of p-nitroaniline. No bulk SHG effect has been detected due to the centrosymmetric space group.展开更多
Two novel coordination compounds, [Zn(L)2(OOCH)2] (1) and [Zn(L)3(OCHO)](OCHO)]·H2O (2) (where L = 2-isopropylimidazole, C6H10N2) have been prepared by reaction of 2-isopropylimidazole with zinc(II) formate at ro...Two novel coordination compounds, [Zn(L)2(OOCH)2] (1) and [Zn(L)3(OCHO)](OCHO)]·H2O (2) (where L = 2-isopropylimidazole, C6H10N2) have been prepared by reaction of 2-isopropylimidazole with zinc(II) formate at room temperature using toluene as solvent. These compounds were characterized by elemental and thermal analyses, IR, 1HNMR and 13CNMR spectroscopies, single crystal X-ray diffraction and DFT studies. The Zn centers in 1 and 2 adopt pseudo-tetrahedral coordination geometries. Compound 1 crystallizes in the monoclinic system P2/c space group whereas compound 2 crystallizes in the P-1 space group of the triclinic crystal system. Several types of hydrogen intra-/intermolecular interactions are observed in these materials and extend into a two-dimensional leaf like network in 1 and a two-dimensional lattice of rectilinear pillars in 2. Compounds 1 and 2 were also optimized and their frontier molecular orbitals, global reactivity descriptors, molecular electrostatic potential, natural bond orbitals were investigated using density functional theory (DFT). In fact the induced structural differences from complex 1 to complex 2 led to the reduction of the frontier molecular orbital energy gap by 1.338 eV and a decrease of the chemical hardness by 0.669 eV.展开更多
The biosorption potential of dried activated sludge as a biosorbent for zinc(Ⅱ) removal from aqueous solution was investigated.The effects of initial pH,contact time,initial zinc ion concentration,and adsorbent dos...The biosorption potential of dried activated sludge as a biosorbent for zinc(Ⅱ) removal from aqueous solution was investigated.The effects of initial pH,contact time,initial zinc ion concentration,and adsorbent dosage on the biosorption processes were determined,and the equilibrium data were modeled by the Langmuir and Freundlich isotherms.The Langmuir isotherm model (R 2=0.999) was proved to fit the equilibrium data much better than the Freundlich isotherm model (R 2=0.918).The monolayer adsorption capacity of dried activated sludge for zinc(Ⅱ) was found to be 17.86 mg/g at pH of 5 and 25°C.The kinetic data were tested using pseudo firstand second-order models.The results suggested that the pseudo second-order model (R 2 〉 0.999) was better for the description of the adsorption behavior of zinc(Ⅱ) onto the dried activated sludge.Fourier transform infrared spectral analysis showed that the dominant mechanism of zinc(Ⅱ) biosorption onto the dried activated sludge was the binding between amide groups and zinc ions.展开更多
A new 2D Zn(Ⅱ) coordination polymer [Zn(TAU)2]n (1, HTAU=2-aminoethane- sulfonic acid) constructed by 2-aminoethanesulfonic acid ligand has been hydrothermally synthesized by the reaction of Zn(CH3COO)2 and 2...A new 2D Zn(Ⅱ) coordination polymer [Zn(TAU)2]n (1, HTAU=2-aminoethane- sulfonic acid) constructed by 2-aminoethanesulfonic acid ligand has been hydrothermally synthesized by the reaction of Zn(CH3COO)2 and 2-aminoethanesulfonic acid with a 1:2 mole ratio and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy and thermogravimetric analysis. Crystal structural analysis reveals it crystallizes in monoclinic, space group P21/c with a=8.672(4), b=6.523(3), c=9.134(5) , β=115.441(5)°, V=466.6(4) 3, Mr=313.65, Z=2, Dc=2.232 Mg·m-3, F(000) =320, μ(MoKα)=3.091 mm-1, the final R=0.0358 and wR=0.0919 for 2026 observed reflections with Ⅰ 〉 2σ(Ⅰ). In the structure, each zinc(Ⅱ) ion is coordinated in a slightly distorted octahedron, and each μ3-TAU– acts as a bridge to bond three neighboring Zn(Ⅱ) ions to form an infinite 2D network structure.展开更多
