Photoelectrochemical investigations of phenosafranine dye bound to some macromolecules

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Abstract
Macromolecular-bound phenosafranine dyes have been synthesized and characterized. The absorption spectra of the polymer-bound dyes show a bathochromic shift while the emission spectra shift slightly to higher frequency. Cyclic voltammetry of polymeric phenosafranines adsorbed at the carbon electrode show the subsequent two-electron redox reaction of the dye. Flash photolysis of the monomeric and polymeric dyes in the presence of EDTA produce the one-electron reduced dye which disproportionates; the disproportionation rate constant was measured to be 109 and 108 dm3 mol–1 s–1, respectively. Photoelectrochemical studies of the macromolecular phenosafranine indicate different behaviour depending upon the macromolecule. In the case of an electrode coated with a film of poly(acrylamidomethylphenosafranine-co-methylolacrylamide) cathodic behaviour was observed with reference to an inert electrode, while and electrode, coated with a film of poly(acrylamidomethylphenosafranine-co-methylolacrylamide-co-vinylpyridine) exhibited enodic polarity. A water-splitting regenerative cell was shown to operate using the polymeric phenosafranine-coated electrodes.

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