The Excited-state Absorption and Phosphorescence of Rhodium(III) Compounds at Room Temperature

The excited states of rhodium(III) compounds including [Rh(4,7-diphenyl-1,10-phenanthroline)3]3+ ([Rh(dp-phen)3]3+), [Rh(1,10-phenanthroline)3]3+ ([Rh(phen)3]3+), [RhCl2(dp-phen)2]+, and [RhCl2(phen)2]+, have been investigated by means of emission spectroscopy and laser photolysis spectroscopy. The...

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Bibliographic Details
Published in:	Bulletin of the Chemical Society of Japan 1984-12, Vol.57 (12), p.3391-3394
Main Authors:	Ohno, Takeshi, Kato, Shunji
Format:	Article
Language:	eng
Subjects:	Atomic and molecular physics Exact sciences and technology Fluorescence and phosphorescence radiationless transitions, quenching (intersystem crossing, internal conversion) Molecular properties and interactions with photons Physics
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Summary:	The excited states of rhodium(III) compounds including [Rh(4,7-diphenyl-1,10-phenanthroline)3]3+ ([Rh(dp-phen)3]3+), [Rh(1,10-phenanthroline)3]3+ ([Rh(phen)3]3+), [RhCl2(dp-phen)2]+, and [RhCl2(phen)2]+, have been investigated by means of emission spectroscopy and laser photolysis spectroscopy. The transient species with the lifetime of 0.055–72 μs are identified as the triplet (π-π*) excited state of the ligand for [Rh(dp-phen)3]3+ and [Rh(phen)3]3+ and as the triplet ligand-field excited states for [RhCl2(dp-phen)2]+ and [RhCl2(phen)2]+. The molar absorption coefficients of the excited states are 9600 M−1 cm−1 at 550 nm for [Rh(dp-phen)3]3+, 2750 M−1 cm−1 at 560 nm for [RhCl2(dp-phen)2]+, 2300 M−1 cm−1 at 510 nm for [Rh(phen)3]3+, and 1600 M−1 cm−1 at 550 nm for [RhCl2(phen)2]+. The lifetime of the ligand-field excited state of [RhCl2(phen)2]+ (700 ns in acetonitrile) decreases to 55 ns in water.
ISSN:	0009-2673 1348-0634