Two novel Cd(Ⅱ) coordination polymers, [Cd 2(C 10H 2O 8)\5(H 2O) 6] n (1) and [Cd 4(C 6H 4O 2N) 8(H 2O) 4] n (2) (C 10H 2O 8=1,2,4,5-benzenetetracarboxyl and C 6H 4O 2N=nicotinato), were hydrothermally synthesized an...Two novel Cd(Ⅱ) coordination polymers, [Cd 2(C 10H 2O 8)\5(H 2O) 6] n (1) and [Cd 4(C 6H 4O 2N) 8(H 2O) 4] n (2) (C 10H 2O 8=1,2,4,5-benzenetetracarboxyl and C 6H 4O 2N=nicotinato), were hydrothermally synthesized and characterized by X-ray diffraction of the single-crystal and fluorescence spectra. Complex 1 crystallizes in triclinic system, space group P1 with a=0.559 62(7) nm, b=0.777 58(6) nm, c=0.969 75(10) nm, α=111.981(5)°, β=101.649(6)°, γ=98.240(5)°, and Z=1. Final R=0.024 8(wR=0.078 5). Complex 2 belongs to orthorhombic system, space group Pbca with unit cell dimensions a=1.144 94(19) nm, b=1.209 69(6) nm, c=1.740 73(8) nm and Z=8. Final R=0.018 5(wR=0.034 8). Both the two complexes are coordination polymers with a two-dimensional infinite structure, the repeat unit is [Cd 2(C 10H 2O 8)(H 2O) 6] (1) and [Cd 4(C 6H 4O 2N) 8(H 2O) 4] (2) which are bridged by the ligands of 1,2,4,5-benzenetetracarboxyl(C 10H 2O 8) and nicotinato(NA), respectively. The two polymers show strong fluorescence with λ em=433 nm(λ ex=333 nm, 1) and λ em=423 nm(λ ex=330 nm, 2) in the solid state at room temperature. The emissions observed in the polymers are tentatively assigned to the ligands fluorescence(LLCT).展开更多
Zinc oxide nanostructure thin films were prepared on quartz slides via chemical vapour deposition(CVD). Various nanostructures such as nanorod, nanowires and surface-rough nanocubes, could be obtained under carefully ...Zinc oxide nanostructure thin films were prepared on quartz slides via chemical vapour deposition(CVD). Various nanostructures such as nanorod, nanowires and surface-rough nanocubes, could be obtained under carefully tuning experimental conditions. The surface-enhanced Raman scattering(SERS) character of these films was investigated by using 4-mercaptopyridine(4-MPY) as the probing molecule.展开更多
A novel Co（Ⅱ） coordination polymer was hydrothermally synthesized and characterized. The crystal crystallizes in the monoclinic system, space group C c with a =1.772 59（4） nm, b = 1.150 00（10） nm , c =2.452 76...A novel Co（Ⅱ） coordination polymer was hydrothermally synthesized and characterized. The crystal crystallizes in the monoclinic system, space group C c with a =1.772 59（4） nm, b = 1.150 00（10） nm , c =2.452 76（11） nm, β =92.723（3）°, V =4.994 3 nm 3, Z =4, R =0.080 9, wR =0.213 4. The polymer based on [Co（μ 4,4′ bipy）（4,4′ bipy） 2(（H 2O） 2] n linear chains was cross linked by the H bond bridge of Co—OH 2…4,4′ bipy—Co and π π stacking interaction, producing extended 2D ladder structure. The susceptibility of the polymer at variable temperature（2 0300 K） shows a weak antiferromagnetic interaction and implies that the polymer has the tendency of spin transition. Also, the result of surface photovoltage spectroscopy（SPS） reveals that the polymer has a significant photo electronic transferring property in UV Vis regions, which correspond to π π transition, L M charge transfer transition（shoulder） and d d transition of Co 2+ ion, respectively.展开更多
文摘Two novel Cd(Ⅱ) coordination polymers, [Cd 2(C 10H 2O 8)\5(H 2O) 6] n (1) and [Cd 4(C 6H 4O 2N) 8(H 2O) 4] n (2) (C 10H 2O 8=1,2,4,5-benzenetetracarboxyl and C 6H 4O 2N=nicotinato), were hydrothermally synthesized and characterized by X-ray diffraction of the single-crystal and fluorescence spectra. Complex 1 crystallizes in triclinic system, space group P1 with a=0.559 62(7) nm, b=0.777 58(6) nm, c=0.969 75(10) nm, α=111.981(5)°, β=101.649(6)°, γ=98.240(5)°, and Z=1. Final R=0.024 8(wR=0.078 5). Complex 2 belongs to orthorhombic system, space group Pbca with unit cell dimensions a=1.144 94(19) nm, b=1.209 69(6) nm, c=1.740 73(8) nm and Z=8. Final R=0.018 5(wR=0.034 8). Both the two complexes are coordination polymers with a two-dimensional infinite structure, the repeat unit is [Cd 2(C 10H 2O 8)(H 2O) 6] (1) and [Cd 4(C 6H 4O 2N) 8(H 2O) 4] (2) which are bridged by the ligands of 1,2,4,5-benzenetetracarboxyl(C 10H 2O 8) and nicotinato(NA), respectively. The two polymers show strong fluorescence with λ em=433 nm(λ ex=333 nm, 1) and λ em=423 nm(λ ex=330 nm, 2) in the solid state at room temperature. The emissions observed in the polymers are tentatively assigned to the ligands fluorescence(LLCT).
文摘Zinc oxide nanostructure thin films were prepared on quartz slides via chemical vapour deposition(CVD). Various nanostructures such as nanorod, nanowires and surface-rough nanocubes, could be obtained under carefully tuning experimental conditions. The surface-enhanced Raman scattering(SERS) character of these films was investigated by using 4-mercaptopyridine(4-MPY) as the probing molecule.
文摘A novel Co（Ⅱ） coordination polymer was hydrothermally synthesized and characterized. The crystal crystallizes in the monoclinic system, space group C c with a =1.772 59（4） nm, b = 1.150 00（10） nm , c =2.452 76（11） nm, β =92.723（3）°, V =4.994 3 nm 3, Z =4, R =0.080 9, wR =0.213 4. The polymer based on [Co（μ 4,4′ bipy）（4,4′ bipy） 2(（H 2O） 2] n linear chains was cross linked by the H bond bridge of Co—OH 2…4,4′ bipy—Co and π π stacking interaction, producing extended 2D ladder structure. The susceptibility of the polymer at variable temperature（2 0300 K） shows a weak antiferromagnetic interaction and implies that the polymer has the tendency of spin transition. Also, the result of surface photovoltage spectroscopy（SPS） reveals that the polymer has a significant photo electronic transferring property in UV Vis regions, which correspond to π π transition, L M charge transfer transition（shoulder） and d d transition of Co 2+ ion, respectively.