Two novel mono-nuclear zinc(Ⅱ) complexes with oligoaniline-functionalized terpyridine ligands have been synthesized and verified by 1H-NMR,13C-NMR,Elemental Analysis (EA) and X-ray Diffraction (XRD). The UV-vis...Two novel mono-nuclear zinc(Ⅱ) complexes with oligoaniline-functionalized terpyridine ligands have been synthesized and verified by 1H-NMR,13C-NMR,Elemental Analysis (EA) and X-ray Diffraction (XRD). The UV-vis spectra show the ligand-centered (LC) π-π* transitions and intra-ligand charge transfer (1ILCT) transitions,and the 1ILCT band red-shifts with the increasing number of aromatic amine groups in the ligands. Complex [Zn(L1)2](PF6)2 with an aromatic amine group in ligand shows a strong emission peak at 523 nm in the MeCN solution at 293 K and a blue-shifted band at 517 nm in the alcoholic glass at 77 K. However,for complex [Zn(L2)2](PF6)2 containing aniline dimer modified ligand,no apparent emission can be observed in the MeCN solution at room temperature due to a PET non-radiative decay pathway. Both of them show multiplicate redox processes based on oligoaniline and terpyridine units. The shifts of redox potentials also reflect the D-A interactions between the oligoaniline units and [Zn(TPY)2]2+ core.展开更多
A new complex [Zn1.5(dpa)1.5(bim)]2n(dpa = 2,2-diphenic acid,bim = benzimida-zole)1 has been hydrothermally synthesized and structurally characterized by elemental analysis,IR,fluorescence spectrum and single-cr...A new complex [Zn1.5(dpa)1.5(bim)]2n(dpa = 2,2-diphenic acid,bim = benzimida-zole)1 has been hydrothermally synthesized and structurally characterized by elemental analysis,IR,fluorescence spectrum and single-crystal X-ray diffraction.The complex crystallizes in monoclinic,space group C2/c with a = 18.773(8),b = 16.560(7),c = 16.417(9),β = 94.737(9)o,V = 5086(4)3,C56H36N4O12Zn3,Mr = 1153.00,Dc = 1.506 g/cm3,μ(MoKα)= 1.472 mm1,F(000)= 2344,Z = 4,the final R = 0.0573 and wR = 0.1164 for 2968 observed reflections(I 2σ(I)).It exhibits a one-dimensional chain-like structure and shows luminescent property in the blue region.展开更多
A new zinc(Ⅱ) compound, [Zn(BTA)(UCA)]n (1, HBTA = 1,2,3-benzotriazole, HUCA = 4-imidazoleacrylic acid), has been synthesized via the hydrothermal reactions of Zn(OAC)2.2H20, HBTA and HUCA. The crystal stru...A new zinc(Ⅱ) compound, [Zn(BTA)(UCA)]n (1, HBTA = 1,2,3-benzotriazole, HUCA = 4-imidazoleacrylic acid), has been synthesized via the hydrothermal reactions of Zn(OAC)2.2H20, HBTA and HUCA. The crystal structure is of monoclinic, space group P21/c with a = 7.450(3), b = 18.911 (8), c = 9.198(4) A, fl = 94.317(8)°, V = 1292.2(9) A3, C12HgNsO2Zn, Mr = 320.63, Z = 4, Dc = 1.648 g/cm3, F(000) = 648,/z = 1.909 mm-1, R= 0.0255 and wR= 0.0655 for 2104 observed reflections (I 〉 2a(/)). Single-crystal X-ray diffraction analysis revealed that compound 1 features a two-dimensional (2D) layered framework based on benzotriazole controlled dinuclear [Zn2(BTA)2] subunits. Furthermore, these 2D layers are threaded into a 3D supramolecular framework via the direction of intermolecular hydrogen bonds and π-π interactions. In addition, the thermal stability and fluorescence property of compound 1 were also investigated.展开更多
