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Tripathi JK, Srivastava AK. CF 4-n(SO 3) n ( n = 1–4): a new series of organic superhalogens. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2123748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Gutsev GL, López Peña HA, McPherson SL, Boateng DA, Ramachandran BR, Gutsev LG, Tibbetts KM. From Neutral Aniline to Aniline Trication: A Computational and Experimental Study. J Phys Chem A 2020; 124:3120-3134. [PMID: 32233368 DOI: 10.1021/acs.jpca.0c00686] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We report density functional theory computations and photoionization mass spectrometry measurements of aniline and its positively charged ions. The geometrical structures and properties of the neutral and singly, doubly, and triply positively charged aniline are computed using density functional theory with the generalized gradient approximation. At each charge, there are multiple isomers closely spaced in total energy. Whereas the lowest energy states of both neutral and cation have the same topology C6H5-NH2, the dication and trication have the C5NH5-CH2 topology with the nitrogen atom in the meta- and para-positions, respectively. We compute the dissociation pathways of all four charge states to NH or NH+ and NH2 or NH2+, depending on the initial charge of the aniline precursor. Dissociation leading to the formation of NH (from the neutral and cation) and NH+ (from the dication and trication) proceeds through multiple transition states. On the contrary, the dissociation of NH2 (from the neutral and cation) and NH2+ (from the dication and trication) is found to proceed without an activation energy barrier. The trication was found to be stable toward abstraction on NH+ and NH2+ by 0.96 and 0.18 eV, respectively, whereas the proton affinity of the trication is substantially higher, 1.98 eV. The mass spectra of aniline were recorded with 1300 nm, 20 fs pulses over the peak intensity range of 1 × 1013 to 3 × 1014 W cm-2. The analysis of the mass spectra suggests high stability of both dication and trication to fragmentation. The formation of the fragment NH+ and NH2+ ions is found to proceed via Coulomb explosion.
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Affiliation(s)
- G L Gutsev
- Department of Physics, Florida A&M University, Tallahassee, Florida 32307, United States
| | - H A López Peña
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - S L McPherson
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - D Ampadu Boateng
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - B R Ramachandran
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, United States
| | - L G Gutsev
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, United States.,Institute of Problems of Chemical Physics of Russian Academy of Sciences, Chernogolovka, Moscow District 142432, Russia
| | - K M Tibbetts
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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Affiliation(s)
- Karl K. Irikura
- Computational Chemistry Group, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8380
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Dìaz CC, Kaplan IG, Roszak S. Theoretical study of the electron affinities of the alkaline-earth tetramers possessing Td symmetry: Be4 and Mg4. J Mol Model 2005; 11:330-4. [PMID: 16007435 DOI: 10.1007/s00894-005-0251-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2004] [Accepted: 01/25/2005] [Indexed: 10/25/2022]
Abstract
The electron affinities of beryllium and magnesium tetramers are calculated at the ROMP2 level employing the Dunning-type aug-cc-pVQZ basis set. The vertical electron detachment energy (VEDE) amounts to 1.685 eV for Be4- and 0.943 eV for Mg4 . The decomposition of the VEDE into physical components and an atomic orbital population analysis are used to elucidate the nature of the outer electron binding in these anions. [Figure: see text]. The lowest unoccupied molecular orbitals in the ground state of Mg4 : a LUMO, symmetry A1, b LUMO + 1, symmetry T2; c the highest occupied molecular orbital (HOMO), symmetry A1 in the ground state of Mg4-.
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Affiliation(s)
- Cesar Carlos Dìaz
- Instituto de Investigaciones en Materiales, UNAM, Apdo Postal 70-360, 04510, México, DF, México
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Zhang N, Blowers P, Farrell J. Ab initio study of carbon-chlorine bond cleavage in carbon tetrachloride. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2005; 39:612-617. [PMID: 15707062 DOI: 10.1021/es049480a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Chlorinated solvents in groundwater are known to undergo reductive dechlorination reactions with Fe(ll)-containing minerals and with corroding metals in permeable-barrier treatment systems. This research investigated the effect of the reaction energy on the reaction pathway for C-Cl bond cleavage in carbon tetrachloride (CCl4). Hartree-Fock, density functional theory, and modified complete basis set ab initio methods were used to study adiabatic electron transfer to aqueous-phase CCl4. The potential energies associated with fragmentation of the carbon tetrachloride anion radical (CCl4-) into a trichloromethyl radical (CCl3) and a chloride ion (Cl-) were explored as a function of the carbon-chlorine bond distance during cleavage. The effect of aqueous solvation was investigated using a continuum conductor-like screening model. Solvation significantly lowered the energies of the reaction products, suggesting that dissociative electron transfer was enhanced by solvation. The potential energy curves in an aqueous medium indicate that reductive cleavage undergoes a change from an inner-sphere to an outer-sphere mechanism as the overall energy change for the reaction is increased. The activation energy for the reaction was found to be a linear function of the overall energy change, and the Marcus-Hush model was used to relate experimentally measured activation energies for CCl4 reduction to overall reaction energies. Experimentally measured activation energies for CCl4 reduction by corroding iron correspond to reaction energies that are insufficiently exergonic for promoting the outer-sphere mechanism. This suggests that the different reaction pathways that have been observed for CCl4 reduction by corroding iron arise from different catalytic interactions with the surface, and not from differences in energy of the transferred electrons.
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Affiliation(s)
- Nianliu Zhang
- Department of Chemical and Environmental Engineering, The University of Arizona, Tucson, Arizona 85721-0011, USA
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Kaplan IG, Dolgounitcheva O, Watts JD, Ortiz JV. Nondipole bound anions: Be2− and Be3−. J Chem Phys 2002. [DOI: 10.1063/1.1494801] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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Meunier M, Quirke N, Binesti D. The Calculation of the Electron Affinity of Atoms and Molecules. MOLECULAR SIMULATION 1999. [DOI: 10.1080/08927029908022116] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Gutsev GL, Rozyczko PB, Bartlett RJ, Weatherford CA. Does N2− exist? A coupled-cluster study. J Chem Phys 1999. [DOI: 10.1063/1.478408] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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