Laser studies of radiationless decay mechanisms in Os/sup 2+/3+/ polypyridine complexes
The results of picosecond absorption studies show a lack of significant change with decreasing temperature (295 K to 10 K) on the lifetimes of the ligand-to-metal charge transfer (LMCT) in the OsL/sub 3//sup 3 +/ complexes; L = 2,2' bipryridine (bpy) or 1,10 phenanthroline(phen). The LMCT lifetimes at low temperature are then contrasted with the low temperature lifetimes of the metal-to-ligand charge transfer (MLCT) states of the OsL/sub 3//sup 2 +/ complexes and both are examined from the perspective of a radiationless theory developed by Englman and Jortner. Mid-frequency vibrations (1300-1600 cm/sup -1/) are the important energy accepting modes for radiationless decay of the charge transfer excited states of OsL/sub 3//sup 2+/3+/, and the 10/sup 5/ - 10/sup 6/ differences in lifetimes between MLCT states of OsL/sub 3//sup 2 +/ complexes and the LMCT states of OsL/sub 3//sup 3 +/ complexes is largely due to the difference in their energy gaps. 1 table.
- Research Organization:
- Brookhaven National Lab., Upton, NY
- OSTI ID:
- 6972259
- Journal Information:
- ACS Symp. Ser.; (United States), Journal Name: ACS Symp. Ser.; (United States) Vol. 211; ISSN ACSMC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400104* -- Spectral Procedures-- (-1987)
AROMATICS
AZAARENES
AZINES
BIPYRIDINES
COMPARATIVE EVALUATIONS
COMPLEXES
DATA
DE-EXCITATION
ELECTROMAGNETIC RADIATION
ENERGY GAP
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
INFRARED SPECTRA
LASER RADIATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OSMIUM COMPLEXES
PHENANTHROLINES
PYRIDINES
RADIATIONLESS DECAY
RADIATIONS
SPECTRA
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENT COMPLEXES