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Watson PD, McKinley AJ, Wild DA. Photoelectron Spectroscopy and High-Level Ab Initio Calculations of the Iodide-Methylperoxy Radical Complex. J Phys Chem A 2022; 126:3072-3079. [PMID: 35549219 DOI: 10.1021/acs.jpca.2c00299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Anion photoelectron spectroscopy has been used to investigate the structure and dynamics of CH3OOI- van der Waals complexes. Peaks within the photoelectron spectrum are attributed to photodetachment to the perturbed 2P3/2 state of I···CH3OO (3.46 eV) and the two 2P states of bare iodine. A broad feature at 1.7-2.4 eV is attributed to detachment to the excited singlet states from two O2-···CH3I complexes. This represents the first anion photoelectron spectroscopy of a halide-bound methylperoxy radical species. Complex structures have been optimized using MP2/aug-cc-pVQZ with single-point energies at W1w theory for ground-state complexes and NEVPT2 for photodetachment to excited O2. Interactions are dominated by electrostatics, with the anion species interacting with the methyl pocket of the solvating molecule, suggesting conversion via an SN2 mechanism, and excess energy leading to complex dissociation within the timescale of mass spectrometry. The calculated W1w Gibbs energies suggest that while an electron transfer (ET) pathway to conversion is available, it is comparatively unfavored.
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Affiliation(s)
- Peter D Watson
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Allan J McKinley
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Duncan A Wild
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia 6009, Australia
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Halides and the carbon-carbon double bond: Interactions of ethylene with bromide and iodide. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Haakansson CT, Corkish TR, Watson PD, Robinson HT, Tsui T, McKinley AJ, Wild DA. Spectroscopic Investigation of Chalcogen Bonding: Halide-Carbon Disulfide Complexes. Chemphyschem 2021; 22:808-812. [PMID: 33704887 DOI: 10.1002/cphc.202100148] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Indexed: 11/09/2022]
Abstract
A combined experimental and theoretical approach has been used to study intermolecular chalcogen bonding. Specifically, the chalcogen bonding occurring between halide anions and CS2 molecules has been investigated using both anion photoelectron spectroscopy and high-level CCSD(T) calculations. The relative strength of the chalcogen bond has been determined computationally using the complex dissociation energies as well as experimentally using the electron stabilisation energies. The anion complexes featured dissociation energies on the order of 47 kJ/mol to 37 kJ/mol, decreasing with increasing halide size. Additionally, the corresponding neutral complexes have been examined computationally, and show three loosely-bound structural motifs and a molecular radical.
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Affiliation(s)
- Christian T Haakansson
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Timothy R Corkish
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Peter D Watson
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Hayden T Robinson
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Terrence Tsui
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Allan J McKinley
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Duncan A Wild
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
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Haakansson CT, Corkish TR, Watson PD, McKinley AJ, Wild DA. The bromide-bromomethyl radical dimer complex: Anion photoelectron spectroscopy and CCSD(T) calculations. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.138060] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Wild DA. PhysChem 2019: RACI Australian Conference on Physical Chemistry, Perth, 11–14 February 2019. Aust J Chem 2020. [DOI: 10.1071/chv73n8_fo] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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