A kind of Levextrel resin separation process was developed for separation ofindium (III), gallium (III), and zinc (II) from aqueous sulfate solution with Levextrel resincontaining di(2-ethylhexyl) phosphoric acid (CL-...A kind of Levextrel resin separation process was developed for separation ofindium (III), gallium (III), and zinc (II) from aqueous sulfate solution with Levextrel resincontaining di(2-ethylhexyl) phosphoric acid (CL-P 204). The aim of the research is to collectpreliminary results for a pilot-scale production. Properties of adsorbing indium (III), gallium(III), and zinc (II) from sulfate solution with the Levextrel resin were first studied by batchoperation and column operation. The optimum pH, adsorption capacities and concentrations ofstripping agents for indium (III), gallium (III) were tested. The separation order of indium (III),gallium (III), and zinc (II) from sulfate solution with CL-P 204 Levextrel resin was found thatindium (III) could be first separated by adsorbing at the acidity of 1.0 mol/L whereas gallium (III)and zinc (II) could not, and they were adsorbed together by adsorbing at pH =2.8, then separatedfrom each other by stripping with 0.1 and 0.5 mol/L hydrochloric acid, respectively. The recoveriesof three metal ions were all higher than 99 percent. The cyclic properties of this resin are well.展开更多
Static second-order nonlinear optical effects of amino acid zinc(II) porphyrins 1, 2, 3 and 4 were calculated by the TDHF/PM3 method based on the molecular structures optimized at the semiempirical PM3 quantum chemi...Static second-order nonlinear optical effects of amino acid zinc(II) porphyrins 1, 2, 3 and 4 were calculated by the TDHF/PM3 method based on the molecular structures optimized at the semiempirical PM3 quantum chemistry level, showing due to the cancellation of symmetric center, these amino acid zinc(II) porphyrins exhibit second order nonlinear optical response. The analysis of β components indicated that these amino acid zinc(II) porphyrins are of multipola- rizabilities, and they may be ascribed as the “mixture” of octupolar and dipoar molecules with ||βJ=3||/||βJ=1|| ≈ 5. It is found that there are no significant differences between the static β values of non-chiral and chiral amino acid zinc(II) porphyrins. However, the βxyz component, which is quite important to quadratic macroscopic χ (2) susceptibility of chiral material, is increased significantly with the increase of side chain group of amino acids.展开更多
This is a review article including our recent results and some previous photo functional hybrid system having potential applications for environmental ion sensing. We have prepared several new and known chiral Schiff ...This is a review article including our recent results and some previous photo functional hybrid system having potential applications for environmental ion sensing. We have prepared several new and known chiral Schiff base Zn(II) complexes and measured (and also calculated) absorption and fluorescence spectra for sole complexes. After assembling hybrid systems with 1,3,3-trime- thylindolino-6’-nitrobenzopyrylospiran (SP) in methanol solutions, we measured spectral changes before and after alternate irradiation of UV and visible light. Intensity of fluorescence spectra for pale yellow Zn(II) complexes (λem = 450 nm, λex = 270 and 360 nm) was quenched by colorless SP (λem = 533 nm, λex = 612 nm). After UV light irradiation to form purple merocyanine (MC), photoisomerization resulted in changes of the intensity of absorption spectra as well as fluorescence spectra. Thus the hybrid systems could successfully act as molecular logic circuit by input (excitation by light) and output (intensity of fluorescence peaks). Moreover, we investigated concentration dependence of doped Zn(II) and Cu(II) ions to confirm quenching of intensity of fluorescence peaks by Zn(II) and Cu(II) MC complexes for metal ion sensing in solutions.展开更多
