1
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Korotenko V, Zipse H. The stability of oxygen-centered radicals and its response to hydrogen bonding interactions. J Comput Chem 2024; 45:101-114. [PMID: 37747356 DOI: 10.1002/jcc.27221] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/10/2023] [Accepted: 08/11/2023] [Indexed: 09/26/2023]
Abstract
The stability of various alkoxy/aryloxy/peroxy radicals, as well as TEMPO and triplet dioxygen (3 O2 ) has been explored at a variety of theoretical levels. Good correlations between RSEtheor and RSEexp are found for hybrid DFT methods, for compound schemes such as G3B3-D3, and also for DLPNO-CCSD(T) calculations. The effects of hydrogen bonding interactions on the stability of oxygen-centered radicals have been probed by addition of a single solvating water molecule. While this water molecule always acts as a H-bond donor to the oxygen-centered radical itself, it can act as a H-bond donor or acceptor to the respective closed-shell parent.
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Affiliation(s)
| | - Hendrik Zipse
- Department of Chemistry, LMU Munich, Munich, Germany
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2
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3D Characterization of the Molecular Neighborhood of •OH Radical in High Temperature Water by MD Simulation and Voronoi Polyhedra. Int J Mol Sci 2023; 24:ijms24043294. [PMID: 36834704 PMCID: PMC9963584 DOI: 10.3390/ijms24043294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 01/27/2023] [Accepted: 02/03/2023] [Indexed: 02/10/2023] Open
Abstract
Understanding the properties of the •OH radical in aqueous environments is essential for biochemistry, atmospheric chemistry, and the development of green chemistry technologies. In particular, the technological applications involve knowledge of microsolvation of the •OH radical in high temperature water. In this study, the classical molecular dynamics (MD) simulation and the technique based on the construction of Voronoi polyhedra were used to provide 3D characteristics of the molecular vicinity of the aqueous hydroxyl radical (•OHaq). The statistical distribution functions of metric and topological features of solvation shells represented by the constructed Voronoi polyhedra are reported for several thermodynamic states of water, including the pressurized high-temperature liquid and supercritical fluid. Calculations showed a decisive influence of the water density on the geometrical properties of the •OH solvation shell in the sub- and supercritical region: with the decreasing density, the span and asymmetry of the solvation shell increase. We also showed that the 1D analysis based on the oxygen-oxygen radial distribution functions (RDFs) overestimates the solvation number of •OH and insufficiently reflects the influence of transformations in the hydrogen-bonded network of water on the structure of the solvation shell.
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3
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Lin SY, Huang WJ, Chou SL, Chen HF, Wu YJ. Formation of Para-H 2O by Vacuum-UV Photolysis of O 2 in Solid Hydrogen: Implication for Astrochemistry. J Phys Chem Lett 2022; 13:10439-10446. [PMID: 36326470 DOI: 10.1021/acs.jpclett.2c02665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The observation that the ortho to para ratio (OPR) of interstellar H2O is smaller than 3 is an important yet unresolved subject in astronomy. We irradiated O2 embedded in solid H2 at 3 K with vacuum-ultraviolet (VUV) light and observed IR lines associated with para-H2O (denoted as pH2O) and nonrotating H2O-(oH2)n (where oH2 denotes ortho-H2) but no lines associated with ortho-H2O (denoted as oH2O). After maintaining the matrix in darkness for ∼30 h, the amount of pH2O decreased, accompanied by an increase in H2O-(oH2)n via diffusion of oH2. After that, the continuous nuclear-spin conversion from oH2 to para-H2 (denoted as pH2) in solid H2 over time resulted in the conversion of nonrotating H2O-(oH2)n to rotating pH2O in solid pH2. The observation of the formation and conversion of pH2O in our experiment suggests a plausible route in which VUV irradiation of O2 and H2 adsorbed on grain surfaces might be responsible for the smaller OPR of interstellar H2O.
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Affiliation(s)
- Shu-Yu Lin
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu300093, Taiwan
| | - Wen-Jian Huang
- National Synchrotron Radiation Research Center, Hsinchu30076, Taiwan
| | - Sheng-Lung Chou
- National Synchrotron Radiation Research Center, Hsinchu30076, Taiwan
| | - Hui-Fen Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100 Shih-Chuan First Road, Kaohsiung80708, Taiwan
| | - Yu-Jong Wu
- Department of Applied Chemistry and Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu300093, Taiwan
- National Synchrotron Radiation Research Center, Hsinchu30076, Taiwan
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4
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Hadizadeh MH, Pan Z, Azamat J. Investigation of OH radical in the water nanodroplet during vapor freezing process: An ab initio molecular dynamics study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117597] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Tahsildaran F FS, Moore B, Bashiri T, Otani H, Djuricanin P, Malekfar R, Farahbod AH, Momose T. VUV photochemistry and nuclear spin conversion of water and water-orthohydrogen complexes in parahydrogen crystals at 4 K. Phys Chem Chem Phys 2021; 23:4094-4106. [PMID: 33586746 DOI: 10.1039/d0cp04523c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Samples of H2O, HDO, and D2O were isolated in solid parahydrogen (pH2) matrices and irradiated by vacuum ultraviolet (VUV) radiation at 147 nm. Fourier-Transform Infrared (FTIR) spectra showed a clear depletion of D2O and an enrichment of both HDO and H2O by 147 nm irradiation. These irradiation-dependent changes are attributed to the production of OH and/or OD radicals through photodissociations of H2O, HDO, and D2O. The radicals subsequently react with the hydrogen matrix, leading to the observed enrichment of H2O. No trace of isolated OH or OD was detected in the FTIR spectra, indicating that the OH/OD radicals react with the surrounding matrix hydrogen molecules via quantum tunneling within our experimental timescale. The observed temporal changes in concentrations, especially the increase of HDO concentration during VUV irradiation, can be interpreted by a model with a rapid conversion from orthohydrogen (oH2) to pH2 in water-oH2 complexes upon VUV photodissociation, indicating either the acceleration of the nuclear spin conversion (NSC) of H2 due to the magnetic moment of the intermediate OH/OD radical, or the preferential reaction of the OH/OD radical with a nearby oH2 molecule over other pH2 molecules. We have also identified and quantified an anomalously slow NSC of H2O and D2O complexed with oH2 in solid pH2.
