Vladimir F. Sopin

Micellar, Liquid Crystalline and Polymer Systems Based on Surfactant and Polyethylene Imine as Nanoreactors for the Transfer of Phosphoryl Group

Abstract In the kinetic study of the hydrolysis of p-nitrophenyl alkyl chloromethylphosphonates and p-nitrophenyl diphenyl phosphate in the cationic surfactant-polyethylene imine-water system the dependence of the catalytic effect of the system on the nature of surfactants and substrates and the surfactant-polyethylene imine ratio was found. An appearance of liotropic mesophase in the surfactant -polymer solutions results in alteration in the reactivity of the substrates.

Cobalt(II)-8-mercaptoquinolines complexing in cobalt(II) hexacyanoferrate(II) gelatin-immobilized matrix materials

Complexing processes between CoII and 8-mercaptoquinoline, or its various alkyl- and aryl-substituted derivatives, in contact with Co2[Fe(CN)6]-gelatin-immobilized matrix materials, with aqueous solutions of corresponding ligands, have been studied. When R2 = Me or Ph, formation of CoII chelates having a 1:2 metal ion/singly deprotonated ligand is observed, whereas when R2 = H, formation of CoIII chelates having metal ion/singly deprotonated ligand 1:3 ratios occur.

Effect of Acid Modification on the Structure and Catalytic Activity of Aluminum Oxide

The effect of acetic acid introduced as modifying additive into active aluminum oxide on its structural characteristics is considered. A relationship is established between the structural characteristics, content and features of aprotic acid centers, and catalytic activity of the obtained catalysts in dehydration of methylphenylcarbinol.

The catalytic effect of the cationic surfactant-polyethylene imine-water system in the hydrolysis ofO-alkylO-p-nitrophenyl chloromethylphosphonates

The kinetics of the hydrolysis ofO-alkylO-p-nitrophenyl chloromethylphosphonates in the cationic surfactant—polyethylene imine—water system was studied. The catalytic effects of the nature of the surfactant and substrate and the surfactant—polyethylene imine ratio were found.

Copper(II)–8-mercaptoquinoline, copper(II)–5,8-dimercaptoquinoline and copper(II)–5-thiomethyl-8-mercaptoquinoline complexing in a copper(II)hexacyanoferrate(II) gelatin-immobilized matrix

Novel complexing processes in the CuII–8-mercaptoquinoline, CuII–5,8-dimercaptoquinoline and CuII–5-thiomethyl-8-mercaptoquinoline systems proceeding in the copper(II)hexacyanoferrate(II) gelatin-immobilized matrix in contact with aqueous solutions of the ligands indicated, have been studied. Under the conditions specified for complexing in the CuII–8-mercaptoquinoline system, only a monomeric water-insoluble coordination compound was formed. In the CuII–5,8-dimercaptoquinoline system, three coordination compounds were formed and, in the CuII–5-thiomethyl-8-mercaptoquinoline system, two such compounds were formed. Conversely, complexing in solution or solid phase results in the formation only coordination compounds in each of the system studied.

Kinetis of the reaction of alkaline hydrolysis of thiophosphates in micellar and hexagonal phases of the cetyldimethylethylammonium bromide/NaOH/water system.

Abstract Reactivity of O-p-nitrophenyl-O,O-dimethylthiophosphate ( A ), O-p-nitrophenyl-O,O-diethylthiophosphate ( B ) and O-p-nitrophenyl-O,O-dimethylphosphate ( C ) in alkaline hydrolysis in the cetyldimethylethylammonium bromide (CDAB)/NaOH/water system in micellar (MI) and and hexagonal (E) phases was investigated with the help of the spectrophotometrical method. Kinetic parameters of micellar-catalysed reactions (binding constants and rate constants in micellar pseudophase) are defined from kinetic dependence k obs = f(C CDAB ) in accordance with the pseudophase model. The formation of micelles results in maximum acceleration of the alkaline hydrolysis A and C by 6 and 8 times. The reaction becomes slower in an ordered E-phase in comparison with the Mi-phase for A, B and C by 16, 18 and 9 times, accordingly. The process is inhibited 3 and 5 times accordingly in comparison with aqueous alkaline hydrolysis in the E phase for A and B .

Copper(II)–1,2-bis(thiocarbamoyl)hydrazine and copper(II)–(1-carbamoyl-2-thiocarbamoyl)hydrazine complexing in copper(II)hexacyanoferrate(II) gelatin-immobilized matrix systems

The complex formation that occurs in gelatin-immobilized copper(II)hexacyanoferrate(II) matrices upon contact with aqueous alkaline (pH 12.0) solutions of 1,2-bis(thiocarbamoyl)hydrazine, H2NC(S)NHNHC(S)NH2 and 1-carbamoyl-2-(thiocarbamoyl)hydrazine, H2NC(O)NHNHC(S)NH2 has been studied. The reaction of each of these ligands with copper(II) is preceded by the destruction of copper(II)hexacyanoferrate(II) in an alkaline medium to form a polymeric copper(II) hydroxide, which is involved in the subsequent copper(II)–ligand complex formation. In both CuII–N ligand systems, two complex compounds are formed; the water-insoluble Cu2B2(H2O)2 dimer and a water-soluble product of tentative composition [CuB(HB)]− (H2B = ligand).

Filling of Castable Polyurethanes with Solid Wastes from Petrochemical Production

Physicochemical properties of castable polyurethanes based on polyethylene glycol adipate and mixture of 2,4- and 2,6-toluylene diisocyanate (NCO : OH molar ratio 1.6) and filled to 10 wt % with silica gel (waste from petrochemical production) were studied.

Dynamics of Changes in the Anionic Composition of Sodium Chloride Solutions in a Flow-through Electrolyzer

Products theoretically obtainable by electrochemical treatment of sodium chloride solutions in the dynamic mode are considered. Hydrated chlorine, and hypochlorous and hydrochloric acids are determined quantitatively by iodometric titration, spectrophotometry, and potentiometry. A comparative analysis is made of theoretical and experimental results obtained in determining chlorine-containing ions.

Colloidal Associates in the P-Octylphenol/NaOH / Water System and their Catalytic Properties at the Phosphorus Acid Decomposition

Abstract Using the tensiometric, potentiometric and conductivity methods we studied the association processes in the p-Octylphenol-NaOH-water system. We have used the spectrophotometric method and investigated the kinetic of decomposition of phosphorus acid esters in this system. We observed nonlinear reaction rate acceleration at the addition alkali. It may be explained in terms of increasing the positive charge of associates. This fact was confirmed by electroforetical experiments.