Abstract
Interaction of a series of N-alkyl styryl pyridinium dyes having varied alkyl chain (Cn) with nonionic surfactant (Triton X-100) solution has been studied by using absorption and emission techniques. The binding constants of the dyes (C1–C18) with the surfactant aggregates have been calculated and found to increase with increasing alkyl chain length of the dyes. A decrease in the CMC value of TX-100 in presence of the dyes with increasing chain length has been observed and the phenomenon is attributed to the increasing hydrophobicity of the additive. The relative ET(30) values of the local environment of the dyes in TX-100 micelles with respect to standard solvents have been determined. A solubilisation strategy of the micelle for the dyes has been reported where the cationic head group remains in the oxyethylene cage of the micelle and the hydrophobic tail remains buried in the micellar core due to pulling effect.
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