π-Electronic conjugation is not necessary to facilitate long-range energy migration and transfer: A rapid (kENT=1.04×109 s−1) and efficient (ΦEXT=71 %) energy transfer from the 28 photoexcited zinc porphyrin units to the focal free-base porphyrin unit occurs in a large, star-shaped dendritic multiporphyrin array in which the chromophore units are linked through flexible ether groups (see picture).
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Choi et al. (2001) studied this question.
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