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Porto CM, Santana LC, Morgon NH. Theoretical investigation of the cooperative effect of solvent: a case study. Phys Chem Chem Phys 2022; 24:14603-14615. [DOI: 10.1039/d1cp05388d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of solvent was investigated at the DFT level, M06-2X/6-31++G(d,p), for the implicit, namely the universal solvent model based on solute electron density (SMD), and hybrid solvation models, and...
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Zhao ZY, Wang GL, Chen XD, Qi CB, Sun XL. Quantum chemical study of reaction mechanism between plutonium and nitrogen. J Mol Model 2021; 27:363. [PMID: 34825997 DOI: 10.1007/s00894-021-04983-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 11/12/2021] [Indexed: 11/25/2022]
Abstract
The study of the reaction between plutonium and nitrogen is helpful in further understanding the interaction between plutonium and air molecules. Currently, there is no research on the microscopic reaction mechanism of plutonium nitridation reactions. Therefore, the microscopic mechanism of the Pu with N2 gas phase reaction is explored in this study, based on density functional theory (DFT) using different basis functions. In this paper, the geometry of stationary points on the potential energy surface is optimized. In addition, the transition states are verified by frequency analysis and intrinsic reaction coordination (IRC). Finally, we obtained the reaction potential energy curve and micro reaction pathways. Analysis of the reaction mechanism shows that the reaction of Pu with N2 has two pathways. Pathway 1 (Pu + N2 → R1 → TS1 → PuN2) has a T-shaped transition state and pathway 2 (Pu + N2 → R2 → TS2 → PuN + N) has an L-shaped transition state. Both transition states have only one imaginary frequency. According to the comparison of the energy at each stagnation point along the two pathways, and the heat energy emitted by the two reaction paths, we found that pathway 1 is the main reaction pathway. The nature of Pu-N bonding evolution along the pathways was studied by atoms in molecules (AIM) and electron localization function (ELF) topological approaches. In order to analyze the role of the plutonium atom 5f orbital in the reaction, the variation in density state along the pathways was measured. Results show that the 5f orbital mainly contributes to the formation of Pu-N bonds, and the influence of temperature on the reaction rate is revealed by calculating the rate constants of the two reaction pathways.
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Affiliation(s)
- Zhao-Yang Zhao
- Graduate School, Rocket Force University of Engineering, Xian, Shanxi, 710025, People's Republic of China.
| | - Guo-Liang Wang
- Nuclear Science and Technology Laboratory, Rocket Force University of Engineering, Xian, Shanxi, 710025, People's Republic of China
| | - Xu-Dan Chen
- Graduate School, Rocket Force University of Engineering, Xian, Shanxi, 710025, People's Republic of China
| | - Chun-Bao Qi
- Graduate School, Rocket Force University of Engineering, Xian, Shanxi, 710025, People's Republic of China
| | - Xin-Li Sun
- Nuclear Science and Technology Laboratory, Rocket Force University of Engineering, Xian, Shanxi, 710025, People's Republic of China
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He L, Sun X, Zhu F, Ren S, Wang S. OH-initiated transformation and hydrolysis of aspirin in AOPs system: DFT and experimental studies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 592:33-40. [PMID: 28297635 DOI: 10.1016/j.scitotenv.2017.03.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Revised: 02/27/2017] [Accepted: 03/05/2017] [Indexed: 06/06/2023]
Abstract
Advanced oxidation processes (AOPs) are widely used in wastewater treatment of pharmaceutical and personal care products (PPCPs). In this work, the OH-initiated transformation as well as the hydrolysis of a typical PPCPs, aspirin, was investigated using density functional theory (DFT) calculations and laboratory experiments. For DFT calculations, the frontier electron densities and bond dissociation energies were analyzed. Profiles of the potential energy surface were constructed, and all the possible pathways were discussed. Additionally, rate constants for each pathway were calculated with transition state theory (TST) method. UV/H2O2 experiments of aspirin were performed and degradation intermediates were identified by UPLC-MS-MS analysis. Different findings from previous experimental works were reported that the H-abstraction pathways at methyl position were dominated and OH-addition pathways on benzene ring were also favored. Meantime, hydroxyl ASA was confirmed as the main stable intermediate. Moreover, it was the first time to use DFT method to investigate the hydrolysis mechanisms of organic ester compound.
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Affiliation(s)
- Lin He
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Xiaomin Sun
- Environment Research Institute, Shandong University, Jinan 250100, PR China.
