Combined effect of linear and nonlinear nonspecific solvation on the position of the vibrational bands of an amino group of substituents of N-methyl phthalimide

This paper analyzes the experimental data on the effect of a binary CCL4-py ridine solution on the position of the IR absorption bands of the valence v ibrations of an amino group of two substituents of N-methyl phthalimide. On the basis of a quantitative study of the contributions of linear and nonli near nonspecific solvation in the formation of the indicated bands, the mic rostructure is established for a van der Waals complex of composition 1:1 b etween molecules of 3-amino-N-methylphthalimide and pyridine. The assumptio n formulated earlier is confirmed, that local nonlinear dipole-dipole inter actions play an important role in the processes of complex formation that t ake place in the liquid and gaseous states of the substances. (C) 1999 The Optical Society of America [S1070-9762(99)00407-8].