An infrared study of the interaction of γ-aminopropyl and gb-cyanoethyl derivatives of triethoxysilane with aerosil

Aerosil has been altered in surface properties by treatment with these compounds as vapors and in solution in benzene. The surface OH groups give rise to an organosiiyl layer that is stable up to high temperatures under vacuum. The condensation occurs mainly on surfaces not blocked by hydrogen bonds. Cyano groups linked to these layers provide a new type of adsorption center. The CN band at 2249 cm^–1 does not shift when various compounds are adsorbed.