Abstract
New asymmetric trimethine cyanine dyes were prepared by condensation of3-β-acetanilidovinyl derivatives, with 2-methylpyridinium(quinolinium)-2-yl salts. Cyclo-condensation reaction of the dyes with urea gave new asymmetric biheterocyclic trimethine cyanines. The electronic absorption spectra of the dyes in the visible region is reported.
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