A novel method for the determination of captopril by spectrophotometer is described in this paper. The experiment is based on the fact that Fe（Ⅲ） is reduced to Fe（Ⅱ） by captopril, then the in sire formed Fe（Ⅱ...A novel method for the determination of captopril by spectrophotometer is described in this paper. The experiment is based on the fact that Fe（Ⅲ） is reduced to Fe（Ⅱ） by captopril, then the in sire formed Fe（Ⅱ） reacts with potassium ferricyanide to give the soluble prussian blue at pH 4.00, and its maximal adsorption wavelength （λmax） is 735 nm. Good linear relationship is obtained between the absorbance and the concentration of captopril in the wide range of 0.05-20 μg/mL. The linear regression equation is A = -0.04314 ＋ 0.11423C （μg/mL） with a correlation coefficient R = 0.9998. The detection limit （3σ/k） is 0.04 μg/mL, the molar absorption coefficient is 2.5×10^4 L/mol cm. By mensurating the absorbance of soluble prussian blue, the indirect determination of captopril can be obtained. This method has been successfully applied to determination of captopril in pharmaceutical samples. Analytical results obtained are satisfactory.展开更多
Some new benzimidazoles and benzoxazoles have been prepared under mild condition by oxidative cyclization of arylaldehyde witho-phenylenediamine ando-aminophenol using potassium ferricyanide as oxidant
A Microbial fuel cell(MFC)with metal free polymer/graphite electrodes(150 mm×150 mm)was constructed.The electrodes with flowing channels,which were different in roughness,were designed.No additional catalyst was ...A Microbial fuel cell(MFC)with metal free polymer/graphite electrodes(150 mm×150 mm)was constructed.The electrodes with flowing channels,which were different in roughness,were designed.No additional catalyst was coated on the electrode,therefore the MFC was cheaper and possessed good durability with high performance.The effect of roughness,K3Fe(CN)6 concentration and sprayed air on the performance of the constructed MFC was investigated.Results showed that the roughness of electrode can significantly affect the performance of MFC.The power density of MFC increased by 1.56 times owing to the arithmetic mean roughness which has increased by 1.41 times.With an increasing K3Fe(CN)6 concentration,the performance of MFC also improves.The MFC with K3Fe(CN)6 only(30 mM)showed the highest power density of 1260 mW/m2,which is by 21.4 times and 1.3 times higher than those of MFCs with spraying air only(59 mW/m2)and with K3Fe(CN)6+air(1005 mW/m2),respectively.This showed that the appropriate concentration of K3Fe(CN)6 can significantly improve the power density,while the air has a negative effect when it is sprayed onto K3Fe(CN)6 catholyte.A coulombic efficiency of 34.2%and an energy efficiency of 13.3%with a COD degradation rate of 73.5%were achieved with MFC using K3Fe(CN)6 only.The overpotentials of MFC were also calculated.It can be seen that both theηohmic andηconcentration were very low as compared to theηactivation,and theηconcentration can be ignored because its effect was less than 3 mV.The theoretical calculation suggested that with an increasing conversion rate of K3Fe(CN)6,the cathode potential decreased and reached 0.31 V at a conversion rate of 0.99.While the anode behaves differently for constant pH and changeable pH as the reaction progresses,which reveals that the buffer solution and removal of protons play an important role in maintaining the anode potential.展开更多
Introduction Thin-layer spectroelectrochemical method has many unique advantages, therefore this method has been widely applied and developed. Recently light transparent thinlayer spectroelectrochemical cells with var...Introduction Thin-layer spectroelectrochemical method has many unique advantages, therefore this method has been widely applied and developed. Recently light transparent thinlayer spectroelectrochemical cells with various types of structures have been reported at home and abroad with gold or platinum minigrids as the working electrode in most of展开更多
A novel bimetallic porphyrin complex salt, { [MnTPP（CHaOH）2]3Fe（CN）6}·13H2O （TPP = tetraphenylporphyrin）, has been synthesized and structurally characterized by X-ray diffraction analysis. The crystal is of...A novel bimetallic porphyrin complex salt, { [MnTPP（CHaOH）2]3Fe（CN）6}·13H2O （TPP = tetraphenylporphyrin）, has been synthesized and structurally characterized by X-ray diffraction analysis. The crystal is of trigonal, space group R-3 with a = b = 31.0618（10）, c = 11.8366（8）A, Z = 3, V = 9890.3（8）A^3, C144H134FeMn3N18O19, Mr = 2641.36, Dc = 1.330 g/cm^3, μ（MoKa） = 0.463 mm^-1, F（000） = 4131, R= 0.0525 and wR = 0.1382 for 3045 observed reflections （I 〉 2σ（I））. The title complex is composed of one [Fe（CN）6]^3- anion, three [MnTPP（CH3OH）2]^＋ cations and thirteen water molecules, which are connected by multiform hydrogen bonds leading to a 3D supramolecular network structure.展开更多
文摘A novel method for the determination of captopril by spectrophotometer is described in this paper. The experiment is based on the fact that Fe（Ⅲ） is reduced to Fe（Ⅱ） by captopril, then the in sire formed Fe（Ⅱ） reacts with potassium ferricyanide to give the soluble prussian blue at pH 4.00, and its maximal adsorption wavelength （λmax） is 735 nm. Good linear relationship is obtained between the absorbance and the concentration of captopril in the wide range of 0.05-20 μg/mL. The linear regression equation is A = -0.04314 ＋ 0.11423C （μg/mL） with a correlation coefficient R = 0.9998. The detection limit （3σ/k） is 0.04 μg/mL, the molar absorption coefficient is 2.5×10^4 L/mol cm. By mensurating the absorbance of soluble prussian blue, the indirect determination of captopril can be obtained. This method has been successfully applied to determination of captopril in pharmaceutical samples. Analytical results obtained are satisfactory.