Poly(acrylamide-acrylic acid-dimethyl amino ethylmethacrylate), p(AM-AA-DMAEM) and Poly(acrylamide-acrylic acid)-ethylene diamine tetracetic acid disodium, p(AM-AA)-EDTANa2 were prepared by gamma radiation-induced tem...Poly(acrylamide-acrylic acid-dimethyl amino ethylmethacrylate), p(AM-AA-DMAEM) and Poly(acrylamide-acrylic acid)-ethylene diamine tetracetic acid disodium, p(AM-AA)-EDTANa2 were prepared by gamma radiation-induced template polymerization technique. The prepared polymeric materials were used for the sorption of Ga(III), Cu(II), Ni(II) and Zn(II) in aqueous solution. The effect of pH, weight of resins, metal ion concentrations and contact time on the sorption of these metal ions were studied.展开更多
基金supported by the Science and Technology Research Projects of the Education Department of Jilin Province (No. 2011. 459)
文摘A new metal-organic complex Zn2(cbba)4(phen)2 (Hcbba = 2-(4'chlorine-ben- zoyl)benzoic acid, phen = 1,10-phenanthroline) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR, fluorescence spectrum and single-crystal X-ray diffraction. The compound crystallizes in orthorhombic, space group Pbcn with a = 12.0821(II), b = 18.3140(17), c = 30.961(3) A, V= 6850.7(11) A^3, C80H48C14N4O12Zn2, Mr= 1529.76, Dc = 1.483 g/cm^3,μ(MoKa) = 0.925 mm^-1, F(000) = 3120, Z = 4, the final R = 0.0559 and wR = 0.1146 for 3963 observed reflections (I〉 2σ(I)). In the crystal structure, the zinc atom is five-coordinated with three carboxylate oxygen atoms from three different cbba ligands and two nitrogen atoms from the phen ligand, showing a distorted square-pyramidal geometry. Furthermore, it exhibits a 3D supramolecular network through π-π interactions and shows yellow photoluminescent property at room temperature.
基金Supported by the Science and Technology Research Projects of the Education Office of Jilin Province (No. 2009. 272)
文摘A new dinuclear complex [Zn(dpa)(bipy)(H2O)]2 (dpa = 2,2'-diphenic acid, bipy = 2,2'-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR, fluorescence spectrum and single-crystal X-ray diffraction. The complex crystallizes in monoclinic, space group P21/c with a = 10.960(2), b = 9.4841(18), c = 20.599(4), β = 104.452(3)o, V = 2073.4(7)3, C48H36N4O10Zn2, Mr = 959.55, Dc = 1.537 g/cm3, μ(MoKα) = 1.225 mm-1, F(000) = 984, Z = 2, the final R = 0.0364 and wR = 0.0843 for 2788 observed reflections (I 〉 2σ(I)). In the crystal structure, the zinc atom is five-coordinated with two carboxylate oxygen atoms from different dpas, one coordinated water molecule and two nitrogen atoms from bipy ligands, showing a slightly distorted triangular bipyramidal geometry. Furthermore, it exhibits a zero-dimensional network structure with a sixteen-membered ring and shows yellow photoluminescent property at room temperature.
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.
基金This work was financed by the National Key Fundamental Research Program of China.
文摘A new zinc(II) complex, Zn(2-NH2py)2Br2 (py=pyridine), has been synthesized, and its molecular structure has been confirmed by IR, elemental analysis and -ray crystal structure analysis. Its space group is P21/n with Mr=413.43 (C10H12Br2N4Zn), a=7.435(2), b=12.865(3), c=14.186(4)? b=94.08(2)? V=1353.5(5) 3, Z=4, Dc=2.029 g/cm3, F(000)=328, ?2.378mm-1, R=0.0283, wR=0.0501. The total observed reflections with I≥2?I) were 5314, of which the independent reflections were 3106. The complex structure contains a distorted tetrahedron formed by four atoms coordinated to zinc atom, namely two bromide atoms and two nitrogen atoms. The two ZnBr bond lengths within one molecule, 2.3763(6) and 2.4002(5)? respectively, are not equal; and so are the two ZnN bond lengths, which are 2.031(2) and 2.044(2)?respectively. The calculation results using PM3 method through MOPAC software package in Chem 3D show that its first molecular hyperpolarizability b value is 5.210-30esu, which is comparable with that of p-nitroaniline. No bulk SHG effect has been detected due to the centrosymmetric space group.
