Excited-state redox properties of ruthenium(II) phthalocyanine from electron-transfer quenching
Electron-transfer reactions between the lowest-lying triplet state, /sup 3/..pi pi../sup */, of ruthenium (phthalocyanine)(pyridine)/sub 2/ and various nitroaromatic compounds have been studied by laser and conventional flash photolysis. Quenching rate constants determined for the oxidation of the excited state have been treated according to the Marcus-Hush theory. A self-exchange rate constant K approx. 10/sup 7/ M/sup -1/ x/sup -1/ was determined for the self-exchange reaction between the /sup 3/..pi pi../sup */ and radical cation, Ru(ph)(py)/sub 2//sup +/. Such a value indicates that the major component to the Franck-Condon reorganizational energy is the outer-sphere contribution. The photochemical properties of the phthalocyanines are discussed in terms of the redox potentials estimate for various excited states.
- Research Organization:
- Univ. of Notre Dame, IN
- OSTI ID:
- 6179795
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 86:20
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANIC NITROGEN COMPOUNDS
ELECTRON TRANSFER
RUTHENIUM COMPLEXES
AROMATICS
CHEMICAL REACTION KINETICS
EXCITED STATES
PHTHALOCYANINES
PYRIDINES
QUENCHING
REDOX POTENTIAL
AZINES
COMPLEXES
DYES
ENERGY LEVELS
HETEROCYCLIC COMPOUNDS
KINETICS
ORGANIC COMPOUNDS
REACTION KINETICS
TRANSITION ELEMENT COMPLEXES
400500* - Photochemistry
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)