Use of Indicator Dyes for Studying Aggregation and Solvation Properties of Organised Assembles

Kedia, Niraja (2014) Use of Indicator Dyes for Studying Aggregation and Solvation Properties of Organised Assembles. PhD thesis, Indian Institute of Science Education and Research Kolkata.

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Abstract

The thesis deals with studies on environmental properties of the following systems. i) Homogeneous media (pure and mixed binary solvents), ii) micro-heterogeneous systems including homomicelles, cyclodextrin in aqueous media, iii) aqueous solutions of a water soluble neutral polymer containing fluorescent probes. It is instructive to study the spectral properties of a structurally similar molecule having only one D and one A centre. One of the objectives of this thesis is to study the photophysical properties of a structurally similar dye having D-A configuration. To investigate the nature of the emitting states for the two dyes, we have studied the spectral and photophysical properties of these dyes in binary mixture of aprotic and protic solvents and the results have been compared with those obtained in a binary mixture of protic solvents. Thus, spectral studies have been made in mixed binary solvents containing water. Different media used in the study include ten pure solvent, three mixed binary solvents, namely, dioxane + water, dimethylformamide + water and benzene + methanol mixture. The study has also been extended to the aqueous polymer-SDS system to reveal the polymer-surfactant interactions.

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