|
C. S. Sharov, V. M. Ivanov
Protolytic
equilibria of 3-(2-thiazolylazo)-2,6-diaminopyridine in aqueous solutions and
organic solvents
Abstract
Protolytic equilibria of
3-(2-thiazolylazo)-2,6-diaminopyridine (TADAP) are studied in aqueous solutions
and 14 organic solvents, isobestic points and absorbance maxima wavelengths
being determined, molar absorbance coefficients being calculated and the
correlation between isobestic points and protonizing / deprotonizing definite
acidic forms being performed. Acidic constants of all protolytic TADAP forms
are calculated. Protolytic equilibria are revealed to be heavily influenced by
TADAP molecules dimerization in low dielectric permeability (e)
environments. The dependence of acidic constants upon e of a
solvent is found to be in the solvents under investigation and is explained.
Copyright (C) Chemistry Dept., Moscow State University, 2002
|
|
