Among short-range molecular interactions, the molecular complexes formed by
hydrogen bond attracted the attention to understand the nature of the bond
. Theoretical studies concluded that redistribution of charges due to polar
ization and charge transfer effects accompanies the molecular interaction.
This phenomenon of charge redistribution can be related to the changes in t
he dipole moment of the complex systems to those of isolated molecules. The
dipole moments of 1:1 complexes of acetonitrile and acrylonitrile with o-c
resol in benzene and ethylene glycol and diethylene glycol in 1,4 dioxan we
re determined at 308 K using Huyskens method based on Onsager's theory. The
dipolar increments for these systems were computed from the bond angle dat
a available from molecular orbital studies. Our results show that the polar
ization interaction dominates in all the complexes studied and no higher or
der complexation is indicated. (C) 2001 Elsevier Science B.V. All rights re
served.