The effects of GdCl_3 in flux on the loss of Gd,microstructure,mechanical properties,and corrosion resistance of Mg-Gd-Y-Zr(GW103K) scraps were investigated by ICE XRD,SEM and EDS.The results show that the loss of Gd ...The effects of GdCl_3 in flux on the loss of Gd,microstructure,mechanical properties,and corrosion resistance of Mg-Gd-Y-Zr(GW103K) scraps were investigated by ICE XRD,SEM and EDS.The results show that the loss of Gd in the alloy decreases with increasing GdCl_3 content in the flux,and the mechanism of GdCl_3 suppressing the loss of Gd was analyzed by thermodynamic theory.The optimal average mechanical properties could be obtained when the GdCl_3 content in the flux was 5% (mass fraction).Compared with the alloy only treated by JDMJ flux,theσ_b andσ_s of GW103K alloy were improved from 160.91 MPa and 133.88 MPa to 224.96 MPa and 157.91 MPa by 39.8%and 17.95%,respectively.Immersion test shows the corrosion rate of Mg-Gd-Y-Zr alloy refined by JDMJ+5.0%GdCl3 flux was decreased dramatically from 0.762 mg/(cm^2·d) to 0.437 mg/(cm^2·d)by 42.7%.GdCl_3 has no effect on the fracture pattern of GW103K alloy.展开更多
An efficient asymmetric alkenylation between 3-vinylindoles and isatin derivatives was developed under catalysis of a chiral copper complex.A series of optically active 3-alkenyl-3-substituted oxindoles were obtained ...An efficient asymmetric alkenylation between 3-vinylindoles and isatin derivatives was developed under catalysis of a chiral copper complex.A series of optically active 3-alkenyl-3-substituted oxindoles were obtained in excellent yields and stereoselectivities.The reaction mechanism was proposed and supported by DFT calculation.展开更多
The complex Eu(IB)_3(phen)·2H_2O was synthesized. The results show that the strong fluorescence emitting of 593 and 615 nm for Eu^(3+) in the Eu(IB)_3(phen) complex is related to the transitions (()~5D_0-()~7F_1)...The complex Eu(IB)_3(phen)·2H_2O was synthesized. The results show that the strong fluorescence emitting of 593 and 615 nm for Eu^(3+) in the Eu(IB)_3(phen) complex is related to the transitions (()~5D_0-()~7F_1) and (()~5D_0-()~7F_2,) respectively. A sensitive method for the determination of adenosine disodium triphosphate (ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(IB)_3(phen). In conditions of pH 6.7 HAc-NaAc buffer, λ_(ex)=273 nm and λ_(em)=615 nm, the linear range of the determination was 0.1～10 μg·ml^(-1) and the detection limit was 0.03 μg·ml^(-1) for ATP. The method has been applied to determine ATP in adenosine disodium triphosphate tablets samples with relative standard deviation of 2.18% and recovery of (98.4%～)104.0%.展开更多
The complex of Eu 3+ and Enoxacin(ENX) and Phen was synthesized. Its compositions is Eu(ENX)_3(phen)Cl_3·2H_2O. Its fluorescence spectra were studied. The results show that the strong fluorescence emitting of 592...The complex of Eu 3+ and Enoxacin(ENX) and Phen was synthesized. Its compositions is Eu(ENX)_3(phen)Cl_3·2H_2O. Its fluorescence spectra were studied. The results show that the strong fluorescence emitting of 592 and 616 nm for Eu 3+ in the Eu(ENX)_3(phen)Cl_3·2H_2O complex is related to the transitions 5D_0-7F_1 and 5D_0-7F_2 respectively. A sensitive method for the determination of adenosine triphosphate(ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(ENX)_3(phen)Cl_3·2H_2O. In conditions of pH 6.7 in HAc-NaAc buffer and λ_ ex=340 nm and λ_ em=616 nm, the linear range of the determination is 0.4～ 10 μg·ml -1 and the detection limit is 0.034 μg·ml -1 for ATP. The method was applied to determine ATP in adenosine disodium triphosphate injection samples with relative standard deviation of 212% and recovery of 94.8%～1037%.展开更多
