Ligand steric effects on the photophysics of bis- and tris(2,2'-bipyridine) complexes of rhodium(III)
The effects of 3,3'-dimethyl steric interactions on the luminescence of 2,2'-bipyridine complexes of rhodium(III) have been investigated. The tris complex, Rh(dmbpy)/sub 3//sup 3 +/, is found is display both metal-centered and ligand-centered emissions. The metal-centered emission is the dominant luminescence feature at 77 K, but the ligand-centered emission is enhanced relative to the metal-centered luminescence in fluid solutions. The bis complex, Rh(dmbpy)/sub 2/Cl/sub 2//sup +/, displays a dominant ligand field emission under all conditions that were studied. Reinvestigation of the luminescence of the tris(1,10-phenanthroline) and tris(2,2'-bipyridine) complexes of Rh(III) in fluid solutions indicates that these species emit only from ligand-centered excited states. Comparison of the 3,3'-dimethyl-2,2'-bipyridine and unsubstituted 2,2'-bipyridine complexes of Rh(III) indicates that both ligand-centered and metal-centered excited states have lower energies for the methyl-substituted complexes but the effect if larger for the metal-centered states. 21 references, 7 figures, 1 table.
- Research Organization:
- Univ. of California, Santa Barbara
- OSTI ID:
- 6313999
- Journal Information:
- Inorg. Chem.; (United States), Vol. 23:13
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RHODIUM COMPLEXES
CONFIGURATION MIXING
EXCITATION
BIPYRIDINES
CHELATES
ELECTRONIC STRUCTURE
EMISSION SPECTROSCOPY
EXCITED STATES
EXPERIMENTAL DATA
LIGANDS
LOW TEMPERATURE
LUMINESCENCE
MEDIUM TEMPERATURE
MOLECULAR STRUCTURE
STRUCTURAL CHEMICAL ANALYSIS
TIME DEPENDENCE
AZINES
COMPLEXES
DATA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
HETEROCYCLIC COMPOUNDS
INFORMATION
INTERACTIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)