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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Molecular exciton theory calculations based on experimental results for Solophenyl red 3BL azo dye-surfactants interactions
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Molecular exciton theory calculations based on experimental results for Solophenyl red 3BL azo dye-surfactants interactions

机译：基于实验结果的Solophenyl red 3BL偶氮染料-表面活性剂相互作用的分子激子理论计算

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The influence of anionic surfactant: sodium dodecyl sulfate (SDS) and cationic surfactants:cetyltrimethylammonium bormides (C(16)TAB) and cetylpyridinium chloride (CPC) on the electronic spectrum of Solophenyl red 3BL azo dye (C.I. Direct 80) in aqueous solution was studied by means of UV-vis spectroscopy. Since, Solophenyl red 3BL azo dye was an anionic soluble dye, therefore, did not observed any interaction between SDS and 3BL dye. On the other hand, in the case of C(16)TAB, aggregation was reflected by a hyosochromic shift of the main absorption band and dye H-aggregation was responsible for the short wavelength absorption band. Also, UV-vis spectra showed that micelle formation occurs for C(16)TAB surfactant in 3BL dye aqueous solution in lower concentration in comparison with C(16)TAB in aqueous solution lonely. Micelle formation was indicated by a red shift of the whole spectra with respect to monomer location. The importance of hydrophobic interactions was revealed by the dependence of aggregation on the cationic surfactant structure. Further results showed that dye H-aggregation was occurred under the cationic surfactant CPC as well, but in this case micelle formation could not occur. Addition of CPC surfactant into the J-aggregate dye solution in highly acidic aqueous solution was also caused completely disaggregating of dimer molecules, which may be related to occuring an acid-base reaction between them. Applicability of the molecular exciton (Kasha) theory in order to interpret of aggregation results and to estimate dimer structure of 3BL dye under C(16)TAB and CPC surfactants addition was very poor and the calculated data based on this model showed that this simple point-dipole model could not describe our experimental results. (c) 2005 Elsevier B.V. All rights reserved.
机译：阴离子表面活性剂：十二烷基硫酸钠（SDS）和阳离子表面活性剂：十六烷基三甲基溴化铵（C（16）TAB）和十六烷基氯化吡啶鎓（CPC）对Solophenyl Red 3BL偶氮染料（CI Direct 80）在水溶液中的电子光谱的影响是通过紫外可见光谱研究。由于Solophenyl red 3BL偶氮染料是阴离子可溶性染料，因此，未观察到SDS和3BL染料之间的任何相互作用。另一方面，在C（16）TAB的情况下，聚集是通过主吸收带的色变而反映出来的，染料H聚集是短波长吸收带的原因。此外，紫外-可见光谱表明，与单独的水溶液中的C（16）TAB相比，在3BL染料水溶液中C（16）TAB表面活性剂的胶束形成浓度更低。胶束的形成通过整个光谱相对于单体位置的红移表示。通过聚集对阳离子表面活性剂结构的依赖性揭示了疏水相互作用的重要性。进一步的结果表明，在阳离子表面活性剂CPC下也发生了染料H的聚集，但在这种情况下不会发生胶束形成。在高酸性水溶液中，将CPC表面活性剂添加到J聚集染料溶液中也导致二聚体分子完全分解，这可能与它们之间发生酸碱反应有关。分子激子（Kasha）理论在解释聚集结果和估计3BL染料在C（16）TAB和CPC表面活性剂添加下的二聚体结构的适用性非常差，并且基于该模型的计算数据表明这一简单点-偶极子模型无法描述我们的实验结果。 （c）2005 Elsevier B.V.保留所有权利。

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