A new complex Tb(IB)_3(phen)·2H_2O that gives off green fluorescence was synthesized. The results show that the strong fluorescence emitting of 490 and 545 nm for Tb 3+ in the Tb(IB)_3(phen)·2H_2O complex is...A new complex Tb(IB)_3(phen)·2H_2O that gives off green fluorescence was synthesized. The results show that the strong fluorescence emitting of 490 and 545 nm for Tb 3+ in the Tb(IB)_3(phen)·2H_2O complex is related to the transitions 5D_4-7F_6 and 5D_4-7F_5, respectively. The results indicate that the complex is concentrated on the nuclei regions in the section of onion toot tip tissues and the nuclei are high lighted under fluorescent microscope. It is possible that the Tb(IB)_3(phen)·2H_2O complex can be developed as a fluorescent dye in biological and pathological studies.展开更多
A new complex La(ENX)_3Cl_3·2H_2O was synthesized. The interaction between La-Enoxacin complex and bovine serum albumins (BSA) were studied by fluorescence and UV-Vis absorption spectra. The research results indi...A new complex La(ENX)_3Cl_3·2H_2O was synthesized. The interaction between La-Enoxacin complex and bovine serum albumins (BSA) were studied by fluorescence and UV-Vis absorption spectra. The research results indicate that the combination reaction of them is a single static quenching process, La-Enoxacin complex strongly bound BSA, the equilibrium constant K_0=1.45×107 L·mol -1 (at 25 ℃). The shortest binding distance(r) and energy transfer efficiencies(E) between donor (BSA) and acceptor (La-Enoxacin) obtained by Frster′s nonradiative energy transfer mechanism are as follows, r=4.07 nm, E=0.118. The hydrophobic force plays major role in the reaction.展开更多
A new coordination polymer,[Co2(L)2(H2O)2]n·H2O(1,H2L?=?5-(1H-1,2,4-triazol-1-yl)-1,3-benzenedicarboxylic acid),was constructed by hydrothermal condition reaction of Co(NO3)2·6H2O and H2L at the pH value of ...A new coordination polymer,[Co2(L)2(H2O)2]n·H2O(1,H2L?=?5-(1H-1,2,4-triazol-1-yl)-1,3-benzenedicarboxylic acid),was constructed by hydrothermal condition reaction of Co(NO3)2·6H2O and H2L at the pH value of 5.6.The as-prepared complex 1 was characterized by elemental analysis,IR and single-crystal X-ray diffraction.Furthermore,a green hand grinding technique has been implemented to reduce the particle size of complex 1 to generate nanoscale 1(denoted as nano 1 hereafter)with spherical morphology.Furthermore,the treatment of the compound on anxiety and insomnia was evaluated.Firstly,the ELISA was used to detect the content of serotonin,gamma-aminobutyric acid in the brain.Besides,the Rat sleep phase detection was determined by pentobarbital synergistic sleep experiment.展开更多
基金Project(2007CB613701)supported by the National Basic Research Program of ChinaProject(2006BAE04B07-2)supported by theNational Key Technology R&D Program of ChinaProject(08XD14020)supported by the Program of Shanghai Subject Chief Scientist
文摘The effects of GdCl_3 in flux on the loss of Gd,microstructure,mechanical properties,and corrosion resistance of Mg-Gd-Y-Zr(GW103K) scraps were investigated by ICE XRD,SEM and EDS.The results show that the loss of Gd in the alloy decreases with increasing GdCl_3 content in the flux,and the mechanism of GdCl_3 suppressing the loss of Gd was analyzed by thermodynamic theory.The optimal average mechanical properties could be obtained when the GdCl_3 content in the flux was 5% (mass fraction).Compared with the alloy only treated by JDMJ flux,theσ_b andσ_s of GW103K alloy were improved from 160.91 MPa and 133.88 MPa to 224.96 MPa and 157.91 MPa by 39.8%and 17.95%,respectively.Immersion test shows the corrosion rate of Mg-Gd-Y-Zr alloy refined by JDMJ+5.0%GdCl3 flux was decreased dramatically from 0.762 mg/(cm^2·d) to 0.437 mg/(cm^2·d)by 42.7%.GdCl_3 has no effect on the fracture pattern of GW103K alloy.
基金support from the National Natural Science Foundation of China(No.21772185)supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB20000000).