文摘Some new benzimidazoles and benzoxazoles have been prepared under mild condition by oxidative cyclization of arylaldehyde witho-phenylenediamine ando-aminophenol using potassium ferricyanide as oxidant
基金The authors would like to thank the Federal Ministry of Education and Research(Bundesministerium für Bildung und Forschung),BMBF,Germany,for funding parts of this study under the contract No.02WER1317D.
文摘A Microbial fuel cell(MFC)with metal free polymer/graphite electrodes(150 mm×150 mm)was constructed.The electrodes with flowing channels,which were different in roughness,were designed.No additional catalyst was coated on the electrode,therefore the MFC was cheaper and possessed good durability with high performance.The effect of roughness,K3Fe(CN)6 concentration and sprayed air on the performance of the constructed MFC was investigated.Results showed that the roughness of electrode can significantly affect the performance of MFC.The power density of MFC increased by 1.56 times owing to the arithmetic mean roughness which has increased by 1.41 times.With an increasing K3Fe(CN)6 concentration,the performance of MFC also improves.The MFC with K3Fe(CN)6 only(30 mM)showed the highest power density of 1260 mW/m2,which is by 21.4 times and 1.3 times higher than those of MFCs with spraying air only(59 mW/m2)and with K3Fe(CN)6+air(1005 mW/m2),respectively.This showed that the appropriate concentration of K3Fe(CN)6 can significantly improve the power density,while the air has a negative effect when it is sprayed onto K3Fe(CN)6 catholyte.A coulombic efficiency of 34.2%and an energy efficiency of 13.3%with a COD degradation rate of 73.5%were achieved with MFC using K3Fe(CN)6 only.The overpotentials of MFC were also calculated.It can be seen that both theηohmic andηconcentration were very low as compared to theηactivation,and theηconcentration can be ignored because its effect was less than 3 mV.The theoretical calculation suggested that with an increasing conversion rate of K3Fe(CN)6,the cathode potential decreased and reached 0.31 V at a conversion rate of 0.99.While the anode behaves differently for constant pH and changeable pH as the reaction progresses,which reveals that the buffer solution and removal of protons play an important role in maintaining the anode potential.
基金Supported by the National Natural Science Foundation of China
文摘Introduction Thin-layer spectroelectrochemical method has many unique advantages, therefore this method has been widely applied and developed. Recently light transparent thinlayer spectroelectrochemical cells with various types of structures have been reported at home and abroad with gold or platinum minigrids as the working electrode in most of
基金the Natural Science Foundation of Gansu Province (3ZS041-A25-008)
文摘A novel bimetallic porphyrin complex salt, { [MnTPP（CHaOH）2]3Fe（CN）6}·13H2O （TPP = tetraphenylporphyrin）, has been synthesized and structurally characterized by X-ray diffraction analysis. The crystal is of trigonal, space group R-3 with a = b = 31.0618（10）, c = 11.8366（8）A, Z = 3, V = 9890.3（8）A^3, C144H134FeMn3N18O19, Mr = 2641.36, Dc = 1.330 g/cm^3, μ（MoKa） = 0.463 mm^-1, F（000） = 4131, R= 0.0525 and wR = 0.1382 for 3045 observed reflections （I 〉 2σ（I））. The title complex is composed of one [Fe（CN）6]^3- anion, three [MnTPP（CH3OH）2]^＋ cations and thirteen water molecules, which are connected by multiform hydrogen bonds leading to a 3D supramolecular network structure.
