INVESTIGATION OF SILICA SURFACE-CHEMISTRY BY LUMINESCENT PROBES METHOD

Spectroscopic indications of various adsorption states of aromatic compounds differing in the orbital nature of the excited electronic state - charge-transfer complexes, exciplexes, associates. and proton connection products - are determined. The relationship between the indications and the state of functional groups of the silica surface is elucidated. The concentration of chemisorption complexes on silica gel and aerosil surface is estimated. The applicability of fluorophore molecules as molecular probes of the surface is demonstrated. The assumption of a mosaic structure of the silica surface with alternation of hydroxylated and siloxane fragments is substantiated.