Solvent effects on metal-to-ligand charge-transfer bands in ortho-metalated complexes of iridium(III): Estimates of transition dipole moments

Journal Article · Thu Jan 24 04:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100155a025· OSTI ID:5974535

Wilde, A P; Watts, R J ^[1]

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1. Univ. of California, Santa Barbara (USA)

Shifts in the absorption and emission maxima of several ortho-metalated complexes of Ir(III) in a series of solvents are reported. These complexes contain combinations of the ortho-metalating ligands 2-phenylpyridine or benzo(h)quinoline and the chelating ligands 2,2{prime}-bipyridine or 1,10-phenanthroline bonded to the Ir(III). The solvent-induced shifts are interpreted in terms of theoretical treatments due to McRae and to Marcus. Each of these treatments leads to estimates of transition dipoles associated with absorption, and the sign and magnitude of the transition dipole indicate that the direction of the excited-state dipole is opposite that of the ground-state dipole. This result is consistent with prior assignments of the absorption band to a metal-to-ligand charge-transfer excited state associated with the chelating ligand.

• DOE Contract Number: FG03-88ER13842
• OSTI ID: 5974535
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:2; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ABSORPTION SPECTROSCOPY
COMPLEXES
DATA
DIPOLE MOMENTS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
INFORMATION
IRIDIUM COMPLEXES
MEASURING METHODS
MEDIUM TEMPERATURE
NUMERICAL DATA
SOLVENT PROPERTIES
SPECTRAL SHIFT
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES