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D. V. Snigur, A. N. Chebotarev, K. V. Bevziuk
The
investigation of acid-base properties of some 6,7-dihydroxybenzopyrylium chlorides in solutions by chemical
chromaticity method
Abstract
The acid-base equilibria of some 6,7-dihydroxybenzopyrylium
chlorides derivatives in solutions have been studied by the chemical
chromaticity method and the corresponding ionization constants of their
functional groups have been determined. The equilibria schemes and diagrams of
the distribution of ion-molecular forms of the reagent from the medium acidity
have been proposed. It is shown that the chemical chromaticity method gives the
possibility to determine the constants of protonation and hydroxylation of the
dyes, as well as their connection with the charges on the atoms of oxygen and
2-C atoms of benzopyrylium cycle.
Key words: chemical chromaticity method, spectrophotometry, acid-base
equilibrium, constants of ionization.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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