掺杂双(N-2-甲基苯基-水杨醛亚胺)合铜(II)配合物的碳糊电极电催化测量过氧化氢(英文)

The electrochemical behavior of a bis (N-2-methylphenyl-salicyldenaminato)copper (II) complex spiked in a carbon paste electrode (BMPSCu-CPE) and its electrocatalytic reduc-tion of H2 O2 were examined using cyclic voltammetry, chronoamperometry, and differen-tial pulse voltammetry. Cyclic voltammetry was used to study the redox properties of BMPSCu-CPE at various potential scan rates. The apparent charge transfer rate constant and the transfer coefficient for the electron transfer between BMPSCu and the carbon paste electrode (CPE) were 1.9 ± 0.1 s–1 and 0.43, respectively. BMPSCu-CPE had excel-lent electrocatalytic activity for H2 O2 reduction in 0.1 mol/L phosphate buffer solution (pH 5.0), and it decreased the overpotential by 300 mV as compared to CPE alone. The diffusion coefficient and kinetic parameters such as the heterogeneous catalytic electron transfer rate constant and electron transfer coefficient for the reduction of H2 O2 at the BMPSCu-CPE surface were also determined using electrochemical methods. Differential pulse voltammetry showed two linear dynamic ranges of 1.0–10.0 and 10.0–300.0 μmol/L and a detection limit of 0.63 μmol/L H2 O2. The BMPSCu-CPE has excellent repro-ducibility and long term stability, and it was successfully applied for the determination of H2 O2 in two pharmaceutical samples: an antiseptic solution and a hair dying cream.     

Anthraquinone Redox Relay for Dye‐Sensitized Photo‐electrochemical H2O2 Production

Anthraquinone (AQ) redox mediators are introduced to metal‐free organic dye sensitized photo‐electrochemical cells (DSPECs) for the generation of H₂O₂. Instead of directly reducing O₂ to produce H₂O₂, visible‐light‐driven AQ reduction occurs in the DSPEC and the following autooxidation with O₂ allows H₂O₂ accumulation and AQ regeneration. In an aqueous electrolyte, under 1 sun conditions, a water‐soluble AQ salt is employed with the highest photocurrent of up to 0.4 mA cm^?2 and near‐quantitative faradaic efficiency for producing H₂O₂. In a non‐aqueous electrolyte, under 1 sun illumination, an organic‐soluble AQ is applied and the photocurrent reaches 1.8 mA cm^?2 with faradaic efficiency up to 95 % for H₂O₂ production. This AQ‐relay DSPEC exhibits the highest photocurrent so far in non‐aqueous electrolytes for H₂O₂ production and excellent acid stability in aqueous electrolytes, thus providing a practical and efficient strategy for visible‐light‐driven H₂O₂ production.     

有机过氧化物热分解压力特性和安全性评价

本文采用密闭压力容器试验（ＣＰＶＴ）测定有机过氧化物的热分解过程,得到压力（Ｐ）时间（ｔ）曲线和压力变化速度（ｄＰ／ｄｔ） 时间（ｔ）曲线,根据曲线确定其分解的最大压力ＰＭ 和最大压力变化速度（ｄＰ／ｄｔ）Ｍ 值．利用ＰＭ×（ｄＰ／ｄｔ）Ｍ 结果对化合物的热分解反应激烈程度进行分类,它与热爆炸容器试验（ＴＥＶＴ）结果有良好的相关性．     

实验性动脉粥样硬化家兔抗氧化活力观察

目的:研究自由基在动脉粥样硬化过程中的作用,建立家兔动脉粥样硬化模型. 方法:试验组随着TC、LDL-C的上升,LPO由 0.3上升到2.12ΔD233/ml是对照组的14倍.结果:TC、LOL-C与LPO呈正(r=0.69,r=0.67,P=0.05),LPO升高,造成SOD、GSH-PX逐渐下降.结论:检测LPO、SOD 、GSH-PX对心脑血管病诊断、疗效评估和愈后有重要意义.     

Structure and conformational flexibility of hexamethyldiperoxacyclononane

3,3,6,6,9,9-Hexamethyl-1,2,4,5-tetraoxacyclononane, one of the most thermally stable organic peroxides, has been studied by X-ray structural analysis. Possible conformations of this compound have been calculated by the molecular mechanics method.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 110–112, January, 1995.     

Chemiluminescence of oxygen-free acetone solutions of dimethyldioxirane

The decomposition of dimethyldioxirane (1) in oxygen-free acetone solutions (46°C) is accompanied by chemiluminescence (CL) in the visible spectral region. The emitter of CL is triplet-excited methyl acetate (2 ^*(T)). For the decomposition of solutions of1 in acetone and deuterated dimethyldioxirane in acetone-D₆ the decay of CL follows the first-order kinetics, and the kinetic isotope effect is observed. Two mechanisms of the formation of2 ^*(T) are discussed: (a) chain-radical process and (b) isomerization of1 to2. Dedicated to Prof. W. Adam on the occasion of his 60th birthday. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 477–479, March, 1997.     

Pork fat peroxidation by gamma-irradiation

In this paper, pork fat peroxidation by γ-irradiation and the possible effects of oxygen, UV-irradiation and storage after the γ-irradiation have been investigated. It has been found that the level of peroxides in irradiated pork increases linearly with the increasing absorbed dose. The chemical yield of peroxides formed in the irradiated fat is about 4.2 and independent on the sample temperature or absorbed dose rate, but dependent on storage time of sample before γ-irradiation. The irradiated pork exhibits some unusual features as following: 1) the peroxide content in irradiated pork is higher than that in unirradiated one; 2) the peroxide content in irradiated pork increases gradually on storage and is essentially constant in unirradiated one, which is very useful for the detection of irradiated pork; 3) the further peroxidation in irradiated pork is much more susceptible to UV radiation than that in unirradiated pork.     

Formation of radicals during dimethyldioxirane decomposition

Thermal decomposition of dimethyldioxirane is followed by the formation of radicals registered by ESR spectroscopy using aC-phenyl-N-tert-butylnitronc spin trap. The intensity of the ESR signal increases linearly with increasing temperature; the dependence is extreme in character.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1552–1554, June, 1996.