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Affiliation(s)
- Fatemeh S Tahsildaran F
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada. and Atomic and Molecular Physics Group, Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
| | - Brendan Moore
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
| | - Termeh Bashiri
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
| | - Hatsuki Otani
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
| | - Pavle Djuricanin
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
| | - Rasoul Malekfar
- Atomic and Molecular Physics Group, Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
| | - Amir Hossein Farahbod
- Research School of Plasma Physics and Nuclear Fusion, Research Institute of Nuclear Sciences and Technologies, AEOI, Tehran, Iran
| | - Takamasa Momose
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
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6
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Apostolidou C. Vibrational Spectra of the OH Radical in Water: Ab Initio Molecular Dynamics Simulations and Quantum Chemical Calculations Using Hybrid Functionals. ADVANCED THEORY AND SIMULATIONS 2020. [DOI: 10.1002/adts.202000174] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Christina Apostolidou
- Mulliken Center for Theoretical Chemistry Institute of Physical and Theoretical Chemistry Rheinische Friedrich‐Wilhelms‐Universität Bonn Beringstraße 4 Bonn 53115 Germany
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7
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Frandsen BN, Farahani S, Vogt E, Lane JR, Kjaergaard HG. Spectroscopy of OSSO and Other Sulfur Compounds Thought to be Present in the Venus Atmosphere. J Phys Chem A 2020; 124:7047-7059. [DOI: 10.1021/acs.jpca.0c04388] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Benjamin N. Frandsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Sara Farahani
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
| | - Emil Vogt
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Joseph R. Lane
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
| | - Henrik G. Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
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8
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Apostolidou C. OH radical in water from ab initio molecular dynamics simulation employing hybrid functionals. J Chem Phys 2019. [DOI: 10.1063/1.5107479] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Christina Apostolidou
- Mulliken Center for Theoretical Chemistry, Institute of Physical and Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstraße 4, 53115 Bonn, Germany
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9
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Zheng R, Zhu Y, Song H. Mode-specific quantum dynamics and kinetics of the hydrogen abstraction reaction OH + H2O → H2O + OH. Phys Chem Chem Phys 2019; 21:24054-24060. [DOI: 10.1039/c9cp04721b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synergistic effect between the reactant stretching and bending modes on promoting the reaction.
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Affiliation(s)
- Rui Zheng
- School of Physics and Electronics
- North China University of Water Resources and Electric Power
- Zhengzhou 450011
- China
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
| | - Yongfa Zhu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Wuhan Institute of Physics and Mathematics
- Chinese Academy of Sciences
- Wuhan 430071
- China
| | - Hongwei Song
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Wuhan Institute of Physics and Mathematics
- Chinese Academy of Sciences
- Wuhan 430071
- China
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10
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High Temperature Aqueous Solvent Effect on Stretching Vibrations of the Hydroxyl Radical – MD Simulation Study of Spectral Shifts and Hydrogen Bond Statistics. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2018.07.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Zhu Y, Ping L, Bai M, Liu Y, Song H, Li J, Yang M. Tracking the energy flow in the hydrogen exchange reaction OH + H 2O → H 2O + OH. Phys Chem Chem Phys 2018; 20:12543-12556. [PMID: 29693667 DOI: 10.1039/c8cp00938d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The prototypical hydrogen exchange reaction OH + H2O → H2O + OH has attracted considerable interest due to its importance in a wide range of chemically active environments. In this work, an accurate global potential energy surface (PES) for the ground electronic state was developed based on ∼44 000 ab initio points at the level of UCCSD(T)-F12a/aug-cc-pVTZ. The PES was fitted using the fundamental invariant-neural network method with a root mean squared error of 4.37 meV. The mode specific dynamics was then studied by the quasi-classical trajectory method on the PES. Furthermore, the normal mode analysis approach was employed to calculate the final vibrational state distribution of the product H2O, in which a new scheme to acquire the Cartesian coordinates and momenta of each atom in the product molecule from the trajectories was proposed. It was found that, on one hand, excitation of either the symmetric stretching mode or the asymmetric stretching mode of the reactant H2O promotes the reaction more than the translational energy, which can be rationalized by the sudden vector projection model. On the other hand, the relatively higher efficacy of exciting the symmetric stretching mode than that of the asymmetric stretching mode is caused by the prevalence of the indirect mechanism at low collision energies and the stripping mechanism at high collision energies. In addition, the initial collision energy turns ineffectively into the vibrational energy of the products H2O and OH while a fraction of the energy transforms into the rotational energy of the product H2O. Fundamental excitation of the stretching modes of H2O results in the product H2O having the highest population in the fundamental state of the asymmetric stretching mode, followed by the ground state and the fundamental state of the symmetric stretching mode.