| | - Fanping Zhu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Shaojie Ren
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Shuguang Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
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Bai FY, Lv S, Ma Y, Liu CY, He CF, Pan XM. Understanding the insight into the mechanisms and dynamics of the Cl-initiated oxidation of (CH 3) 3CC(O)X and the subsequent reactions in the presence of NO and O 2 (X = F, Cl, and Br). CHEMOSPHERE 2017; 171:49-56. [PMID: 28002766 DOI: 10.1016/j.chemosphere.2016.12.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 12/07/2016] [Accepted: 12/08/2016] [Indexed: 06/06/2023]
Abstract
In this work, the density functional and high-level ab initio theories are adopted to investigate the mechanisms and kinetics of reaction of (CH3)3CC(O)X (X = F, Cl, and Br) with atomic chlorine. Rate coefficients for the reactions of chlorine atom with (CH3)3CC(O)F (k1), (CH3)3CC(O)Cl (k2), and (CH3)3CC(O)Br (k3) are calculated using canonical variational transition state theory coupled with small curvature tunneling method over a wide range of temperatures from 250 to 1000 K. The dynamic calculations are performed by the variational transition state theory with the interpolated single-point energies method at the CCSD(T)/aug-cc-pVDZ//B3LYP/6-311++G(d,p) level of theory. Computed rate constant is in good line with the available experimental value. The rate constants for the title reactions are in this order: k1<k2<k3, suggesting that the effect of halogen substitution on the mechanisms and dynamics is different. The subsequent and secondary reactions for the hydrogen abstraction intermediates are studied involving NO and O2 molecules in the atmosphere. The atmospheric lifetime and global warming potential (GWP) of (CH3)3CC(O)X (X = F, Cl, and Br) are estimated, and it shows that (CH3)3CC(O)F have larger GWP value than that of (CH3)3CC(O)Cl and (CH3)3CC(O)Br. Due to the presence of Cl and Br atoms, the environmental impact of (CH3)3CC(O)Cl and (CH3)3CC(O)Br may be given more concerns.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Shuang Lv
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Yuan Ma
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Chun-Yu Liu
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Chun-Fang He
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China.
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5
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Mechanistic aspects of the activation of C–H bond in C2H6 by Th atom: bonding analysis and reaction coefficients. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-2015-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Guan Y, Li Y, Zhao L, Song Y, Ma H, Song J. Hydrogen transfer between dimethyl ether and the methoxy radical: Understanding and kinetic modeling with anharmonic torsions. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.05.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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TIWARI MANISHK, MISHRA PC. Anti-oxidant activity of 6-gingerol as a hydroxyl radical scavenger by hydrogen atom transfer, radical addition and electron transfer mechanisms. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1128-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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8
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Tiwari MK, Mishra PC. Catalytic role of iron-superoxide dismutase in hydrogen abstraction by super oxide radical anion from ascorbic acid. RSC Adv 2016. [DOI: 10.1039/c6ra11455e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The catalytic role of iron-superoxide dismutase (Fe-SOD) in the working of ascorbic acid (AA) as a superoxide radical anion scavenger has been studied by employing a model developed recently for the active site of the enzyme.
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Affiliation(s)
- Manish K. Tiwari
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi – 221 005
- India
| | - Phool C. Mishra
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi – 221 005
- India
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Chow R, Mok DKW, Lee EPF, Dyke JM. A theoretical study of the atmospherically important radical–radical reaction BrO + HO2; the product channel O2(a1Δg) + HOBr is formed with the highest rate. Phys Chem Chem Phys 2016; 18:30554-30569. [DOI: 10.1039/c6cp05877a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A theoretical study has been made of the BrO + HO2 reaction, a radical–radical reaction which contributes to ozone depletion in the atmosphere via production of HOBr.
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Affiliation(s)
- Ronald Chow
- Department of Applied Biology and Chemical Technology
- Hong Kong Polytechnic University
- Hung Hom
- China
| | - Daniel K. W. Mok
- Department of Applied Biology and Chemical Technology
- Hong Kong Polytechnic University
- Hung Hom
- China
| | - Edmond P. F. Lee
- Department of Applied Biology and Chemical Technology
- Hong Kong Polytechnic University
- Hung Hom
- China
- School of Chemistry
| | - John M. Dyke
- School of Chemistry
- University of Southampton
- Southampton SO17 1BJ
- UK
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10
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Ng M, Mok DK, Lee EP, Dyke JM. A theoretical investigation of the atmospherically important reaction between chlorine atoms and formic acid: determination of the reaction mechanism and calculation of the rate coefficient at different temperatures. Mol Phys 2015. [DOI: 10.1080/00268976.2014.980448] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Maggie Ng
- Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Daniel K.W. Mok
- Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Edmond P.F. Lee
- Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
- School of Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton, UK
| | - John M. Dyke
- School of Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton, UK
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11
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Li P, Niu W, Gao T, Wang H. Water OH Bond Activation by Gas-Phase Plutonium Atoms: Reaction Mechanisms and Ab Initio Molecular Dynamics Study. Chemphyschem 2014; 15:3078-88. [DOI: 10.1002/cphc.201402327] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 11/09/2022]
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12
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Kinetics, mechanism and thermochemistry of the gas phase reactions of CF3CH2OCH2CF3 with OH radicals: A theoretical study. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.02.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Chow R, Ng M, Mok DKW, Lee EPF, Dyke JM. Rate Coefficients of the Cl + CH3C(O)OCH3 → HCl + CH3C(O)OCH2 Reaction at Different Temperatures Calculated by Transition-State Theory with ab Initio and Density Functional Theory Reaction Paths. J Phys Chem A 2014; 118:2040-55. [PMID: 24533502 DOI: 10.1021/jp5000864] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ronald Chow
- Department
of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Maggie Ng
- Department
of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Daniel K. W. Mok
- Department
of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Edmond P. F. Lee
- Department
of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Hong Kong
- School
of Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - John M. Dyke
- School
of Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
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14
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Viegas LP, Varandas AJC. Coupled‐cluster reaction barriers of : An application of the coupled‐cluster//Kohn–Sham density functional theory model chemistry. J Comput Chem 2013; 35:507-17. [DOI: 10.1002/jcc.23458] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 09/06/2013] [Accepted: 09/12/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Luís P. Viegas
- Departamento de QuímicaUniversidade de Coimbra3004‐535Coimbra Portugal
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