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Association of 5,5′-Dibromo-o-Cresolsulfonphthalein Anions with Dye Cations in Aqueous Solution

Serghiy Shapovalov
Affiliation: 
V. N. Karazin Kharkiv National University, 4 Svobody sq., 61022 Kharkiv, Ukraine serghey.a.shapovalov@karazin.ua
DOI: 
https://doi.org/10.23939/chcht16.03.387
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PDF icon full_text.pdf694.61 KB
Abstract: 
The formation of associates in aqueous solutions between single- or double-charged anions of 5,5′-dibromo-o-cresolsulfonphthaleine and single-charged cations of cyanine dyes (quinaldine blue, quinaldine red) has been considered. Based on the spectrophotometric data, the equilibrium constants of the association were analyzed. The energy of cation-anion interactions (standard enthalpy of formation of ions and associates) was determined by the semi-empirical AM1 method and probable structures of associates were set. The consistency between experimental spectrophotometric and calculated quantum chemical data is discussed.
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