The Bombay Technologist

Relation between λ_max and P-Substituents in some Mono-Azo Dyes

Rohit Bhide

Department of Intermediates & Dyestuff Technology

Amruta Joglekar

Department of Intermediates & Dyestuff Technology

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Abstract

In this project, two series of azo dyes were synthesized by diazotization of para substituted anilines and coupling with 2-naphthol (series 1) and N,N-dimethylaniline (series 2). The wavelength of maximum absorption for the azo dyes of both the series was found with a UVVIS spectrophotometer. For a particular series, the variation between the inverse of wavelength of maximum absorption with the Hammett coefficient of the para substituent of that particular azo dye was studied.