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), Vol. 90:24
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BIPYRIDINES
EXCITED STATES
ELECTRON SPIN RESONANCE
MAGNETIC RESONANCE
PHOSPHORESCENCE
IMINES
ORGANOMETALLIC COMPOUNDS
RHODIUM COMPLEXES
EMISSION SPECTRA
EXPERIMENTAL DATA
LIFETIME
RADIATIONLESS DECAY
TRIPLETS
ULTRALOW TEMPERATURE
AZINES
COMPLEXES
DATA
DE-EXCITATION
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
HETEROCYCLIC COMPOUNDS
INFORMATION
LUMINESCENCE
MULTIPLETS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
RESONANCE
SPECTRA
TRANSITION ELEMENT COMPLEXES
400500* - Photochemistry
400201 - Chemical & Physicochemical Properties