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Affiliation(s)
- Yongfa Zhu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
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12
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Ryazantsev SV, Duarte L, Feldman VI, Khriachtchev L. VUV photochemistry of the H2O⋯CO complex in noble-gas matrices: formation of the OH⋯CO complex and the HOCO radical. Phys Chem Chem Phys 2017; 19:356-365. [DOI: 10.1039/c6cp06954a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
VUV photolysis of the H2O⋯CO complexes leads to the formation of the OH⋯CO radical–molecule complexes and trans-HOCO radicals.
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Affiliation(s)
- Sergey V. Ryazantsev
- Department of Chemistry
- Lomonosov Moscow State University
- Moscow 119991
- Russia
- Department of Chemistry
| | - Luís Duarte
- Department of Chemistry
- University of Helsinki
- FI-00014 Helsinki
- Finland
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13
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Bai M, Lu D, Li J. Quasi-classical trajectory studies on the full-dimensional accurate potential energy surface for the OH + H2O = H2O + OH reaction. Phys Chem Chem Phys 2017; 19:17718-17725. [DOI: 10.1039/c7cp02656k] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first accurate PES for the OH + H2O reaction is developed by using the permutation invariant polynomial-neural network method to fit ∼48 000 CCSD(T)-F12a/AVTZ calculated points.
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Affiliation(s)
- Mengna Bai
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
| | - Dandan Lu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
| | - Jun Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
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14
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Gao A, Li G, Peng B, Xie Y, Schaefer HF. The Symmetric Exchange Reaction OH + H2O → H2O + OH: Convergent Quantum Mechanical Predictions. J Phys Chem A 2016; 120:10223-10230. [DOI: 10.1021/acs.jpca.6b10008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aifang Gao
- School
of Water Resources and Environment, Hebei GEO University, Shijiazhuang 050031, China
- Hebei Key Laboratory of Sustained Utilization and Development of Water Resources, Shijiazhuang, Hebei Province 050031, China
- Center
for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Guoliang Li
- MOE
Key Laboratory of Theoretical Chemistry of the Environment, Center
for Computational Quantum Chemistry, South China Normal University, Guangzhou 510006, China
| | - Bin Peng
- MOE
Key Laboratory of Theoretical Chemistry of the Environment, Center
for Computational Quantum Chemistry, South China Normal University, Guangzhou 510006, China
| | - Yaoming Xie
- Center
for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F. Schaefer
- Center
for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
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15
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Wang H, Li G, Li QS, Xie Y, Schaefer HF. I + (H2O)2 → HI + (H2O)OH Forward and Reverse Reactions. CCSD(T) Studies Including Spin-Orbit Coupling. J Phys Chem B 2016; 120:1743-8. [PMID: 26562487 DOI: 10.1021/acs.jpcb.5b09253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The potential energy profile for the atomic iodine plus water dimer reaction I + (H2O)2 → HI + (H2O)OH has been explored using the "Gold Standard" CCSD(T) method with quadruple-ζ correlation-consistent basis sets. The corresponding information for the reverse reaction HI + (H2O)OH → I + (H2O)2 is also derived. Both zero-point vibrational energies (ZPVEs) and spin-orbit (SO) coupling are considered, and these notably alter the classical energetics. On the basis of the CCSD(T)/cc-pVQZ-PP results, including ZPVE and SO coupling, the forward reaction is found to be endothermic by 47.4 kcal/mol, implying a significant exothermicity for the reverse reaction. The entrance complex I···(H2O)2 is bound by 1.8 kcal/mol, and this dissociation energy is significantly affected by SO coupling. The reaction barrier lies 45.1 kcal/mol higher than the reactants. The exit complex HI···(H2O)OH is bound by 3.0 kcal/mol relative to the asymptotic limit. At every level of theory, the reverse reaction HI + (H2O)OH → I + (H2O)2 proceeds without a barrier. Compared with the analogous water monomer reaction I + H2O → HI + OH, the additional water molecule reduces the relative energies of the entrance stationary point, transition state, and exit complex by 3-5 kcal/mol. The I + (H2O)2 reaction is related to the valence isoelectronic bromine and chlorine reactions but is distinctly different from the F + (H2O)2 system.
