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C. S. Sharov, V. M. Ivanov
3-(2-thiazolylazo)-2,6-diaminopyridine
states in solvents with non-associated structure. Solvating effect
Abstract
Aminoazoidic
/ iminohydrazonic forms of 3-(2-thiazolylazo)-2,6-diaminopyridine (TADAP)
equilibrium is investigated in 26 aprotonic solvents with the structure ordered
neither by hydrogen bond association nor by free electron pairs interaction
effects assuming TADAP molecules to be solvated by solvent molecules and to
possess spheric or elliptic form. TADAP tautomeric forms equilibrium constants
are calculated in different solvents. They are indicated to be dependent on the
mean molecular refraction of the solutions according to hyperbolic law. Solvate
spheres radii and solvate ellipsoids hemiaxes are determined. The dependence of
geometric parameters of solvate clouds on molecular refraction of solvents described
by a hyperbolic tangents function is stated. The fact affirms the confined
character of solvate clouds measures increase and allows to evaluate maximally
probable ones for TADAP molecules.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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