Abstract
The state of new polymethine (styryl and carbocyanine) 1,3,3-trimethyl-3H-indolium derivatives in aqueous solutions have been studied by spectrophotometry. Depending on the acidity, the reagents can occur in the ionic (singly (R+) or doubly (HR2+) charged) or the hydrolyzed (ROH) state. The main spectrophotometric characteristics and protolysis constants of the reagents have been calculated. A possible mechanism of protolytic transformations in solutions of polymethine reagents is proposed based on quantum-chemical calculations of charge distributions in their molecules and on electron and 1H NMR spectroscopy data. The results demonstrate the advisability of using polymethine compounds as efficient analytical reagents.
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