Phosphorescence and zero-field optically detected magnetic resonance studies of the lowest excited triplet states of organometallic diimine complexes. 1. (Rh(bpy)/sub 3/)/sup 3 +/ and (Rh(phen)/sub 3/)/sup 3 +/
The authors have made spectroscopic and optically detected magnetic resonance studies on /sup 3/..pi pi..* (Rh(bpy)/sub 3/)/sup 3 +/ and (Rh(phen)/sub 3/)/sup 3 +/ at liquid helium temperature. They have observed a well-resolved phosphorescence spectrum of (Rh(phen)/sub 3/)(BF/sub 4/)/sub 3/ that resembles that of 1,10-phenanthroline except for changes in some vibrational frequencies. The triplet lifetimes of the Rh complexes were compared with those of the Cd and Ir complexes in the light of the effect of d..pi..* states. Zero-field (zf) ODMR signals of the /sup 3/..pi pi..*Rh complexes were observed, and triplet sublevel properties, such as zf splittings (zfs) and radiative and nonradiative decay rate constants, were obtained. Very interestingly, small zfs (3-5 GHz) were observed, contrary to previous estimates. Rationalization of this observation is given. On the basis of the obtained data they discuss the structures, zf schemes, and radiative and nonradiative mechanisms in the /sup 3/..pi pi..* Rh complexes.
- Research Organization:
- Kyoto Univ., Japan
- OSTI ID:
- 7031796
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:24; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
AZINES
BIPYRIDINES
COMPLEXES
DATA
DE-EXCITATION
ELECTRON SPIN RESONANCE
EMISSION SPECTRA
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
IMINES
INFORMATION
LIFETIME
LUMINESCENCE
MAGNETIC RESONANCE
MULTIPLETS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHOSPHORESCENCE
PYRIDINES
RADIATIONLESS DECAY
RESONANCE
RHODIUM COMPLEXES
SPECTRA
TRANSITION ELEMENT COMPLEXES
TRIPLETS
ULTRALOW TEMPERATURE