Rezaei Behbehani
Department of Chemistry, Imam Khomeini International University Qazvin Iran, E-mail:
rezaeib@ikiu.ac.ir
Abstract
The enthalpies of transfer, DHqt,
of LiBr, tetrabutylammonium bromide, n-Bu4NBr, and
tetrapentylamonium bromide, n-Pen4NBr, from water to aqueous
acetonitrile solvent system are reported and analyzed in terms of the new
developed solvation theory. The solvation parameters obtained from the analyses
indicate that the net effect of tetraalkylammonium bromides on solvent structure
is a breaking of solvent-solvent bonds and thus tetraalkylammonium bromides is
preferentially solvated by acetonitrile. Preferential solvation of
tetraalkylammonium bromides by acetonitrile is consistent with hydrophobisity of
these compounds. LiBr is preferentially solvated by water.
Key words: preferential solvation, variable (an + bN), solvent-solvent bonds