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Two C60 units were covalently linked to 5,10-(cis-) or 5,15-(trans-) positions at a meso-tetraphenylporphyrin via pyrolidine spacers. 1H NMR, UV-visible absorption, and fluorescence spectroscopy showed that there is a considerable interaction among the chromophores in cis-isomers due to the close proximity of the two C60 moieties.
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Higashida et al. (1998) studied this question.
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