THE EFFECTS OF CYCLIC TERMINAL GROUPS IN DI-ARYLMETHANE AND TRI-ARYLMETHANE DYES - PART 2 - STERIC AND ELECTRONIC EFFECTS IN DERIVATIVES OFVICTORIA-BLUE

The effects of N-alkyl and heterocycloalkyl substituents on the light absorption properties of a range of novel dyes based on the 1-naphthyl analogue of Crystal Violet, Victoria Blue, have been investigated. In teraction between the N-terminal group and the peri-hydrogen atom on t he naphthyl residue can result In deconjugation of the former, whereup on the dyes exhibit Malachite Green character. Such steric influences are correlated with H-1 NMR data.