Intramolecular energy transfer in the covalently linked dimeric complex ((bpy)/sub 2/Ru(b-b)Ru(biq)/sub 2/)/sup 4 +/
The covalently linked dimer ((bpy)/sub 2/Ru(b-b)Ru(biq)/sub 2/)/sup 4 +/ (bpy = bipyridine, b-b = 1,4-bis(2-(4'methyl-2,2'-bipyridyl-4-yl)ethyl)benzene, and biq = 2,2'-biquinoline) was prepared, and its photophysical behavior in room-temperature solutions and low-temperature glasses was examined. Luminescence is observed from both Ru ..-->.. bpy metal-to-ligand charge-transfer (MLCT) and Ru ..-->.. biq MLCT states; however, the Ru ..-->.. bpy emission is nearly completely quenched in acetonitrile solutions. In low-temperature (13 K) ethanol/methanol glasses a rise and fall is observed in the Ru ..-->.. biq luminescence decay, clearly indicating sensitization by the Ru ..-->.. bpy MLCT emission. The temperature dependence of the Ru ..-->.. bpy MLCT emission of the dimer and the emission of ((bpy)/sub 2/Ru(b-b))/sup 2 +/ can be fit to a model in which emission occurs from each of two MLCT states separated by 65-80 cm/sup 1/. The decay of the ((bpy)/sub 2/Ru(b-b)) center of the dimer is dominated by energy transfer to the Ru ..-->.. biq MLCT manifold. The relative energy-transfer rates from each of two Ru ..-->.. bpy MLCT states of the ((bpy)/sub 2/Ru(b-b)) center of the dimer are discussed in terms of a dipolar coupling mechanism.
- Research Organization:
- Tulane Univ., New Orleans, LA (USA)
- OSTI ID:
- 6333673
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:22; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
ACETONITRILE
AROMATICS
AZAARENES
AZINES
BIPYRIDINES
CHEMICAL REACTIONS
COMPLEXES
DATA
DIMERS
EMISSION SPECTROSCOPY
ENERGY TRANSFER
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
LUMINESCENCE
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PYRIDINES
QUINOLINES
RUTHENIUM COMPLEXES
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPLEXES