Exciplexes of ruthenium(II). cap alpha. -diimine complexes with silver(I)
Luminescence quenching of RuL/sub 3//sup 2 +/ (L = 2,2'-bipyridine and 4,7-dimethyl-1,10-phenanthroline) photosensitizers by Ag/sup +/ in aqueous solutions is shown to proceed, not by oxidative electron transfer quenching as previously believed, but predominantly by formation of luminescent exciplexes. Photochemical formation of Ag/sup 0/(aq) is < 0.02 in water and < 0.05 in acetonitrile. Both a normal bimolecular exciplex, *(RuL/sub 3//Ag)/sup 3 +/, and a rare termolecular *(RuL/sub 3//Ag/sub 2/)/sup 4 +/ exciplex are observed. This appears to be the first example of an exciplex formed by a Ru(II) ..cap alpha..-diimine sensitizer and of a termolecular metal complex exciplex. Spectral properties of the exciplexes, energetics, and dynamics for these systems are discussed.
- Research Organization:
- Univ. of Virginia, Charlottesville (USA)
- OSTI ID:
- 7148138
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:5; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AQUEOUS SOLUTIONS
AROMATICS
AZAARENES
AZINES
CATIONS
CHARGED PARTICLES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
DE-EXCITATION
DECOMPOSITION
DISPERSIONS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
IONS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENANTHROLINES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PYRIDINES
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
SILVER COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YIELDS