title: Luminescence of the nonclassical homoleptic metal carbonyl complex [Rh(CO4]+.
abstract: The nonclassical [Rh(CO)(4)](+) cation is luminescent at low temperature with a peak maximum at 19640 cm(-1) and a full-width at half-maximum of 2900 cm(-1). Both the solution absorption and low-temperature solid-state luminescence spectra of the [Rh(CO)(4)](1-Et-CB(11)F(11)) salt are reported. The cesium salt of the [1-Et-CB(11)F(11)](-) counterion is also luminescent (with a peak maximum at 22650 cm(-1)), but the emission maximum of [Rh(CO)(4)](+) is lower in energy. The Rh-C bond length changes of approximately 0.07 A in the excited state are calculated. The calculated bond length changes in the nonclassical [Rh(CO)(4)](+) ion are not very different from those in classical complexes.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles 90095, USA.
authors.forename: Theodore W
authors.initials: TW
authors.lastname: Bitner
authors.forename: Jeffrey I
authors.initials: JI
authors.lastname: Zink
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Havighurst
authors.forename: Steven H
authors.initials: SH
authors.lastname: Strauss