文摘Two novel coordination compounds, [Zn(L)2(OOCH)2] (1) and [Zn(L)3(OCHO)](OCHO)]·H2O (2) (where L = 2-isopropylimidazole, C6H10N2) have been prepared by reaction of 2-isopropylimidazole with zinc(II) formate at room temperature using toluene as solvent. These compounds were characterized by elemental and thermal analyses, IR, 1HNMR and 13CNMR spectroscopies, single crystal X-ray diffraction and DFT studies. The Zn centers in 1 and 2 adopt pseudo-tetrahedral coordination geometries. Compound 1 crystallizes in the monoclinic system P2/c space group whereas compound 2 crystallizes in the P-1 space group of the triclinic crystal system. Several types of hydrogen intra-/intermolecular interactions are observed in these materials and extend into a two-dimensional leaf like network in 1 and a two-dimensional lattice of rectilinear pillars in 2. Compounds 1 and 2 were also optimized and their frontier molecular orbitals, global reactivity descriptors, molecular electrostatic potential, natural bond orbitals were investigated using density functional theory (DFT). In fact the induced structural differences from complex 1 to complex 2 led to the reduction of the frontier molecular orbital energy gap by 1.338 eV and a decrease of the chemical hardness by 0.669 eV.
基金supported by the National Natural Science Foundation of China (No. 50778066)the National Science and Technology Support Program of China(No. 2006BAJ04A13)+1 种基金the Program for New Century Excellent Talents in University from the Ministry of Education of China (No. NCET-08-0181)the China Postdoctoral Science Foundation (No. 200801338)
文摘The biosorption potential of dried activated sludge as a biosorbent for zinc(Ⅱ) removal from aqueous solution was investigated.The effects of initial pH,contact time,initial zinc ion concentration,and adsorbent dosage on the biosorption processes were determined,and the equilibrium data were modeled by the Langmuir and Freundlich isotherms.The Langmuir isotherm model (R 2=0.999) was proved to fit the equilibrium data much better than the Freundlich isotherm model (R 2=0.918).The monolayer adsorption capacity of dried activated sludge for zinc(Ⅱ) was found to be 17.86 mg/g at pH of 5 and 25°C.The kinetic data were tested using pseudo firstand second-order models.The results suggested that the pseudo second-order model (R 2 〉 0.999) was better for the description of the adsorption behavior of zinc(Ⅱ) onto the dried activated sludge.Fourier transform infrared spectral analysis showed that the dominant mechanism of zinc(Ⅱ) biosorption onto the dried activated sludge was the binding between amide groups and zinc ions.
基金Supported by the foundation for Dr of Jianggangshan University (JZ10044)the NSF of Guangxi Province (No. 0832090)the NSF of the Education Committee of Guangxi Province (No. 201012MS203)
文摘A new 2D Zn(Ⅱ) coordination polymer [Zn(TAU)2]n (1, HTAU=2-aminoethane- sulfonic acid) constructed by 2-aminoethanesulfonic acid ligand has been hydrothermally synthesized by the reaction of Zn(CH3COO)2 and 2-aminoethanesulfonic acid with a 1:2 mole ratio and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy and thermogravimetric analysis. Crystal structural analysis reveals it crystallizes in monoclinic, space group P21/c with a=8.672(4), b=6.523(3), c=9.134(5) , β=115.441(5)°, V=466.6(4) 3, Mr=313.65, Z=2, Dc=2.232 Mg·m-3, F(000) =320, μ(MoKα)=3.091 mm-1, the final R=0.0358 and wR=0.0919 for 2026 observed reflections with Ⅰ 〉 2σ(Ⅰ). In the structure, each zinc(Ⅱ) ion is coordinated in a slightly distorted octahedron, and each μ3-TAU– acts as a bridge to bond three neighboring Zn(Ⅱ) ions to form an infinite 2D network structure.