文摘An efficient asymmetric alkenylation between 3-vinylindoles and isatin derivatives was developed under catalysis of a chiral copper complex.A series of optically active 3-alkenyl-3-substituted oxindoles were obtained in excellent yields and stereoselectivities.The reaction mechanism was proposed and supported by DFT calculation.
文摘The complex Eu(IB)_3(phen)·2H_2O was synthesized. The results show that the strong fluorescence emitting of 593 and 615 nm for Eu^(3+) in the Eu(IB)_3(phen) complex is related to the transitions (()~5D_0-()~7F_1) and (()~5D_0-()~7F_2,) respectively. A sensitive method for the determination of adenosine disodium triphosphate (ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(IB)_3(phen). In conditions of pH 6.7 HAc-NaAc buffer, λ_(ex)=273 nm and λ_(em)=615 nm, the linear range of the determination was 0.1～10 μg·ml^(-1) and the detection limit was 0.03 μg·ml^(-1) for ATP. The method has been applied to determine ATP in adenosine disodium triphosphate tablets samples with relative standard deviation of 2.18% and recovery of (98.4%～)104.0%.
文摘The complex of Eu 3+ and Enoxacin(ENX) and Phen was synthesized. Its compositions is Eu(ENX)_3(phen)Cl_3·2H_2O. Its fluorescence spectra were studied. The results show that the strong fluorescence emitting of 592 and 616 nm for Eu 3+ in the Eu(ENX)_3(phen)Cl_3·2H_2O complex is related to the transitions 5D_0-7F_1 and 5D_0-7F_2 respectively. A sensitive method for the determination of adenosine triphosphate(ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(ENX)_3(phen)Cl_3·2H_2O. In conditions of pH 6.7 in HAc-NaAc buffer and λ_ ex=340 nm and λ_ em=616 nm, the linear range of the determination is 0.4～ 10 μg·ml -1 and the detection limit is 0.034 μg·ml -1 for ATP. The method was applied to determine ATP in adenosine disodium triphosphate injection samples with relative standard deviation of 212% and recovery of 94.8%～1037%.
文摘A new complex Tb(IB)_3(phen)·2H_2O that gives off green fluorescence was synthesized. The results show that the strong fluorescence emitting of 490 and 545 nm for Tb 3+ in the Tb(IB)_3(phen)·2H_2O complex is related to the transitions 5D_4-7F_6 and 5D_4-7F_5, respectively. The results indicate that the complex is concentrated on the nuclei regions in the section of onion toot tip tissues and the nuclei are high lighted under fluorescent microscope. It is possible that the Tb(IB)_3(phen)·2H_2O complex can be developed as a fluorescent dye in biological and pathological studies.
文摘A new complex La(ENX)_3Cl_3·2H_2O was synthesized. The interaction between La-Enoxacin complex and bovine serum albumins (BSA) were studied by fluorescence and UV-Vis absorption spectra. The research results indicate that the combination reaction of them is a single static quenching process, La-Enoxacin complex strongly bound BSA, the equilibrium constant K_0=1.45×107 L·mol -1 (at 25 ℃). The shortest binding distance(r) and energy transfer efficiencies(E) between donor (BSA) and acceptor (La-Enoxacin) obtained by Frster′s nonradiative energy transfer mechanism are as follows, r=4.07 nm, E=0.118. The hydrophobic force plays major role in the reaction.
文摘A new coordination polymer,[Co2(L)2(H2O)2]n·H2O(1,H2L?=?5-(1H-1,2,4-triazol-1-yl)-1,3-benzenedicarboxylic acid),was constructed by hydrothermal condition reaction of Co(NO3)2·6H2O and H2L at the pH value of 5.6.The as-prepared complex 1 was characterized by elemental analysis,IR and single-crystal X-ray diffraction.Furthermore,a green hand grinding technique has been implemented to reduce the particle size of complex 1 to generate nanoscale 1(denoted as nano 1 hereafter)with spherical morphology.Furthermore,the treatment of the compound on anxiety and insomnia was evaluated.Firstly,the ELISA was used to detect the content of serotonin,gamma-aminobutyric acid in the brain.Besides,the Rat sleep phase detection was determined by pentobarbital synergistic sleep experiment.
