CdS/NiS nanocomposites were synthesized by electrochemical method. Ni and Cd is one of the important II-VI semiconducting materials with a direct band gap of 3.26 eV which finds applications in electrical conductivity...CdS/NiS nanocomposites were synthesized by electrochemical method. Ni and Cd is one of the important II-VI semiconducting materials with a direct band gap of 3.26 eV which finds applications in electrical conductivity and photo-catalysis. The synthesized nanocomposites were characterized by BET, UV-VIS, XRD, FE-SEM (EDAX) techniques. X-Ray diffraction (XRD) reveals crystallite size to be 23.22 nm which was calculated using Williamson-Hall (W-H) plot method. The energy of the band gap for CdS/NiS could be thus estimated to be 3.26 eV. The photocatalytic activity of the sample was evaluated by the degradation of textile dye methylene Blue (MB) in aqueous solutions under UV radiation. Hydrogen energy is regarded as a promising alternative in terms of energy conversion and storage. Hydrogen Evolution Reaction (HER) was carried out in both visible light and UV light by using Hydrazine (N<sub>2</sub>H<sub>4</sub>H<sub>2</sub>O) in the presence of CdS/NiS nanocomposite. The synthesized photocatalyst shows applicable performance for kinetics of Hydrogen Evolution Reaction (HER) in Visible light and UV light. The decomposition of hydrazine (N<sub>2</sub>H<sub>4</sub>H<sub>2</sub>O) proceeded rapidly to generate free hydrogen rich gas through OH radical contact with CdS/NiS nanocomposite at room temperature. The rate of HER is limited by either proton adsorption onto an active site or evolution of formed hydrogen from the surface. A high Tafel slope is indicative of proton adsorption as the rate limiting step, while a lower Tafel slope (20 - 45 mV) indicates that the evolution of molecules hydrogen from the catalyst is rate limiting. In the present case the Tafel slopes for visible light 23.5 mV and 42.5 mV for UV light. Blank experiments show poor activity for HER <em>i.e.</em> 10.1 - 13.5 mV.展开更多
PhCH2)3Sn·(O2CC5H4N)·(H2O)]n was synthesized by the reaction of 4-pyridine car-boxylic acid with the tribenzyltin o xide and was characterized by IR,1 H NMR and MS.Its crystal structure was determined by X-r...PhCH2)3Sn·(O2CC5H4N)·(H2O)]n was synthesized by the reaction of 4-pyridine car-boxylic acid with the tribenzyltin o xide and was characterized by IR,1 H NMR and MS.Its crystal structure was determined by X-ray single crystal diffraction.The crystal belongs to monoclinic.The space group P21 /c with unit cell parameters a=1.2241(8)nm,b=0.9660(6)nm,c=2.3708(15)nm,β=102.722(12)°,V=2.734(3)nm3,Z =4,Dc=1.298g·cm-3 .In crystal,the tin atom rendered five-coordinate in a trigo nal bipyramidal structure which is b ridged by 4-pyridine carboxy-late into one-dimensional chain polymers.展开更多
In order to investigate the Magnetic Behavior of Compounds,the Variable —temperature magnetic susceptibility data of the title compounds(I:[Cu(C6H8O4)(C7H6N2)2H2O]∞) and(II:[Cu(C4H4O4)(C7H6N2)2 H2O]∞) were recorded...In order to investigate the Magnetic Behavior of Compounds,the Variable —temperature magnetic susceptibility data of the title compounds(I:[Cu(C6H8O4)(C7H6N2)2H2O]∞) and(II:[Cu(C4H4O4)(C7H6N2)2 H2O]∞) were recorded and discussed quantitatively based on to Ising’s model and particle swarm optimization(PSO).J≈-1.3cm-1,which shows that there is a weak interaction between two Cu(II) ions in the title compounds.It can be interpreted with Kahn’s approximate molecular orbital model.Room-temperature magnetic moment(2.150μB) is larger than pure-spin magnetic moment(1.732μB) and g is larger than ge(2.002),which comfirms the existence of spin-orbit coupling in the compounds.展开更多
A new organic dye, trans-4-[4'-(N-hydroxyethyl-N-methylamino)styryl]-N-methylpyridinium p-toluene sulfonate (HMASPS) has been synthesized and its structure has been determined. Pumped with a 1064 nm, 50 ps laser p...A new organic dye, trans-4-[4'-(N-hydroxyethyl-N-methylamino)styryl]-N-methylpyridinium p-toluene sulfonate (HMASPS) has been synthesized and its structure has been determined. Pumped with a 1064 nm, 50 ps laser pulses, 0.05 mol/L HMASPS/DMF solution showed the two-photon pumped (TPP) output/input efficiency of 8.4% which is higher than that of trans-4-[p-(N-hydroxyethyl-N-methylamino) styryl]-N-methylpyridinium iodide (ASPI)(1) at the same pump level.展开更多
A novel Co(II) coordination polymer bridged by 1,2,4,5-benzene-tetracarboxylate is solvothermally syn- thesized, which possesses one-dimensional chain structure. The complex crystallizes in the triclinic crystal syste...A novel Co(II) coordination polymer bridged by 1,2,4,5-benzene-tetracarboxylate is solvothermally syn- thesized, which possesses one-dimensional chain structure. The complex crystallizes in the triclinic crystal system, P1 space group, a = 0.9610(1) nm, b = 0.9684(1) nm, c = 0.7924(1) nm, α = 96.695(9)°, β = 102.741(6)°, γ = 116.551(5)°, V = 0.6236(2) nm3, Z = 2, R1 = 0.0342, wR2 = 0.0990. The surface photovoltage spectra measurement shows that the title com- plex exhibits obvious photovoltage response in the 300—800 nm regions. The variable temperature susceptibility reveals that the complex possesses weak antiferromagnetic property.展开更多
