The difference UV spectra and fluorescence of Bu2SnCl2 and ethylene bis (o-hydroxyphenylglycine) (EHPG), a ligand used previously for mimicking Fe3+ binding of transferrins, was first studied in Tris-HCl buffer soluti...The difference UV spectra and fluorescence of Bu2SnCl2 and ethylene bis (o-hydroxyphenylglycine) (EHPG), a ligand used previously for mimicking Fe3+ binding of transferrins, was first studied in Tris-HCl buffer solution (pH7.4). Difference UV spectral studies show that the binding of Bu2SnCl2 to EPHG takes twelve hours and gives rise to 1:1 complex. The binding constant for Bu2SnCl2-EHPG complex is estimated to be 1.65 X 10(3) M-1. Fluorescence studies also show an increase in intensity of EHPG after interaction with Bu2SnCl2.展开更多
The systems containing EHPG, EHPG-OCH3 and EHPG-NH-Ac and Tb(Ⅲ) ions were used to study chemiluminescence (CL) and electrochemiluminescence (ECL) processes. In the CL studies the Fenton system (Fe(Ⅱ)/(Ⅲ)-H2O2) was ...The systems containing EHPG, EHPG-OCH3 and EHPG-NH-Ac and Tb(Ⅲ) ions were used to study chemiluminescence (CL) and electrochemiluminescence (ECL) processes. In the CL studies the Fenton system (Fe(Ⅱ)/(Ⅲ)-H2O2) was used as a source of reactive oxygen species (ROS). Kinetic CL curves and CL spectral distributions were recorded. On the basis of the results obtained, it was demonstrated that Tb(Ⅲ) acted as a sensitizer. Similarly obtained CL decays in the systems of Fe(Ⅱ)/(Ⅲ)-EHPG (or its derivatives)-H2O2 and Fe(Ⅱ)/(Ⅲ)-EHPG (or its derivatives)-Tb(Ⅲ)-H2O2, independently on the Tb(Ⅲ) concentration, showed that the lanthanide ions did not influence the kinetics of the oxidation of EHPG (or its derivatives) in the Fenton systems. The CL intensity increased with the increasing concentration of Tb(Ⅲ) ions, which were the main emitters in the reaction systems. Spectrophotometric and luminescent studies of the systems before and after the additions of hydrogen peroxide proved that the excitation of the lanthanide ion was a result of energy transfer from the excited products of the oxidation of EHPG or its derivatives to the uncomplexed Tb(Ⅲ) ions. ECL was generated on the surface of a nonstructural modified aluminum electrode with the use of K2S2O8, H2O2 or KN3 as coreactants in aqueous solution. In these studies we employed Al electrodes covered with a 2-4 nm layer of Al2O3 doted with Tb(Ⅲ) or Dy(Ⅲ) ions. The electrodes were polarized using cathodic and anodic pulses of various amplitude and frequency. The relative ECL efficiencies were determined as a function of electric pulse parameters, electrolyte compositions and the thickness of barrier or porous layer of the Al2O3 electrode.展开更多
日前，佛吉亚宣布推出世界上第一套直接转换系统并在2015年法兰克福车展上亮相，该系统可将车辆排气余热转换为混合动力汽车的电能和直接驱动载货汽车的动力。该系统名为EHPG系统（Exhanst Heat Power Generation），其运转原理依据的是...日前，佛吉亚宣布推出世界上第一套直接转换系统并在2015年法兰克福车展上亮相，该系统可将车辆排气余热转换为混合动力汽车的电能和直接驱动载货汽车的动力。该系统名为EHPG系统（Exhanst Heat Power Generation），其运转原理依据的是Rankine循环。同发电方式类似，EHPG使用放置在排气流中的热交换器（蒸发器）发电。展开更多
基金the National Natural Science Foundation of China and Provincial Natural Foundation of Shanxi.
文摘The difference UV spectra and fluorescence of Bu2SnCl2 and ethylene bis (o-hydroxyphenylglycine) (EHPG), a ligand used previously for mimicking Fe3+ binding of transferrins, was first studied in Tris-HCl buffer solution (pH7.4). Difference UV spectral studies show that the binding of Bu2SnCl2 to EPHG takes twelve hours and gives rise to 1:1 complex. The binding constant for Bu2SnCl2-EHPG complex is estimated to be 1.65 X 10(3) M-1. Fluorescence studies also show an increase in intensity of EHPG after interaction with Bu2SnCl2.
基金Project supported by the grants of Polish Ministry of Science and Higher Education nr N N204 028236 and partly nr N N204 030935
文摘The systems containing EHPG, EHPG-OCH3 and EHPG-NH-Ac and Tb(Ⅲ) ions were used to study chemiluminescence (CL) and electrochemiluminescence (ECL) processes. In the CL studies the Fenton system (Fe(Ⅱ)/(Ⅲ)-H2O2) was used as a source of reactive oxygen species (ROS). Kinetic CL curves and CL spectral distributions were recorded. On the basis of the results obtained, it was demonstrated that Tb(Ⅲ) acted as a sensitizer. Similarly obtained CL decays in the systems of Fe(Ⅱ)/(Ⅲ)-EHPG (or its derivatives)-H2O2 and Fe(Ⅱ)/(Ⅲ)-EHPG (or its derivatives)-Tb(Ⅲ)-H2O2, independently on the Tb(Ⅲ) concentration, showed that the lanthanide ions did not influence the kinetics of the oxidation of EHPG (or its derivatives) in the Fenton systems. The CL intensity increased with the increasing concentration of Tb(Ⅲ) ions, which were the main emitters in the reaction systems. Spectrophotometric and luminescent studies of the systems before and after the additions of hydrogen peroxide proved that the excitation of the lanthanide ion was a result of energy transfer from the excited products of the oxidation of EHPG or its derivatives to the uncomplexed Tb(Ⅲ) ions. ECL was generated on the surface of a nonstructural modified aluminum electrode with the use of K2S2O8, H2O2 or KN3 as coreactants in aqueous solution. In these studies we employed Al electrodes covered with a 2-4 nm layer of Al2O3 doted with Tb(Ⅲ) or Dy(Ⅲ) ions. The electrodes were polarized using cathodic and anodic pulses of various amplitude and frequency. The relative ECL efficiencies were determined as a function of electric pulse parameters, electrolyte compositions and the thickness of barrier or porous layer of the Al2O3 electrode.
文摘日前，佛吉亚宣布推出世界上第一套直接转换系统并在2015年法兰克福车展上亮相，该系统可将车辆排气余热转换为混合动力汽车的电能和直接驱动载货汽车的动力。该系统名为EHPG系统（Exhanst Heat Power Generation），其运转原理依据的是Rankine循环。同发电方式类似，EHPG使用放置在排气流中的热交换器（蒸发器）发电。
