Steric and Electronic Effects in Basic Dyes VI — Electronic Absorption Spectra of Derivatives of Brilliant Green Containing Substituents in the Phenyl Ring

Abstract

A comprehensive series of mono‐ and di‐substituted derivatives of Brilliant Green has been prepared and the various electronic absorption spectra have been determined. Substituents in the 3‐ or 4‐position have little effect on the intensity of the first band, but the wavelength of maximum absorption is shifted to an extent which is linearly related to the appropriate Hammett substituent constant. Substitution in the 2‐position leads to a pronounced increase in the intensity of the long‐wavelength band.