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Intramolecular Triplet Energy Transfer in Pyrene-Metal Polypyridine Dyads: A Strategy for Extending the Triplet Lifetime of the Metal Complex
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1999
Year
EngineeringPyrene-based DyadsSynthetic PhotochemistryMetal ComplexChemistryPolymersPyrene-metal Polypyridine DyadsMacromolecular EngineeringPolymer ChemistryMaterials ScienceInorganic ChemistryPhotochemistryTriplet LifetimeRuthenium TripletPhysical ChemistrySupramolecular PhotochemistryFlexible SynthesisBiomolecular EngineeringOrganic Charge-transfer CompoundDepolymerizationPolymer Science
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).