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Photophysics of Styrylcyanine Molecular Probes in Solutions of Surfactants
Abstract
The nature of the interaction of the dye Sbо ((E)-2-(4-(dimethylamino)styryl)-3-methylbenzo[d]oxazol-3ium iodide) and its homodimer Dbо-10 with micelles of sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB) and Triton X-100 (TX-100) has been studied using absorption and fluorescence spectroscopy. The mechanism of fluorescence quenching 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 (∆G0) 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, on the basis of which the increase in the values of the quantum yield and the fluorescence lifetime in micelles is explained. Based on the results obtained, it was revealed that dye molecules are localized in the low-polar environment of micelles, where they are isolated from water molecules.
About the Authors
A. Sh. Yarmukhamedov
Sh. Rashidov Samarkand State University
Uzbekistan
Uzbekistan
Samarkand
E. N. Kurtaliev
Sh. Rashidov Samarkand State University
Uzbekistan
Uzbekistan
Samarkand
I. D. Khairov
Sh. Rashidov Samarkand State University
Uzbekistan
Uzbekistan
Samarkand
N. Nizomov
Sh. Rashidov Samarkand State University
Uzbekistan
Uzbekistan
Samarkand
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Review
For citations:
Yarmukhamedov A.Sh., Kurtaliev E.N., Khairov I.D., Nizomov N. Photophysics of Styrylcyanine Molecular Probes in Solutions of Surfactants. Zhurnal Prikladnoii Spektroskopii. 2025;92(6):793-801. (In Russ.)
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