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The lowest photoexcited metastable triplet state of a family of highly conjugated (porphinato)zinc(II) arrays in which ethyne, butadiyne, and octatetrayne units bridge the macrocycle carbon frameworks were studied by EPR spectroscopy at low temperature in solution. One series of meso-to-meso ethyne-bridged (porphinato)zinc(II) structures probes how the length of the conjugated bridge separating two...
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