V. A. Durov and I. Yu. Shilov
Faculty of Chemistry, Moscow State University, Moscow, 119992 Russia
e-mail: durov@phys.chem.msu.ru
Received June 15, 2007
Abstract—Supramolecular structure models were suggested to describe the permittivity of methanol over a
wide range of state parameters from the melting point to the supercritical region. The models were based on the
quasi-chemical model of a nonideal associated solution. The permittivity and dipole correlation factor of meth-
anol were calculated over the temperature range 177–593 K at pressures from 0.1 to 20 MPa for two supramo-
lecular structure models. Methanol molecules formed chain associates according to the first model and chain
and cyclic aggregates according to the second one. Both models successfully described the experimental data
on pure methanol, but the inclusion of cyclic aggregates was necessary for consistency with models of methanol
solutions in various solvents over the entire composition range. The thermodynamic and structural parameters
of supramolecular aggregates were calculated. The particle-size distributions of aggregates and other integral
and differential characteristics of association over the whole range of fluid methanol state parameters were
determined for the first time.
DOI: 10.1134/S0036024408110095
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