Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 114, Issue 42, Pages 11244-11251Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp103173d
Keywords
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Funding
- National Science Foundation [CHE-1036387]
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences
- NKBRSF [2006CB932305, 2007CB815200]
- NSFC in China [20933003]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1036387] Funding Source: National Science Foundation
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We report a combined experimental and theoretical investigation of MI2- (M = Cs, Cu, Ag, Au) to explore the chemical bonding in the group IA and IB diiodide complexes. Both photoelectron imaging and low-temperature photoelectron spectroscopy are applied to MI2- (M = Cs, Cu, Au), yielding vibrationally resolved spectra for CuI2- and AuI2- and accurate electron affinities, 4.52 +/- 0.02, 4.256 +/- 0.010, and 4.226 +/- 0.010 eV for CsI2, CuI2, and AuI2, respectively. Spin-orbit coupling is found to be important in all the diiodide complexes and ab initio calculations including spin-orbit effects allow quantitative assignments of the observed photoelectron spectra. A variety of chemical bonding analyses (charge population, bond order, and electron localization functions) have been carried out, revealing a gradual transition from the expected ionic behavior in CsI2- to relatively strong covalent bonding in AuI2-. Both relativistic effects and electron correlation are shown to enhance the covalency in the gold diiodide complex.
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