Abstract

Bhupendra Narayan¹ and Samad Ansari²*

Fifteen new Butadienyl chain substituted benzothiazole asycyanine colorants have been synthesized by catalytic condensation of 4-dimethyl aminostyrylphenyl ketone ,4- dimethyl aminostyryl -3’-bromophyenyl ketone 4- dimethyl aminostyryl-3’-methoxyphyenyl ketone with with 2-methyl -3-(1-methylethyl) Benzothizolium iodied and 2-methyl -6-substituted -3-(1-methyl ethyl)benzothizolium iodied using piperidine as catalyst and ethanolic D.M.F.as solvent . The butadienyl chain substituted benzothia acysyanine were found to exhibit uniform increase of absorption maxima when collated with analogues having no substitution in the b-phenyl nucleus and the analogues aving vinylene chain but exhibit uniform decease of absorption maxima when collated with analogues having longer chain such as hexatriene chain.

Benzothiazole asycyanine colorants; dimethylaminostyrylphenyl ketone; benzothiazolium iodide; absorption maxima

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