基金Supported by the Natural Science Foundation of Henan Province (No. 102300410221)the Natural Science Foundation of Nanyang Normal University (No. ZX2010012)Project supported by the Young Core Instructor from the Education Commission of Henan Province
文摘Two novel mono-nuclear zinc(Ⅱ) complexes with oligoaniline-functionalized terpyridine ligands have been synthesized and verified by 1H-NMR,13C-NMR,Elemental Analysis (EA) and X-ray Diffraction (XRD). The UV-vis spectra show the ligand-centered (LC) π-π* transitions and intra-ligand charge transfer (1ILCT) transitions,and the 1ILCT band red-shifts with the increasing number of aromatic amine groups in the ligands. Complex [Zn(L1)2](PF6)2 with an aromatic amine group in ligand shows a strong emission peak at 523 nm in the MeCN solution at 293 K and a blue-shifted band at 517 nm in the alcoholic glass at 77 K. However,for complex [Zn(L2)2](PF6)2 containing aniline dimer modified ligand,no apparent emission can be observed in the MeCN solution at room temperature due to a PET non-radiative decay pathway. Both of them show multiplicate redox processes based on oligoaniline and terpyridine units. The shifts of redox potentials also reflect the D-A interactions between the oligoaniline units and [Zn(TPY)2]2+ core.
基金Supported by the Science and Technology Research Projects of the Education Office of Jilin Province (No.2011.459)
文摘A new complex [Zn1.5(dpa)1.5(bim)]2n(dpa = 2,2-diphenic acid,bim = benzimida-zole)1 has been hydrothermally synthesized and structurally characterized by elemental analysis,IR,fluorescence spectrum and single-crystal X-ray diffraction.The complex crystallizes in monoclinic,space group C2/c with a = 18.773(8),b = 16.560(7),c = 16.417(9),β = 94.737(9)o,V = 5086(4)3,C56H36N4O12Zn3,Mr = 1153.00,Dc = 1.506 g/cm3,μ(MoKα)= 1.472 mm1,F(000)= 2344,Z = 4,the final R = 0.0573 and wR = 0.1164 for 2968 observed reflections(I 2σ(I)).It exhibits a one-dimensional chain-like structure and shows luminescent property in the blue region.
基金Supported by the 973 Program of China(2011CBA00505)the"Strategic Priority Research Program"of the Chinese Academy of Sciences(XDA07070200,XDA09030102)the Science Foundation of Fujian Province(2006L2005)
文摘A new zinc(Ⅱ) compound, [Zn(BTA)(UCA)]n (1, HBTA = 1,2,3-benzotriazole, HUCA = 4-imidazoleacrylic acid), has been synthesized via the hydrothermal reactions of Zn(OAC)2.2H20, HBTA and HUCA. The crystal structure is of monoclinic, space group P21/c with a = 7.450(3), b = 18.911 (8), c = 9.198(4) A, fl = 94.317(8)°, V = 1292.2(9) A3, C12HgNsO2Zn, Mr = 320.63, Z = 4, Dc = 1.648 g/cm3, F(000) = 648,/z = 1.909 mm-1, R= 0.0255 and wR= 0.0655 for 2104 observed reflections (I 〉 2a(/)). Single-crystal X-ray diffraction analysis revealed that compound 1 features a two-dimensional (2D) layered framework based on benzotriazole controlled dinuclear [Zn2(BTA)2] subunits. Furthermore, these 2D layers are threaded into a 3D supramolecular framework via the direction of intermolecular hydrogen bonds and π-π interactions. In addition, the thermal stability and fluorescence property of compound 1 were also investigated.
