Journal
DYES AND PIGMENTS
Volume 79, Issue 2, Pages 205-209Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2008.02.010
Keywords
dimethine cyanine dye; microwave irradiation; DNA; BSA; fluorescent quantum yield
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A series of dimethine cyanine dyes were synthesized in a fast, efficient and high yield by the condensation of quaternary salts with 1H-indole-3-carbaldehyde in the presence of piperidine under solvent-free microwave irradiation. The products were identified by H-1 NMR, IR, UV-vis spectroscopy and elemental analysis. The absorption and fluorescence properties of the dyes in both the free state and DNA or BSA were investigated. Significant enhancement of the fluorescent quantum yield was observed for all the dyes in the presence of DNA, with one compound demonstrating excellent sensitivity as a fluorescent probe. (C) 2008 Elsevier Ltd. All rights reserved.
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