An elegant and flexible synthesis of pyrene-based dyads bearing ruthenium or osmium chromophoric moieties connected through a single C≡C bond or a Pt(C≡C)2 spacer is described (see picture). Photophysical properties reveal that the two Ru-based units enter into reversible triplet energy transfer with the appended pyrene. This effect is responsible for the unusual prolongation of the ruthenium triplet excited (40 and 17 μs, for pyr–Ru and pyr–Pt–Ru, respectively).
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Hissler et al. (1999) studied this question.
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