文摘CdS/NiS nanocomposites were synthesized by electrochemical method. Ni and Cd is one of the important II-VI semiconducting materials with a direct band gap of 3.26 eV which finds applications in electrical conductivity and photo-catalysis. The synthesized nanocomposites were characterized by BET, UV-VIS, XRD, FE-SEM (EDAX) techniques. X-Ray diffraction (XRD) reveals crystallite size to be 23.22 nm which was calculated using Williamson-Hall (W-H) plot method. The energy of the band gap for CdS/NiS could be thus estimated to be 3.26 eV. The photocatalytic activity of the sample was evaluated by the degradation of textile dye methylene Blue (MB) in aqueous solutions under UV radiation. Hydrogen energy is regarded as a promising alternative in terms of energy conversion and storage. Hydrogen Evolution Reaction (HER) was carried out in both visible light and UV light by using Hydrazine (N<sub>2</sub>H<sub>4</sub>H<sub>2</sub>O) in the presence of CdS/NiS nanocomposite. The synthesized photocatalyst shows applicable performance for kinetics of Hydrogen Evolution Reaction (HER) in Visible light and UV light. The decomposition of hydrazine (N<sub>2</sub>H<sub>4</sub>H<sub>2</sub>O) proceeded rapidly to generate free hydrogen rich gas through OH radical contact with CdS/NiS nanocomposite at room temperature. The rate of HER is limited by either proton adsorption onto an active site or evolution of formed hydrogen from the surface. A high Tafel slope is indicative of proton adsorption as the rate limiting step, while a lower Tafel slope (20 - 45 mV) indicates that the evolution of molecules hydrogen from the catalyst is rate limiting. In the present case the Tafel slopes for visible light 23.5 mV and 42.5 mV for UV light. Blank experiments show poor activity for HER <em>i.e.</em> 10.1 - 13.5 mV.
文摘PhCH2)3Sn·(O2CC5H4N)·(H2O)]n was synthesized by the reaction of 4-pyridine car-boxylic acid with the tribenzyltin o xide and was characterized by IR,1 H NMR and MS.Its crystal structure was determined by X-ray single crystal diffraction.The crystal belongs to monoclinic.The space group P21 /c with unit cell parameters a=1.2241(8)nm,b=0.9660(6)nm,c=2.3708(15)nm,β=102.722(12)°,V=2.734(3)nm3,Z =4,Dc=1.298g·cm-3 .In crystal,the tin atom rendered five-coordinate in a trigo nal bipyramidal structure which is b ridged by 4-pyridine carboxy-late into one-dimensional chain polymers.
文摘In order to investigate the Magnetic Behavior of Compounds,the Variable —temperature magnetic susceptibility data of the title compounds(I:[Cu(C6H8O4)(C7H6N2)2H2O]∞) and(II:[Cu(C4H4O4)(C7H6N2)2 H2O]∞) were recorded and discussed quantitatively based on to Ising’s model and particle swarm optimization(PSO).J≈-1.3cm-1,which shows that there is a weak interaction between two Cu(II) ions in the title compounds.It can be interpreted with Kahn’s approximate molecular orbital model.Room-temperature magnetic moment(2.150μB) is larger than pure-spin magnetic moment(1.732μB) and g is larger than ge(2.002),which comfirms the existence of spin-orbit coupling in the compounds.
基金This tvork was supported by the grant for state key program of China by the National NaturalScience Foundation of China, al
文摘A new organic dye, trans-4-[4'-(N-hydroxyethyl-N-methylamino)styryl]-N-methylpyridinium p-toluene sulfonate (HMASPS) has been synthesized and its structure has been determined. Pumped with a 1064 nm, 50 ps laser pulses, 0.05 mol/L HMASPS/DMF solution showed the two-photon pumped (TPP) output/input efficiency of 8.4% which is higher than that of trans-4-[p-(N-hydroxyethyl-N-methylamino) styryl]-N-methylpyridinium iodide (ASPI)(1) at the same pump level.
基金This work was supported by the grants from State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter+1 种基金 the Chinese Academy of Sciences (CAS) and the Science Foundation of CAS and Fujian province (2002F014,
文摘A novel Co(II) coordination polymer bridged by 1,2,4,5-benzene-tetracarboxylate is solvothermally syn- thesized, which possesses one-dimensional chain structure. The complex crystallizes in the triclinic crystal system, P1 space group, a = 0.9610(1) nm, b = 0.9684(1) nm, c = 0.7924(1) nm, α = 96.695(9)°, β = 102.741(6)°, γ = 116.551(5)°, V = 0.6236(2) nm3, Z = 2, R1 = 0.0342, wR2 = 0.0990. The surface photovoltage spectra measurement shows that the title com- plex exhibits obvious photovoltage response in the 300—800 nm regions. The variable temperature susceptibility reveals that the complex possesses weak antiferromagnetic property.
