Association constants and heats of formation of heteroassociates of anions of sulphophthaleine dyes |
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Authors: | S A Shapovalov |
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Institution: | 1.Karazin Kharkov National University,Kharkov,Ukraine |
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Abstract: | The tendency of anions of sulphophthaleine dyes to heteroassociation was studied in aqueous solutions of phenol red, bromophenol
blue, bromocresol green, bromocresol purple, and bromothymol blue. It was spectrophotometrically determined that single-(Han−) and double-charged anions (An2−) of sul-phophthaleines can form stable heteroassociates of composition Ct+ · HAn− and (Ct+)2 · An2− with cations (Ct+) of polymethine dyes, pinacyanol, and quinaldine red. The values of enthalpy formation of ions of dyes and heteroassociates
were calculated using semi-empirical methods, then correlated with experimentally determined values of equilibrium association
constants. |
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Keywords: | |
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