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Affiliation(s)
| | - Guoliang Li
- Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | | | - Yaoming Xie
- Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
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16
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Hernandez FJ, Brice JT, Leavitt CM, Liang T, Raston PL, Pino GA, Douberly GE. Mid-infrared signatures of hydroxyl containing water clusters: Infrared laser Stark spectroscopy of OH–H2O and OH(D2O)n (n = 1-3). J Chem Phys 2015; 143:164304. [DOI: 10.1063/1.4933432] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Federico J. Hernandez
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
- INFIQC, Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, Pabellón, X5000HUA Córdoba, Argentina
| | - Joseph T. Brice
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | | | - Tao Liang
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Paul L. Raston
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia 22807, USA
| | - Gustavo A. Pino
- INFIQC, Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, Pabellón, X5000HUA Córdoba, Argentina
| | - Gary E. Douberly
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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17
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Li G, Wang H, Li QS, Xie Y, Schaefer HF. The Reaction between Bromine and the Water Dimer and the Highly Exothermic Reverse Reaction. J Comput Chem 2015; 37:177-82. [DOI: 10.1002/jcc.23951] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 04/28/2015] [Accepted: 04/30/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Guoliang Li
- MOE Key Laboratory of Theoretical Chemistry of the Environment; Center for Computational Quantum Chemistry, South China Normal University; Guangzhou 510006 China
- Guangzhou Key Laboratory of Materials for Energy Conversion and Storage; School of Chemistry and Environment; South China Normal University; Guangzhou 510006 China
- Center for Computational Quantum Chemistry; University of Georgia; Athens Georgia 30602
| | - Hui Wang
- MOE Key Laboratory of Theoretical Chemistry of the Environment; Center for Computational Quantum Chemistry, South China Normal University; Guangzhou 510006 China
| | - Qian-Shu Li
- MOE Key Laboratory of Theoretical Chemistry of the Environment; Center for Computational Quantum Chemistry, South China Normal University; Guangzhou 510006 China
| | - Yaoming Xie
- Center for Computational Quantum Chemistry; University of Georgia; Athens Georgia 30602
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry; University of Georgia; Athens Georgia 30602
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18
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Khriachtchev L. Matrix-isolation studies of noncovalent interactions: more sophisticated approaches. J Phys Chem A 2015; 119:2735-46. [PMID: 25679775 DOI: 10.1021/jp512005h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Noncovalent interactions are crucial for many physical, chemical, and biological phenomena. Matrix isolation is a powerful method to study noncovalent interactions, including hydrogen-bonded species, and it has been extensively used in this field. However, there are difficult situations, such as in the case of species that are impossible to prepare in the gas phase. In this article, we describe some advanced approaches allowing studies of complexes that are problematic for the traditional methods. Photolysis of a suitable precursor in a matrix can lead to a large concentration of 1:1 complexes, which are otherwise very difficult to prepare (e.g., the H2O···O complex). Photolysis of species combined with annealing can lead to complexes of molecules with mobile atoms (e.g., the same H2O···O complex). Simultaneous photolysis of two species combined with annealing can produce complexes of radicals via reactions of the photogenerated complexes with mobile atoms (e.g., the H2O···HCO complex). Interaction of noble-gas (Ng) hydrides with other species is another topic (e.g., the N2···HArF complex) and very large blue shifts of the H-Ng stretching modes are normally observed for these systems. Complexes and dimers of the higher-energy conformer of formic acid have been prepared by using selective vibrational excitation of the ground-state conformer. The higher-energy conformer of formic acid can be efficiently stabilized in the complexes with strong hydrogen bonding. We also consider some problematic cases when the changes in the vibrational frequencies of the 1:1 complexes are very small (e.g., the phenol···Xe complex) and when the complex formation is prevented by strong solvation in the matrix (e.g., species in solid xenon).
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Affiliation(s)
- Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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19
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Sander W, Roy S, Bravo-Rodriguez K, Grote D, Sanchez-Garcia E. The Benzylperoxyl Radical as a Source of Hydroxyl and Phenyl Radicals. Chemistry 2014; 20:12917-23. [DOI: 10.1002/chem.201402459] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Indexed: 11/10/2022]
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20
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Li G, Wang H, Li QS, Xie Y, Schaefer HF. The exothermic HCl + OH·(H2O) reaction: removal of the HCl + OH barrier by a single water molecule. J Chem Phys 2014; 140:124316. [PMID: 24697450 DOI: 10.1063/1.4869518] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The entrance complex, transition state, and exit complex for the title reaction have been investigated using the CCSD(T) method with correlation consistent basis sets up to cc-pVQZ. The stationary point geometries for the reaction are related to but different from those for the water monomer reaction HCl + OH → Cl + H2O. Our most important conclusion is that the hydrogen-bonded water molecule removes the classical barrier entirely. For the endothermic reverse reaction Cl + (H2O)2, the second water molecule lowers the relative energies of the entrance complex, transition state, and exit complex by about 4 kcal/mol. The title reaction is exothermic by 17.7 kcal/mol. The entrance complex HCl⋯OH·(H2O) is bound by 6.9 kcal/mol relative to the separated reactants. The classical barrier height for the reverse reaction is predicted to be 16.5 kcal/mol. The exit complex Cl⋯(H2O)2 is found to lie 6.8 kcal/mol below the separated products. The potential energy surface for the Cl + (H2O)2 reaction is radically different from that for the valence isoelectronic F + (H2O)2 system.
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Affiliation(s)
- Guoliang Li
- MOE Key Laboratory of Theoretical Chemistry of the Environment, Center for Computational Quantum Chemistry, South China Normal University, Guangzhou 510006, China
| | - Hui Wang
- MOE Key Laboratory of Theoretical Chemistry of the Environment, Center for Computational Quantum Chemistry, South China Normal University, Guangzhou 510006, China
| | - Qian-Shu Li
- MOE Key Laboratory of Theoretical Chemistry of the Environment, Center for Computational Quantum Chemistry, South China Normal University, Guangzhou 510006, China
| | - Yaoming Xie
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
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21
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Codorniu-Hernández E, Boese AD, Kusalik PG. The hemibond as an alternative condensed phase structure for the hydroxyl radical. CAN J CHEM 2013. [DOI: 10.1139/cjc-2012-0520] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Despite the critical importance of the hydroxyl radical in major scientific fields, there are still open questions on the behavior of this species in the aqueous phase. In particular, there has been much debate on the existence of a hemibonded interaction between the hydroxyl radical and water molecules. While some reports indicate that the hemibonded radical might explain some experimental data, others have claimed that this interaction is simply a density functional theory (DFT) artifact. Here, we provide results from high level (basis set limit of coupled-cluster levels up to single, double, triple excitations (CCSD(T)) and beyond) ab initio calculations of different OH•(H2O)n clusters in the gas phase to accurately explore the existence of the hemibonded interaction and its energy difference with respect to other well-defined hydrogen bond interactions. Additional comparisons with second order perturbation theory (MP2) and DFT are also presented. Constrained molecular dynamics was applied to determine the free energy for the formation/disruption and ice systems. Overall, our findings confirm that the hemibond can be an alternative structure for the hydroxyl radical in the condensed phase when the formation of hydrogen bonds is impeded. These results will aid the understanding of theoretical and experimental data and help future experimental designs for the detection of this important species.
