Abstract
The effect of ethanol addition to pure gasoline on the solvatochromic band of dyes 2,6-diphenyl-4-(2,4,6-triphenylpyridinium-1-yl)phenolate ( 1), 2,6-di(4- tert-butylphenyl)-4-[2,4,6-tri(4- tert-butylphenyl)pyridinium-1-yl]phenolate ( 2), 1-(4-dimethylaminophenyl)-2-nitroethylene ( 3), and 1-(4-dimethylaminophenyl)-2-nitropropene ( 4) was investigated. The dyes are very soluble in gasoline–ethanol mixtures. The data show the occurrence of strong preferential solvation of the dyes by ethanol in all mixtures. Solutions of dye 2 are blue–green in gasoline, violet in ethanol, and green–blue in gasoline with 25% of ethanol, which allows a naked-eye detection of the presence of ethanol in gasoline. Also, the use of solvatochromic dyes to develop an analytical method for the determination of the quality of fuels is discussed.
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