The aggregation of rhodamine 6G tetrafluoroborate and rhodamine 6G chloride in liquid crystalline solution (anisotropic host) was studied using polarized spectroscopy (the electronic absorption spectroscopy with polarized light). The self-association of these two ionic dyes in the normal solvents (isotropic hosts) was studied using absorption spectroscopy in the visible region for comparison. Therefore, the influence of the wBF xy1 anion on the molecular interaction of the guest molecules was investigated. The dimerization constants, Kdscdycm, of solutions containing rhodamine 6G tetrafluoroborate and rhodamine 6G chloride in dioxane were calculated to be 183 l moly1 and 2363 l moly1, respectively, indicating the important role of anion–cation interaction in their solvation. In contrast, the similarities of absorption spectra of these two dyes in aqueous solutions suggest that the type of anion has a minor effect on their absorption spectra. The nature of the interacting pairs in these dyes was discussed using the exciton theory.
کلید واژگان :Rhodamine dyes; Aggregation; Guest–host interactions; Anisotropic solvent; Nematic host
ارزش ریالی : 600000 ریال
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