N-Substituted-3-aminopropylsilsesquioxanes: synthesis,physicochemical properties,and application

Russian Chemical Bulletin - Synthesis and study of the physicochemical properties of silsesquioxanes modified with 3-aminopropyl, 2-aminoethyl-3-aminopropyl, and dithiooxamide groups was carried...     

Kinetics of acid-base interaction of octaphenyl-substituted tetraazaporphyrins with nitrogen-containing bases in a system benzene-dimethylsulfoxide

Effect of dimethylsulfoxide additives on the kinetics of acid-base interaction of octaphenyl-substituted tetraazaporphyrins with nitrogen-containing bases in benzene is studied. A strong effect of the solvent on the process rate and activation parameters is revealed. The relation of the molecular structure of the interacting molecules to their reactivity is demonstrated.

     

Effect of electrode material on impedance spectra of metal-polyethylene structures with carbon nanotubes

The effect of an electrode material on electrical properties of a composite material based on super-high-molecular polyethylene (SHMPE) filled with carbon nanotubes has been studied using impedance spectroscopy. Using the method of replacing the sample by an equivalent electric circuit, it has been found that, depending on the electrode material, a blocking barrier with high active resistance and a space charge region adjacent to it arise in the interface region. It has been shown that the barrier height is controlled by surface electronic states of SHMPE and weakly depends on the electron work function of metal electrodes (Bardeen barrier). The characteristic times of electrical relaxation characterizing bulk and interface regions of the composite under study have been determined.     

Synthesis and investigation of iron fullerene clusters

Iron fullerene clusters are prepared by plasma chemical synthesis and investigated using electron magnetic resonance. It is shown that these clusters can be prepared both by plasma chemical synthesis of fullerenes with iron and by mixing of a fullerene solution with a powder of iron nanoparticles coated with carbon shells. A liquid chromatographic technique is proposed for separating iron fullerence clusters.     

Effect of the fields of randomly spaced charged centers on the luminescence polarization

This paper considers the effect produced by randomly spaced charged centers in a crystal on the luminescence polarization associated with Jahn-Teller centers under conditions of uniaxial strain.     

Synthesis and surface structural characteristics of new polysiloxane xerogel

Pyridylethylaminopropylpolysiloxane xerogel (PEAPPSX) was synthesized by sol-gel technology. The composition of the substance was determined via elemental analysis and 1H NMR spectroscopy. The surface structural characteristics of the xerogel were determined by electron microscopy and low-temperature nitrogen sorption; thermal analysis was also performed. It was established that the content of functional groups in PEAPPSX was 2.43 mmol/g, and that xerogel is a mesoporous substance with a developed surface (121.71 m²/g).     

The influence of some triphenylantimony(V) catecholates and o‐amidophenolates on lipid peroxidation in vitro

A number of catecholates (complexes 1–3, 6) and o‐amidophenolates (complexes 4, 5) of triphenylantimony(V) was examined in the process of lipid peroxidation of liver homogenates and sperm of Russian sturgeon (Acipenser gueldenstaedti B.), and human red blood cells. It was shown that the influence of complexes 1–6 on lipid peroxidation process in model systems depends on the nature of redox‐active ligand and varies from weak anti‐ and pro‐oxidant (catecholates 1, 6) to pronounced antioxidant (catecholates and o‐amidophenolates 2–5). It was found that the complexes 2–5 are the more effective inhibitors of lipid peroxidation than standard antioxidant ionol. Copyright © 2012 John Wiley & Sons, Ltd.