Abstract
Electronic absorption and steady state emission properties of a hemicyanine dye [4-[4-(dimethylamino)styryl]-1-docosylpyridinium bromide], have been studied in several pure solvents and two mixed binary solvents (water + ethanol and water + acetonitrile). In pure solvents the band-width of the absorption spectrum correlates well with the Stoke's shift. In mixed aqueous solvents two different molecular forms of the solute, viz. the monomer and the dimer of the solute exists in equilibrium. Thermodynamic parameters (e.g. the Δ G° and Δ H°) characterizing the equilibrium have been determined. While the value of Δ G° changes very slightly with the composition of the binary mixture, the value of Δ H° has been observed to depend significantly with solvent composition.
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