The photophysical properties of a new series of tripyrroledimethine-derived ‘expanded porphyrins’(‘texaphyrins’) are reported; these compounds show strong low energy optical absorptions in the 730–770 nm spectral range as well as a high triplet quantum yield, and act as efficient photosensitizers for the production of singlet oxygen in methanol solution.
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Harriman et al. (1989) studied this question.
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