文摘A kind of Levextrel resin separation process was developed for separation ofindium (III), gallium (III), and zinc (II) from aqueous sulfate solution with Levextrel resincontaining di(2-ethylhexyl) phosphoric acid (CL-P 204). The aim of the research is to collectpreliminary results for a pilot-scale production. Properties of adsorbing indium (III), gallium(III), and zinc (II) from sulfate solution with the Levextrel resin were first studied by batchoperation and column operation. The optimum pH, adsorption capacities and concentrations ofstripping agents for indium (III), gallium (III) were tested. The separation order of indium (III),gallium (III), and zinc (II) from sulfate solution with CL-P 204 Levextrel resin was found thatindium (III) could be first separated by adsorbing at the acidity of 1.0 mol/L whereas gallium (III)and zinc (II) could not, and they were adsorbed together by adsorbing at pH =2.8, then separatedfrom each other by stripping with 0.1 and 0.5 mol/L hydrochloric acid, respectively. The recoveriesof three metal ions were all higher than 99 percent. The cyclic properties of this resin are well.
基金This work was supported by the NNSFC (20476034 NSFC/HKUST43)+1 种基金 NSF of Guangdong Province (000489) and SRF for ROCS State Education Ministry.
文摘Static second-order nonlinear optical effects of amino acid zinc(II) porphyrins 1, 2, 3 and 4 were calculated by the TDHF/PM3 method based on the molecular structures optimized at the semiempirical PM3 quantum chemistry level, showing due to the cancellation of symmetric center, these amino acid zinc(II) porphyrins exhibit second order nonlinear optical response. The analysis of β components indicated that these amino acid zinc(II) porphyrins are of multipola- rizabilities, and they may be ascribed as the “mixture” of octupolar and dipoar molecules with ||βJ=3||/||βJ=1|| ≈ 5. It is found that there are no significant differences between the static β values of non-chiral and chiral amino acid zinc(II) porphyrins. However, the βxyz component, which is quite important to quadratic macroscopic χ (2) susceptibility of chiral material, is increased significantly with the increase of side chain group of amino acids.
文摘This is a review article including our recent results and some previous photo functional hybrid system having potential applications for environmental ion sensing. We have prepared several new and known chiral Schiff base Zn(II) complexes and measured (and also calculated) absorption and fluorescence spectra for sole complexes. After assembling hybrid systems with 1,3,3-trime- thylindolino-6’-nitrobenzopyrylospiran (SP) in methanol solutions, we measured spectral changes before and after alternate irradiation of UV and visible light. Intensity of fluorescence spectra for pale yellow Zn(II) complexes (λem = 450 nm, λex = 270 and 360 nm) was quenched by colorless SP (λem = 533 nm, λex = 612 nm). After UV light irradiation to form purple merocyanine (MC), photoisomerization resulted in changes of the intensity of absorption spectra as well as fluorescence spectra. Thus the hybrid systems could successfully act as molecular logic circuit by input (excitation by light) and output (intensity of fluorescence peaks). Moreover, we investigated concentration dependence of doped Zn(II) and Cu(II) ions to confirm quenching of intensity of fluorescence peaks by Zn(II) and Cu(II) MC complexes for metal ion sensing in solutions.
文摘Poly(acrylamide-acrylic acid-dimethyl amino ethylmethacrylate), p(AM-AA-DMAEM) and Poly(acrylamide-acrylic acid)-ethylene diamine tetracetic acid disodium, p(AM-AA)-EDTANa2 were prepared by gamma radiation-induced template polymerization technique. The prepared polymeric materials were used for the sorption of Ga(III), Cu(II), Ni(II) and Zn(II) in aqueous solution. The effect of pH, weight of resins, metal ion concentrations and contact time on the sorption of these metal ions were studied.