Synthesis and Spectral Properties of Hetaryl  Monoazo dyes derived from 2-amino-5-nitrothiazole

J. O. Otutu³, E. Osabohien¹ and E. M. Efurhievwe²

¹Department of Chemistry, Faculty of Science, Delta State University, P.M.B. 1, Abraka (Nigeria).

²Nigerian National Petroleum Company, Warri Refinery and Petrochemical Company,

³Petroleum Product and Quality Control, Fuels Laboratory, Ekpan, Warri (Nigeria).

ABSTRACT:

Various hetarylazo dyes have been synthesized by coupling reactions between diazotised 2-amino-5-nitrothiazole and 2-chloroaniline, 1,3-dihydroxybenzene and N-phenyl naphthylamine.  Spectral measurements were carried out in different solvents.  The solvatochromic behaviour of the dyes in various solvents were evaluated.  The 2-amino-5-nitrothiazole dye derivatives absorb maximally at longer wavelengths and are tinctorially stronger than the 1-naphthylamine dyes, although the former dyes have higher extinction coefficients.  Also, the synthesized dyes exhibit positive solvatochromism so that the absorption bands of the dye, move towards longer wavelengths as the polarity of the solvent increases.

KEYWORDS:

Absorption maxima; Tautomerism; azo dyes; solvent effects

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Copy the following to cite this article: Otutu J. O, Osabohien E, Efurhievwe E. M. Synthesis and Spectral Properties of Hetaryl Monoazo dyes derived from 2-amino-5-nitrothiazole. Orient J Chem 2011;27(4).

Copy the following to cite this URL: Otutu J. O, Osabohien E, Efurhievwe E. M. Synthesis and Spectral Properties of Hetaryl Monoazo dyes derived from 2-amino-5-nitrothiazole. Orient J Chem 2011;27(4). Available from: http://www.orientjchem.org/?p=24140