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<p>The nature of the interaction of the dye Sbo {(E)-2-[4-(dimethylamino)styryl]-3-methylbenzo[d]oxazol-3-ium iodide} and its homodimer Dbo-10 with micelles of sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and Triton X-100 (TX-100) was studied using absorption and fluorescence spectroscopy. The fluorescence quenching mechanism of Sbo dye during the formation of complexes with SDS monomers was analyzed. Binding constants (K<sub>S</sub>) of dye molecules with surfactants and free energy changes (ΔG<sup>0</sup>) for the probe−micelle binding process were determined. Quantum-chemical calculations of the charge distribution and potential energy of the ground and excited states of the dye molecules were carried out and explained the increase in the values of the quantum yield and the fluorescence lifetime in micelles. Based on the results, it was revealed that dye molecules were localized in the low-polar environment of micelles, where they were isolated from water molecules.</p>

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Photophysics of Styrylcyanine Molecular Probes in Surfactant Solutions

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • A. Sh. Yarmukhamedov,
  • E. N. Kurtaliev,
  • I. D. Khairov,
  • N. Nizomov

摘要

The nature of the interaction of the dye Sbo {(E)-2-[4-(dimethylamino)styryl]-3-methylbenzo[d]oxazol-3-ium iodide} and its homodimer Dbo-10 with micelles of sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and Triton X-100 (TX-100) was studied using absorption and fluorescence spectroscopy. The fluorescence quenching mechanism of Sbo dye during the formation of complexes with SDS monomers was analyzed. Binding constants (KS) of dye molecules with surfactants and free energy changes (ΔG0) for the probe−micelle binding process were determined. Quantum-chemical calculations of the charge distribution and potential energy of the ground and excited states of the dye molecules were carried out and explained the increase in the values of the quantum yield and the fluorescence lifetime in micelles. Based on the results, it was revealed that dye molecules were localized in the low-polar environment of micelles, where they were isolated from water molecules.