Journal
COORDINATION CHEMISTRY REVIEWS
Volume 249, Issue 13-14, Pages 1336-1350Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2004.12.017
Keywords
metal polypyridine complexes; excited-state equilibration; energy transfer; luminescence lifetimes; supramolecular photochemistry/photophysics
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A recently developed strategy to prolong the luminescence lifetime of metal polypyridine complexes is discussed, and various resulting supramolecular systems are presented. The intervening mechanism demands that certain thermodynamic and kinetic parameters are satisfied, notably rapid and reversible electronic energy transfer between lowest-lying isoenergetic triplet excited states located on an inorganic moiety, e.g., a triplet metal-to-ligand charge transfer state ((MLCT)-M-3), and localised on a separate organic chromophore, such as a triplet (3)pi-pi* state, although the involvement of other states is also considered. Originally implemented with a pyrenyl-appended Ru(II) polypyridine complex, the generality of this approach has been demonstrated through the judicious combination of different metal complexes having (MLCT)-M-3 states in conjunction with various matched organic chromophores and thus presents a new tool to instil made-to-order properties in supramolecular systems. Multichromophoric species and systems invoking second-sphere interactions are also considered. (c) 2005 Elsevier B.V. All rights reserved.
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