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Affiliation(s)
| | - A. Daniel Boese
- Department of Chemistry, Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam, Germany
| | - Peter G. Kusalik
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
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22
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Cao Q, Berski S, Räsänen M, Latajka Z, Khriachtchev L. Spectroscopic and Computational Characterization of the HCO···H2O Complex. J Phys Chem A 2013; 117:4385-93. [DOI: 10.1021/jp4009477] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qian Cao
- Department of Chemistry, P.O. Box 55, FIN-00014, University of Helsinki, Finland
| | - Slawomir Berski
- Faculty of Chemistry, University of Wroclaw, 14, F. Joliot-Curie Str., 50-383 Wroclaw, Poland
| | - Markku Räsänen
- Department of Chemistry, P.O. Box 55, FIN-00014, University of Helsinki, Finland
| | - Zdzislaw Latajka
- Faculty of Chemistry, University of Wroclaw, 14, F. Joliot-Curie Str., 50-383 Wroclaw, Poland
| | - Leonid Khriachtchev
- Department of Chemistry, P.O. Box 55, FIN-00014, University of Helsinki, Finland
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23
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Zhang T, Wang W, Li C, Du Y, Lü J. Catalytic effect of a single water molecule on the atmospheric reaction of HO2 + OH: fact or fiction? A mechanistic and kinetic study. RSC Adv 2013. [DOI: 10.1039/c3ra40341f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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24
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Do NH, Cooper PD. Formation and Reaction of Oxidants in Water Ice Produced from the Deposition of RF-Discharged Rare Gas and Water Mixtures. J Phys Chem A 2012; 117:153-9. [PMID: 23237388 DOI: 10.1021/jp3090556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nhut H. Do
- Department of Chemistry and Biochemistry, George Mason University, 4400 University Drive, MSN
3E2 Fairfax, Virginia 22030, United States
| | - Paul D. Cooper
- Department of Chemistry and Biochemistry, George Mason University, 4400 University Drive, MSN
3E2 Fairfax, Virginia 22030, United States
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25
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Jacox ME, Thompson WE. Infrared Spectra of Products of the Reaction of H Atoms with O2 Trapped in Solid Neon: HO2, HO2+, HOHOH–, and H2O(HO). J Phys Chem A 2012; 117:9380-90. [DOI: 10.1021/jp310849s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marilyn E. Jacox
- Sensor
Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland
20899-8441, United States
| | - Warren E. Thompson
- Sensor
Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland
20899-8441, United States
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26
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Buszek RJ, Barker JR, Francisco JS. Water Effect on the OH + HCl Reaction. J Phys Chem A 2012; 116:4712-9. [DOI: 10.1021/jp3025107] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Robert J. Buszek
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084,
United States
| | - John R. Barker
- Department
of Atmospheric, Oceanic
and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
| | - Joseph S. Francisco
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084,
United States
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27
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Buszek RJ, Torrent-Sucarrat M, Anglada JM, Francisco JS. Effects of a single water molecule on the OH + H2O2 reaction. J Phys Chem A 2012; 116:5821-9. [PMID: 22455374 DOI: 10.1021/jp2077825] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect of a single water molecule on the reaction between H(2)O(2) and HO has been investigated by employing MP2 and CCSD(T) theoretical approaches in connection with the aug-cc-PVDZ, aug-cc-PVTZ, and aug-cc-PVQZ basis sets and extrapolation to an ∞ basis set. The reaction without water has two elementary reaction paths that differ from each other in the orientation of the hydrogen atom of the hydroxyl radical moiety. Our computed rate constant, at 298 K, is 1.56 × 10(-12) cm(3) molecule(-1) s(-1), in excellent agreement with the suggested value by the NASA/JPL evaluation. The influence of water vapor has been investigated by considering either that H(2)O(2) first forms a complex with water that reacts with hydroxyl radical or that H(2)O(2) reacts with a previously formed H(2)O·OH complex. With the addition of water, the reaction mechanism becomes much more complex, yielding four different reaction paths. Two pathways do not undergo the oxidation reaction but an exchange reaction where there is an interchange between H(2)O(2)·H(2)O and H(2)O·OH complexes. The other two pathways oxidize H(2)O(2), with a computed total rate constant of 4.09 × 10(-12) cm(3) molecule(-1) s(-1) at 298 K, 2.6 times the value of the rate constant of the unassisted reaction. However, the true effect of water vapor requires taking into account the concentration of the prereactive bimolecular complex, namely, H(2)O(2)·H(2)O. With this consideration, water can actually slow down the oxidation of H(2)O(2) by OH between 1840 and 20.5 times in the 240-425 K temperature range. This is an example that demonstrates how water could be a catalyst in an atmospheric reaction in the laboratory but is slow under atmospheric conditions.
