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The dimerization study of some cationic monomethine cyanine dyes by chemometrics method

Abstract

The thermodynamics of the monomer-dimer equilibrium of five cationic monomethine cyanine dyes has been studied by means of UV-vis spectroscopy and advanced chemometrics methods. The dimerization constants were determined by studying the dependence of their absorption spectra on temperature in the range 20–75°C and were found to be: 1.91 × 103, 1.53 × 103, 6.81 × 103, 5.18 × 103, and 8.28 × 103 dm3 mol−1 for 1, 2, 3, 4, and 5 respectively. The absorption spectra of the monomer and dimer forms of the dyes were also determined, as well as the enthalpy and entropy of the dimerization.

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Correspondence to Shahin Ahmadi.

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Ahmadi, S., Deligeorgiev, T.G., Vasilev, A. et al. The dimerization study of some cationic monomethine cyanine dyes by chemometrics method. Russ. J. Phys. Chem. 86, 1974–1981 (2012). https://doi.org/10.1134/S0036024412130201

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  • DOI: https://doi.org/10.1134/S0036024412130201

Keywords

  • dimerization
  • chemometrics
  • UV-vis spectroscopy
  • monomethine cyanine dyes