Solvato- and halo-chromic behaviour of some 4-[(N-methylpyridiniumyl)methylidineamino]phenolate dyes
Abstract
The solvato- and halo-chromic behaviour of the phenolate dyes 4–6 is described and compared with their analogues 1 and 3. The observed trends are discussed and rationalized in terms of semiempirical molecular orbital calculations.