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Affiliation(s)
- Robert J Buszek
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
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28
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Codorniu-Hernández E, Kusalik PG. Insights into the Solvation and Mobility of the Hydroxyl Radical in Aqueous Solution. J Chem Theory Comput 2011; 7:3725-32. [DOI: 10.1021/ct200418e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Edelsys Codorniu-Hernández
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, T2N1N4, Alberta, Canada
| | - Peter G. Kusalik
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, T2N1N4, Alberta, Canada
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29
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Long B, Zhang WJ, Long ZW. Theoretical Study on Impact of Single Water Molecule on OH+O3 Reaction. CHINESE J CHEM PHYS 2011. [DOI: 10.1088/1674-0068/24/04/419-424] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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30
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Liu HT, Müller JP, Beutler M, Ghotbi M, Noack F, Radloff W, Zhavoronkov N, Schulz CP, Hertel IV. Ultrafast photo-excitation dynamics in isolated, neutral water clusters. J Chem Phys 2011; 134:094305. [DOI: 10.1063/1.3556820] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H. T. Liu
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - J. P. Müller
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - M. Beutler
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - M. Ghotbi
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - F. Noack
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - W. Radloff
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - N. Zhavoronkov
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - C. P. Schulz
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
| | - I. V. Hertel
- Max Born Institute, Max-Born-St. 2a, 12489 Berlin-Adlershof, Germany
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31
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Gonzalez J, Anglada JM, Buszek RJ, Francisco JS. Impact of Water on the OH + HOCl Reaction. J Am Chem Soc 2011; 133:3345-53. [DOI: 10.1021/ja100976b] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Javier Gonzalez
- Institut de Quimica Avançada
de Catalunya Departament de Quimica Biologica I Modelitzacio Molecular
IQAC-CSIC, E-08034 Barcelona, Spain
| | - Josep M. Anglada
- Institut de Quimica Avançada
de Catalunya Departament de Quimica Biologica I Modelitzacio Molecular
IQAC-CSIC, E-08034 Barcelona, Spain
| | - Robert J. Buszek
- Department of Chemistry and
Department of Earth and Atmospheric Science, Purdue University, West
Lafayette, Indiana 46907
| | - Joseph S. Francisco
- Department of Chemistry and
Department of Earth and Atmospheric Science, Purdue University, West
Lafayette, Indiana 46907
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32
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Long B, Zhang WJ, Tan XF, Long ZW, Wang YB, Ren DS. Theoretical Study on the Gas Phase Reaction of Sulfuric Acid with Hydroxyl Radical in the Presence of Water. J Phys Chem A 2011; 115:1350-7. [DOI: 10.1021/jp107550w] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Bo Long
- College of Computer and Information Engineering, Guizhou University for Nationalities, Guiyang, China 550025
| | - Wei-jun Zhang
- Laboratory of Environment Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China 230031
| | - Xing-feng Tan
- College of Photo-Electronics, Chongqing University of Posts and Telecommunications, Chongqing, China 400065
| | - Zheng-wen Long
- Department of Physics, Guizhou University, Guiyang, China 550025
| | - Yi-bo Wang
- Key Laboratory of Guizhou High Performance Computational Chemistry, Department of Chemistry, Guizhou University, Guiyang, China 550025
| | - Da-sen Ren
- College of Computer and Information Engineering, Guizhou University for Nationalities, Guiyang, China 550025
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33
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Affiliation(s)
- Daniel M. Chipman
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556-5674, United States
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34
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The reaction between HO and (H2O) n (n = 1, 3) clusters: reaction mechanisms and tunneling effects. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0824-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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35
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Gonzalez J, Anglada JM. Gas Phase Reaction of Nitric Acid with Hydroxyl Radical without and with Water. A Theoretical Investigation. J Phys Chem A 2010; 114:9151-62. [DOI: 10.1021/jp102935d] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Gonzalez
- Departament de Química Biològica i Modelització Molecular, Institut de Química Avançada de Catalunya, IQAC - CSIC, c/Jordi Girona 18, E-08034 Barcelona, Spain
| | - Josep M. Anglada
- Departament de Química Biològica i Modelització Molecular, Institut de Química Avançada de Catalunya, IQAC - CSIC, c/Jordi Girona 18, E-08034 Barcelona, Spain
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36
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Mardyukov A, Crespo-Otero R, Sanchez-Garcia E, Sander W. Photochemistry and Reactivity of the Phenyl Radical-Water System: A Matrix Isolation and Computational Study. Chemistry 2010; 16:8679-89. [DOI: 10.1002/chem.200903362] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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37
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Anglada JM, Gonzalez J. Different Catalytic Effects of a Single Water Molecule: The Gas-Phase Reaction of Formic Acid with Hydroxyl Radical in Water Vapor. Chemphyschem 2009; 10:3034-45. [DOI: 10.1002/cphc.200900387] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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38
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Soloveichik P, O’Donnell BA, Lester MI, Francisco JS, McCoy AB. Infrared Spectrum and Stability of the H2O−HO Complex: Experiment and Theory. J Phys Chem A 2009; 114:1529-38. [DOI: 10.1021/jp907885d] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pesia Soloveichik
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Bridget A. O’Donnell
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Joseph S. Francisco
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
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39
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Martins-Costa M, Anglada JM, Ruiz-López MF. Hyperconjugation in adjacent OO bonds: Remarkable odd/even effects. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.09.090] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Tsuji K, Shibuya K. Infrared Spectroscopy and Quantum Chemical Calculations of OH-(H2O)n Complexes. J Phys Chem A 2009; 113:9945-51. [DOI: 10.1021/jp903648z] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Kazuhide Tsuji
- Gunma National College of Technology, Maebashi 371-8530, Japan, and Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - Kazuhiko Shibuya
- Gunma National College of Technology, Maebashi 371-8530, Japan, and Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8551, Japan
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41
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Mardyukov A, Sanchez‐Garcia E, Crespo‐Otero R, Sander W. Interaction and Reaction of the Phenyl Radical with Water: A Source of OH Radicals. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200806268] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Mardyukov A, Sanchez-Garcia E, Crespo-Otero R, Sander W. Interaction and Reaction of the Phenyl Radical with Water: A Source of OH Radicals. Angew Chem Int Ed Engl 2009; 48:4804-7. [DOI: 10.1002/anie.200806268] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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43
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Garbuio V, Cascella M, Pulci O. Excited state properties of liquid water. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:033101. [PMID: 21817245 DOI: 10.1088/0953-8984/21/3/033101] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, we give an overview of the state of the art in calculations of the electronic band structure and absorption spectra of water. After an introduction to the main theoretical and computational schemes used, we present results for the electronic and optical excitations of water. We focus mainly on liquid water, but spectroscopic properties of ice and vapor phase are also described. The applicability and the accuracy of first-principles methods are discussed, and results are critically presented.
