Complexation and Solvation on Extraction of Phenol
by Trioctylphosphine and Trioctylamine Oxides

M. K. Drozdova, I. V. Nikolaeva, and V. G. Torgov

Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences,
pr. akademika Lavrent’eva, Novosibirsk, 630090 Russia

Received December 13, 1995

Abstract—The formation of H-bonded molecular complexes of 1 : 1 composition was established through
study of the complexation of phenol with trioctylphosphine (I) and trioctylamine (II) oxides in extraction sys-
tems. The apparent extraction () and stability () constants for phenol complexes with II in hexane,
CCl₄, toluene, CHCl₃, and 1,2-dichloroethane exceed those for phenol complexes with I almost by an order of
magnitude. It was revealed that in a series of organic S-, P-, and N-oxides, the values of in CCl₄ grow
linearly with increasing donor capacity of bases in the hydrogen bonding. The stability of complexes declines
with increasing solvation ability of solvents at the expense of the predominant solvation of oxides.

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