Abstract
The effect of polymer microencagement on the lowest triplet excited state of croconate violet and croconate blue, members of a family of oxocarbon condensation derivatives which possess excellent electrocatalytic and photoelectrochemical dye sensitizing properties, has been investigated. These dyes, when surrounded by a poly(4-vinylpyridine) (PVP) matrix, displayed red-shifted S 0 → S 1 and T 1 → T n absorption maxima. The triplet lifetimes for these dyes were 69 μs and 24 μs respectively in neat ethanol, and 134 μs and 36 μs respectively in ethanol containing 0.01 M PVP. The specific rates of triplet energy transfer from a triplet sensitizer to the dyes were lower in the polymer-containing solutions.
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