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Affiliation(s)
- Viviana Garbuio
- European Theoretical Spectroscopy Facility (ETSF), CNR-INFM-SMC, Department of Physics University of Rome Tor Vergata, Italy
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44
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Brauer CS, Sedo G, Dahlke E, Wu S, Grumstrup EM, Leopold KR, Marshall MD, Leung HO, Truhlar DG. Effects of O18 isotopic substitution on the rotational spectra and potential splitting in the OH–OH2 complex: Improved measurements for O16H–O16H2 and O18H–O18H2, new measurements for the mixed isotopic forms, and ab initio calculations of the A2′-A2″ energy separation. J Chem Phys 2008; 129:104304. [DOI: 10.1063/1.2973638] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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45
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Du S, Francisco JS, Schenter GK, Garrett BC. Many-body decomposition of the binding energies for OH⋅(H2O)2 and OH⋅(H2O)3 complexes. J Chem Phys 2008; 128:084307. [DOI: 10.1063/1.2828522] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Lapinski L, Gerega A, Sobolewski AL, Nowak MJ. Thioperoxy derivative generated by UV-induced transformation of N-hydroxypyridine-2(1H)-thione isolated in low-temperature matrixes. J Phys Chem A 2007; 112:238-48. [PMID: 18085761 DOI: 10.1021/jp077365r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photochemical transformations of N-hydroxypyridine-2(1H)-thione and its deuterated isotopologue were studied using the matrix-isolation technique. Low-temperature Ar and N2 matrixes containing monomers of this compound were irradiated with continuous-wave near-UV light. Photogeneration of two products was observed in these experiments. The relative population of these photogenerated species was found to be dependent on the wavelength of the UV light used for irradiation. By comparison of the IR spectra of the photoproducts with the spectra simulated theoretically at the DFT(B3LYP)/6-311++G(d, p) level, the final and the intermediate products were identified as rotameric forms of 2-hydroxysulfanyl-pyridine. This is the first report on generation of this thioperoxy derivative of pyridine. The mechanism of photogeneration of 2-hydroxysulfanyl-pyridine involves a photoinduced cleavage of the N-O bond in N-hydroxypyridine-2(1H)-thione, generation of the .OH radical weakly bound with the remaining pyridylthiyl radical, and recombination of these two radicals by formation of the new -S-O- bond. A theoretical model supporting this interpretation was constructed on the basis of approximate coupled cluster (CC2) calculations of the potential energy surfaces of the ground and first excited singlet electronic states of the system. After electronic excitation of the monomeric N-hydroxypyridine-2(1H)-thione, the molecule evolves to the conical intersection with the potential energy surface of the ground state and then to the global minimum corresponding to 2-hydroxysulfanyl-pyridine.
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Affiliation(s)
- Leszek Lapinski
- Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
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47
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Rai D, Joshi H, Kulkarni AD, Gejji SP, Pathak RK. Electric field effects on aromatic and aliphatic hydrocarbons: a density-functional study. J Phys Chem A 2007; 111:9111-21. [PMID: 17722897 DOI: 10.1021/jp074051v] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The influence of a uniform static external electric field on some aliphatic and aromatic molecular species is studied within the density functional theory (DFT) employing the 6-311++G(2d,2p) basis set with B3LYP exchange-correlation prescription. The electric field perturbs the molecular geometry but drastically alters the dipole moments and engenders, to a varying degree, the molecular vibrational Stark effect, i.e., shifts in the infrared (IR) vibrational frequencies accompanied by spectral intensity redistribution. For polar molecules, significant negative ("red") and positive ("blue") frequency shifts are observed for field orientations both parallel and antiparallel to their permanent dipole moments. Further, a selective reordering of frontier orbitals is observed to be brought about by moderately intense fields. In particular, molecules having a lowest unoccupied molecular orbital (LUMO) with predominant pi character possess a threshold field beyond which energy gap between the highest occupied molecular orbital (HOMO) and LUMO diminishes rapidly. A time-dependent (TD) DFT analysis reveals that an increase in the applied field strength by and large increases the excitation energies corresponding to significant electronic transitions among frontier MOs with a concomitant decrease in their oscillator strengths.
