Hydrosilylation reactions in synthesis of surface chemical compounds

• Datum: 2001
• Hauptverfasser: Tertykh, V. A., Yanishpolskii, V. V., Bereza-Kindzerska, L. V., Pesek, J. J., Matyska, M. T.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2001
• Online Zugang: https://surfacezbir.com.ua/index.php/surface/article/view/49
• Назва журналу: Surface

With the combined use of a catalytic hydrosilylation reaction and sol-gel formation, immobilization of a number of unsaturated organic compounds (quinine, quinidine, cinchonine, cinchonidine, alprenolol, N-allylrhodanine, and hemin) was carried out on a silica surface. The structure of the compounds formed and the nature of their bonding with the surface were studied by DRIFT and NMR. spectroscopy. The concentrations of the olefins anchored to the surface layer of the silica matrix were estimated by a UV-spectroscopy method. A spectrophotometric method for the determination of =SiH group concentrations in solutions and on surfaces was developed. The method is based on the reduction of ammonium molybdate by silicon hydride groups and measuring the specific absorption at λ=710 nm of the blue solution of silicomolybdenum heteropolycomplex formed. The method allows for the determination microgram quantities of =SiH groups with a reasonable accuracy. Kinetic peculiarities of the hydrosilylation reaction between cinchonine and triethoxysilane in the presence of Speier’s catalyst have been studied in toluene and isopropyl alcohol by use of a spectrophotometric method. It was shown that the hydrosilylation reaction of functional olefin is complicated by transformation of the catalytic system and secondary processes occurring in the solvent medium, in particular the hydrolysis of =SiH groups.