K. Mahadevan, J. N. Masagalli, H. N. Harishkumar
Aug 31, 2014
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Abstract
The synthesis and fluorescence efficiency of 3-(1, 3-benzothiazol/benzoxazol-2-yl)-2H-chromen2-one derivatives 4a-j have been described. To improve the fluorescence characteristics especially emission wavelength, the substitution like diethylamino, fluoro, bromo, chloro, trifluoromethyloxy, methyloxy and methyl groups on 7th position of salicyladehydes 1a-j and substitutions such as fluoro, methyl and nitro groups on 5th and 6th position of ethyl-1,3benzothiazol/benzoxazole-2yl-acetates were selected as donor and acceptor groups. The fluorescence property was investigated spectrophotometrically in chloroform at 1⇥10 6 M concentration with Rhodamine B as standard dye. All the compounds were found to emit blue light in the region between 450 to 495 nm. The quantum yield of all the compounds 4a-j were found to be moderate when compared to Rhodamine B as standard.