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Affiliation(s)
- Dhurba Rai
- Department of Physics, University of Pune, Pune-411007, India
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48
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Chalmet S, Ruiz-López MF. The structures of ozone and HOx radicals in aqueous solution from combined quantum/classical molecular dynamics simulations. J Chem Phys 2007; 124:194502. [PMID: 16729820 DOI: 10.1063/1.2198818] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Ozone in aqueous solution decomposes through a complex mechanism that involves initial reaction with a hydroxide ion followed by formation of a variety of oxidizing species such as HO, HO(2), and HO(3) radicals. Though a number of hydrogen-bonded complexes have been described in the gas phase, both theoretically and experimentally, the structures of ozone and HO(x) in liquid water remain uncertain. In this work, combined quantum/classical computer simulations of aqueous solutions of these species have been reported. The results show that ozone undergoes noticeable electron polarization but it does not participate in hydrogen bonds with liquid water. The main contribution of the solvation energy comes from dispersion forces. In contrast, HO(x) radicals form strong hydrogen bonds. They are better proton donors but weaker proton acceptors than water. Their electronic and geometrical structures are significantly modified by the solvent, especially in the case of HO(3). In all cases, fluctuations in amplitudes of electronic properties are considerable, suggesting that solvent effects might play a crucial role on oxidation mechanisms initiated by ozone in liquid water. These mechanisms are important in a broad range of domains, such as atmospheric processes, plant response to ambient ozone, and medical and industrial applications.
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Affiliation(s)
- Stéphanie Chalmet
- Equipe de Chimie et Biochimie Théoriques, UMR CNRS-UHP No. 7565, Université Henri Poincaré, Nancy I, BP 239, 54506 Vandoeuvre-lès-Nancy Cedex, France
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49
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Marshall MD, Lester MI. Spectroscopic implications of partially quenched orbital angular momentum in the OH-water complex. J Phys Chem B 2007; 109:8400-6. [PMID: 16851986 DOI: 10.1021/jp046308k] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The OH monomer orbital angular momentum is predicted to be partially quenched in the OH-water complex because of the significant splitting of the OH monomer orbital degeneracy into (2)A' and (2)A' ' electronic states. This orbital angular momentum quenching and the associated decoupling of the electron spin from the a inertial axis are shown to have dramatic effects on the rotational band structure of the microwave and infrared transitions of the OH-water complex. At the ab initio values for the splitting between the (2)A' and (2)A' ' surfaces, simulated spectra of a- and b-type bands, such as those expected for the OH radical stretch and water asymmetric stretch, are predicted to have a noticeably different appearance than the well-established limiting cases associated with fully quenched or completely unquenched orbital angular momentum. Spectral identification of the OH-water complex in the gas phase will require explicit consideration of this quenching phenomenon.
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Affiliation(s)
- Mark D Marshall
- Department of Chemistry, Amherst College, P.O. Box 5000, Amherst, Massachusetts 01002-5000, USA
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Kovacic P, Pozos RS. Cell signaling (mechanism and reproductive toxicity): redox chains, radicals, electrons, relays, conduit, electrochemistry, and other medical implications. ACTA ACUST UNITED AC 2007; 78:333-44. [PMID: 17315245 DOI: 10.1002/bdrc.20083] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This article deals with a novel, simple, integrated approach to cell signaling involving basic biochemical principles, and their relationship to reproductive toxicity. Initially, an overview of the biological aspects is presented. According to the hypothetical approach, cell signaling entails interaction of redox chains, involving initiation, propagation, and termination. The messengers are mainly radicals and electrons that are generated during electron transfer (ET) and hydrogen atom abstraction reactions. Termination and initiation processes in the chain occur at relay sites occupied by redox functionalities, including quinones, metal complexes, and imines, as well as redox amino acids. Conduits for the messengers, comprising species with nonbonding electrons, are omnipresent. Details are provided for the various electron transfer processes. In relation to the varying rates of cell communication, rationale is based on electrons and size of radicals. Another fit is similarly seen in inspection of endogenous precursors of reactive oxygen species (ROS); namely, proteins bearing redox moieties, lipid oxidation products, and carbohydrate radicals. A hypothesis is advanced in which electromagnetic fields associated with mobile radicals and electrons play a role. Although radicals have previously been investigated as messengers, the area occupies a minor part of the research, and it has not attracted broad consensus as an important component. For the first time, an integrated framework is presented composed of radicals, electrons, relays, conduits, and electrical fields. The approach is in keeping with the vast majority of experimental observations. Cell signaling also plays an important role in reproductive toxicity. The main classes that cause birth defects, including ROS, radiation, metal compounds, medicinals, abused drugs, and miscellaneous substances, are known to participate in the signaling process. A unifying basis exists, in that both signaling and reproductive toxicity are characterized by the electron transfer-reactive oxygen species-oxidative stress (ET-ROS-OS) scheme. This article also incorporates representative examples of the extensive investigations dealing with various medical implications. There is considerable literature pointing to a role for cell communication in a wide variety of illnesses.
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Affiliation(s)
- Peter Kovacic
- Department of Chemistry, San Diego State University, San Diego, California 92182-1030, USA.
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