Grafting an ethynylated-pyrene moiety to a Ru(II) or Os(II) polypyridine complex perturbs the photophysical properties of the metal fragment and, when the relevant energy levels are properly balanced, provides a 115-fold prolongation of the triplet lifetime.
A. Harriman, M. Hissler, A. Khatyr and R. Ziessel, Chem. Commun., 1999, 735 DOI: 10.1039/A900962K
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