Investigation of adsorption-dissociation mechanism of organic molecules at solid-liquid interface using nonlinear optical molecular probing method

摘要

The great potential of nonlinear optical molecular probing method in accessing molecular level information about adsorption and reaction mechanism at solid-liquid interfaces, under real chemical condition, is demonstrated using the results of our experiments on the adsorption behavior of thionin(+) cations at the silica/CH3CN Interface. The study has revealed that thionin+ cations are deprotonated due to their strong interactions with the SiO- groups at the interface, thus generating more surface silanol groups (SiOH) and a neutral species thionin(0), which stays in the liquid phase due to the lack of strong interaction with the silica substrate. (C) 1999 Elsevier Science B.V. All rights reserved. [References: 21]