Abstract
Novel asymmetric trimethine benzothiazole cyanine dyes with different N-substituents were synthesized and char- acterized by MS and 1 H NMR techniques. The maximums of absorption and emission spectra of the dyes in ethanol were in the range of 628~631 and 662~666 nm, respectively. The dyes were almost non-fluorescent in solvents, which can reduce the background interference greatly. The photodegradation experiment showed that the octyl group on quinoline ring and ben- zyl group on benzothiazole ring improved the photostabilites of the dyes obviously. The rate constants of photoreaction of the dyes 8a~8d were 6.38×10 -4 , 12.5×10 -4
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