Photosensitization of oxygen-bridged dicobalt(III) cations by the Tris(2,2'-bipyridine)ruthenium(II) excited state. Luminescence quenching and product quantum yields

Journal Article · Sun Jun 01 00:00:00 EDT 1980 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50208a057· OSTI ID:5052498

Chandrasekaran, K; Natarajan, P

Mechanisms of quenching of the excited state of Ru(bpy)/sub 3//sup 2 +/ by superoxo-bridged dinuclear cobalt(III) complexes are investigated by using luminescence quenching studies and by product quantum yield analysis. Bimolecular quenching constants are of the order of 10/sup 9/ M/sup -1/ s/sup -1/, which is somewhat higher than the value expected on formal charge basis. Formation of Ru(bpy)/sub 3//sup 3 +/ and the cobaltous ion as products of photosensitization although in low yields is explained to occur in an energy-transfer pathway. The energy-transfer pathway accounts for about 10% of the quenching events whereas the excited-state electron-transfer process accounts for 90% of the quenching. The dark redox reaction which follows the energy-transfer pathway leads to the products formed in steady photolysis studies.

• Research Organization: Univ. of Madras, Tiruchirapalli, India
• OSTI ID: 5052498
• Journal Information: Inorg. Chem.; (United States), Vol. 19:6
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BIPYRIDINES
EXCITED STATES
PHOTOCHEMISTRY
COBALT COMPLEXES
PHOTOLUMINESCENCE
RUBIDIUM COMPLEXES
SOLAR ENERGY CONVERSION
EXPERIMENTAL DATA
ALKALI METAL COMPLEXES
AZINES
CHEMISTRY
COMPLEXES
CONVERSION
DATA
ENERGY CONVERSION
ENERGY LEVELS
HETEROCYCLIC COMPOUNDS
INFORMATION
LUMINESCENCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
TRANSITION ELEMENT COMPLEXES
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400500 - Photochemistry