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Updated: May 28, 2026

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Published on: August 18, 2017
Spectroscopy and fragmentation of undercoordinated bromoiridates
Jesse C Marcum1, Anna I Krylov, J Mathias Weber
1JILA , NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States.
Abstract:
We report gas-phase electronic photodissociation spectra of the undercoordinated bromoiridate complexes IrBr(4)(-) and IrBr(5)(-) at photon energies from 1 to 5.6 eV. Both ions have open-shell ground states with low-symmetry structures. The fragmentation is characterized by thresholds for the loss of one Br atom for IrBr(4)(-) and one or two Br atoms for IrBr(5)(-). The experimental spectra consist of ligand-to-metal charge transfer transitions and reveal a large density of electronic states that can be recovered by time-dependent density functional theory.
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