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State of Polymethine (Styryl and Carbocyanine) Indolium Derivatives in Aqueous Solution and Their Analytical Properties

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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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Authors and Affiliations

  1. Chemistry Department, Uzhgorod State University, ul. Pidgirna 46, Uzhgorod, 88000, Ukraine

    Ya. R. Bazel' & Zh. A. Kormosh

  2. Institute of Organic Chemistry, National Academy of Sciences of Ukraine, ul. Murmanskaya 5, Kiev, 02600, Ukraine

    A. A. Tolmachev

Authors
  1. Ya. R. Bazel'
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  2. Zh. A. Kormosh
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  3. A. A. Tolmachev
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Bazel', Y.R., Kormosh, Z.A. & Tolmachev, A.A. State of Polymethine (Styryl and Carbocyanine) Indolium Derivatives in Aqueous Solution and Their Analytical Properties. Journal of Analytical Chemistry 57, 118–124 (2002). https://doi.org/10.1023/A:1014091218429

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