Luminescence of ruthenium(II) and osmium(II) polypyridyls in acetonitrile at high pressures
The spectra, quantum yield, and lifetime of excited Ru(II) and Os(II) tris(bipyridine) and tris(phenanthroline) complexes have been studied in acetonitrile as a function of pressure (0.1-300 MPa) and temperature (2-70/sup 0/C). The radiative and nonradiative transition rates between the luminescent CT level and the ground states are generally increased by 5-10% at pressures of 300 MPa. A pressure effect of greater magnitude and opposite direction is observed for the luminescence lifetime tau of Ru(II) complexes, because a third CT ..-->.. LF nonradiative decay channel is thermally accessible and made inaccessible by pressure. The measurement of activation volumes for tau at different temperatures gives ..delta..V = 11.5 mL/mol for the CT ..-->.. LF deactivation path of Ru(bpy)/sub 3/Cl/sub 2/ in CH/sub 3/CN. 34 references, 5 figures, 8 tables.
- Research Organization:
- Univ. of California, Santa Barbara
- OSTI ID:
- 6486640
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 89:15
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BIPYRIDINES
EMISSION SPECTRA
LIFETIME
QUANTUM EFFICIENCY
OSMIUM
PHENANTHROLINES
RUTHENIUM
ACETONITRILE
EXCITED STATES
EXPERIMENTAL DATA
LIGANDS
LUMINESCENCE
PRESSURE DEPENDENCE
RADIATIONLESS DECAY
TEMPERATURE DEPENDENCE
AROMATICS
AZAARENES
AZINES
DATA
DE-EXCITATION
EFFICIENCY
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
HETEROCYCLIC COMPOUNDS
INFORMATION
METALS
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLATINUM METALS
PYRIDINES
SPECTRA
TRANSITION ELEMENTS
400500* - Photochemistry