Scientific Journal of Samarkand University


The effect of light irradiation on the spectral-luminescent characteristics of some rhodamine dyes with a carboxyl group in solvents of various natures was studied. It has been established that under the influence of light irradiation in aqueous solutions of selected dyes, a decrease in the intensity of absorption and fluorescence with a simultaneous hypsochromic shift of the electronic spectra is observed.Under the same conditions, discolored solutions of rhodamine dyes in a binary solvent mixture of 1% water + 99% DMSO are reduced in color and, accordingly, absorbing and fluorescent capacity. The observed phenomenon is explained by the transition of molecules of rhodamine dyes from a lactone form to cationic.

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