Abstract
The trons ⇌ cis photoisomerism of 1-phenylazo-4-methoxynaphthalene and the azo tautomer of 4-phenylazo-l-naphthol was studied in liquid solvents (ethanol and cyclohexane) and polymer films (cellulose acetate and triacetate, and poly(methyl methacrylate)). In the solvents, first-order kinetics for thermal cis → trans reversion of the former compound were observed after overlap of the absorbance bands of each isomer had been taken into account. However, in polymer substrates, the heterogeneous environment and restricted molecular motion gave rise to more complicated kinetics. The cis isomer of the azo tautomer of 1-phenylazo-4-naphthol had too short a lifetime to be observed in solution, but in dry polymer substrates its lifetime was sufficiently prolonged to allow spectroscopic observation. Wetting the dyed polymer films with water greatly accelerated the rate of cis → trans reversion of the azo tautomer of 1-phenylazo-4-naphthol.
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