ELECTRONIC PHOTODISSOCIATION SPECTROSCOPY OF GAS-PHASE IrBr$_n^{k-}$

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2008

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Ohio State University

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Iridium complex anions (IrBr62−, IrBr5− and IrBr4−) were studied using photodissociation spectroscopy in the photon energy range between 1.1 and 5.6 eV. These spectra probe the electronic structure of iridium bromide complexes as a function of the coordination number and metal oxidation state. The observed spectra for isolated IrBr62− contain similar features to its spectrum in aqueous solution. An analysis of the fragment channels reveals a tendency for formation of IrBr5− fragment ions in the visible while formation of IrBr4− fragment ions is favored in the ultraviolet. Spectra for IrBr5− and IrBr4− parent ions indicate that their preferred fragment channel is the loss of one or more neutral bromine atoms.

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Author Institution: JILA, NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309

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