The ReceptorAgent Interaction
in the SO₂Tertiary Amine System

L. L. Vasil’eva*, F. N. Dul’tsev*, V. N. Kruchinin*, and S. M. Repinskii**

* Institute of Semiconductor Physics, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent’eva 13,
Novosibirsk, 630090 Russia
** Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia

Received October 3, 1995

Abstract—The dynamics of interaction of sulfur dioxide with receptor groups of polysiloxane films is studied
using ellipsometry and capacitance measurements. Polysiloxane layers with incorporated diethylpropylamine
groups are obtained by hydrolysis and polycondensation of diethylaminopropyltriethoxysilane. It is shown that
the interaction is reversible, and the layers thinner than 100 nm are optically homogeneous and are character-
ized by refractivity varying in the course of adsorption. The heat of the receptor–agent interaction is estimated
at ~13 kcal/mol. An analysis of adsorption–desorption and diffusion processes in the layer is carried out, and a
model of the process is proposed.

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