期刊
MOSCOW UNIVERSITY CHEMISTRY BULLETIN
卷 72, 期 4, 页码 187-191出版社
ALLERTON PRESS INC
DOI: 10.3103/S0027131417040095
关键词
tristimulus colorimetry; spectrophotometry; acid-base equilibrium; ionization constants
The acid-base equilibria of 6,7-dihydroxybenzopyrylium chloride derivatives in solutions are studied by tristimulus colorimetry. The ionization constants of their functional groups are determined. Possible schemes of the equilibria and the distribution diagrams of the ion-molecular forms of the reagents are proposed depending on the pH of the medium. It is shown that tristimulus colorimetry can be used to determine the protonation and hydroxylation constants of the dyes. The relation between these constants and the charges on the oxygen atoms and 2-C atoms of the benzopyrylium ring is established.
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