Kurtaliev Eldar N, Yarmukhamedov Akmal Sh, Djamalova Asalya A, Nizomov Negmat, Terekhov Sergei N
Samarkand State University, 15 University Boulevard, Samarkand, 140104, Uzbekistan.
B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, Nezavisimosti ave. 68-2, Minsk, 220072, Belarus.
J Fluoresc. 2024 Sep 28. doi: 10.1007/s10895-024-03921-4.
Solubilization of the styrylcyanine dye Sbt ((E)-2-(4-(dimethylamino)styryl)-3-methylbenzo[d]thiazol-3-ium iodide) and its homodimers Dbt-5 and Dbt-10 in aqueous solution of sodium dodecyl sulfate and Triton X-100 has been studied by steady state and picosecond time-resolved fluorescence spectroscopy. At low concentration of sodium dodecyl sulfate in solution, between Sbt, Dbt-5 dyes molecules and surfactant ion pairs are formed followed by the formation non-luminescent H-aggregates. The nature of the interaction between molecules of dyes and surfactants has been revealed. The binding constants K of the dyes to the surfactants, free energy changes (ΔG), the number of dye molecules (n) included in a single micelle and photophysical parameters have been determined. The degree of solubilization of dyes in micellar solution of Triton X-100 is higher as compared to sodium dodecyl sulfate and depends on the molecular weight and size of both dye molecules and micelles.
通过稳态和皮秒时间分辨荧光光谱研究了苯乙烯基花菁染料Sbt（（E）-2-（4-（二甲基氨基）苯乙烯基）-3-甲基苯并[d]噻唑-3-碘鎓）及其同二聚体Dbt-5和Dbt-10在十二烷基硫酸钠和Triton X-100水溶液中的增溶作用。在溶液中十二烷基硫酸钠浓度较低时，Sbt、Dbt-5染料分子与表面活性剂离子对形成，随后形成非发光的H-聚集体。揭示了染料分子与表面活性剂之间相互作用的本质。测定了染料与表面活性剂的结合常数K、自由能变化（ΔG）、单个胶束中包含的染料分子数（n）和光物理参数。与十二烷基硫酸钠相比，染料在Triton X-100胶束溶液中的增溶程度更高，并且取决于染料分子和胶束的分子量和大小。
