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Synthesis & Structural Correlation with UV Absorption Maxima of
Some Novel Hexamethine Quinaldine Asycyanine Colorants
Ansari A.S. [1a], Ali, I[2], Haque, M.W[1b] , Khan , M.H [1c] ,Narayan, B[3]
Page No. 63-70
Abstract
In this study new hexamethine asy-cyanine colorants were synthesized by the reaction of
N,N-dimethylaminophenylbutadienylphenyl ketone, N,N-dimethyl-aminophenylbutadienyl-4’-
bromophenyl ketone and N,N-dimethylamino-phenylbutadienyl-4’-methylphenyl ketone with
2-methyl-N-propyl quinolinium iodide and 6-substituted-2-methyl-N-propyl quinolinium
iodides in ethanolic DMF with piperidine catalyst. These colorants were shown to have
uniform bathochromic shifts (BS) when compared to analogues with no substituent at β-
phenyl nucleus or analogues having dimethine or tetramethine asy-cyanine colorants. They
further showed bathochromic shifts with electron withdrawing group (NO2 group) electron
donating (CH3 group) at 4’-position at β-phenyl nucleus.
Keywords: Asy-cyanine colorants, Hexamethine, N,N-dimethylaminophenylbuta-dienyl phenyl
ketone, 2-methyl-N-propylquinolinium iodide
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