1
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Li C, Chin CH, Zhu T, Hui Zhang JZ. An ab initio/RRKM study of the reaction mechanism and product branching ratios of CH3OH+ and CH3OH++ dissociation. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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2
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Carstensen HH, Wagner HG. Investigations of the Reactions of1CH2(ã1A1(v= 0,1)) with H2O, D2O and HCl. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.199500121] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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3
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Thapa B, Schlegel HB. Molecular Dynamics of Methanol Monocation (CH3OH+) in Strong Laser Fields. J Phys Chem A 2014; 118:1769-76. [DOI: 10.1021/jp410091b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bishnu Thapa
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - H. Bernhard Schlegel
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
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4
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Jaufeerally NB, Abdallah HH, Ramasami P, Schaefer HF. Journey through the Potential Energy Surfaces for the Isomerization and Decomposition Reactions of the Telluroformaldehyde Analogues: H2A═Te and HFA═Te (A = C, Si, and Ge). J Phys Chem A 2013; 117:5567-77. [DOI: 10.1021/jp403341z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Naziah B. Jaufeerally
- Computational Chemistry Group,
Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius
| | - Hassan H. Abdallah
- School Department of Chemistry,
Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor, Malaysia
| | - Ponnadurai Ramasami
- Computational Chemistry Group,
Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius
| | - Henry F. Schaefer
- Center for Computational Quantum
Chemistry, University of Georgia, Athens,
Georgia 30602, United States
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5
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Jissy AK, Meena SK, Datta A. Reactivity of germanones: far removed from ketones – a computational study. RSC Adv 2013. [DOI: 10.1039/c3ra44352c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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6
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A direct investigation of the reaction CH3+OH: Overall rate constant and CH2 formation at T=298 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19981020108] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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7
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Kiselev VG, Swinnen S, Nguyen VS, Gritsan NP, Nguyen MT. Fast reactions of hydroxycarbenes: tunneling effect versus bimolecular processes. J Phys Chem A 2010; 114:5573-9. [PMID: 20380373 DOI: 10.1021/jp911655a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Different uni- and bimolecular reactions of hydroxymethylene, an important intermediate in the photochemistry of formaldehyde, as well as its halogenated derivatives (XCOH, X = H, F, Cl, Br), have been considered using high-level CCSD(T)/CBS quantum chemical methods. The Wentzel-Kramers-Brillouin (WKB) and Eckart approximations were applied to estimate the tunneling rate constant of isomerization of trans-HCOH to H(2)CO, and the WKB procedure was found to perform better in this case. In agreement with recent calculations and experimental observations [Schreiner et al., Nature 2008, 453, 906], the half-life of HCOH at the low temperature limit in the absence of bimolecular processes was found to be very long (approximately 2.1 h). The corresponding half-life at room temperature was also noticeable (approximately 35 min). Bimolecular reactions of trans-hydroxymethylene with parent formaldehyde yield primarily more thermodynamically favorable glycolaldehyde via the specific mechanism involving 5-center transition state. The most preferable reaction of cis-hydroxymethylene with formaldehyde yields carbon monoxide and methanol. Due to very low activation barriers, both processes occur with nearly a collision rate. If the concentration of HCOH (and its halogenated analogues XCOH as well) is high enough, the bimolecular reactions of this species with itself become important, and H(2)CO (or X(H)CO) is then formed with a collision rate. The singlet-triplet energy separation of trans-HCOH is confirmed to be approximately -25 kcal/mol.
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Affiliation(s)
- Vitaly G Kiselev
- Department of Chemistry, and Mathematical Modeling and Computational Science Center (LMCC), University of Leuven, B-3001 Leuven, Belgium.
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8
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9
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Guan X, Lin X, Kwok WM, Du Y, Li YL, Zhao C, Wang D, Phillips DL. Ultraviolet photolysis of CH2I2 in methanol: O-H insertion and HI elimination reactions to form a dimethoxymethane product. J Phys Chem A 2007; 109:1247-56. [PMID: 16833436 DOI: 10.1021/jp046060z] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ultraviolet photolysis of low concentrations of CH2I2 in methanol solution found that CH2I2 is converted into dimethoxymethane and some H+ and I- products. Picosecond time-resolved resonance Raman (ps-TR3) experiments observed that the isodiiodomethane (CH2I-I) photoproduct decayed faster as the concentration of methanol increases, suggesting that isodiiodomethane is reacting with methanol. Ab initio calculations indicate isodiiodomethane is able to react with methanol via an O-H insertion/HI elimination to form an iodoether (ICH2-O-CH3) and HI products. The iodoether can then further react via another O-H insertion/HI elimination reaction to form the dimethoxymethane (CH3-O-CH2-O-CH3) observed in the photochemistry experiments. A reaction mechanism consistent with these experimental and theoretical observations is proposed.
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Affiliation(s)
- Xiangguo Guan
- Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong, PRC
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10
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Harding LB, Klippenstein SJ, Jasper AW. Ab initio methods for reactive potential surfaces. Phys Chem Chem Phys 2007; 9:4055-70. [PMID: 17687458 DOI: 10.1039/b705390h] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Case studies of ten reactions using a variety of standard electronic structure methods are presented. These case studies are used to illustrate the usefulness and shortcomings of these standard methods for various classes of reactions. Limited comparisons with experiment are made. The reactions studied include four radical-radical combinations, H + CH(3)--> CH(4), CH(3) + CH(3)--> C(2)H(6), H + HCO --> H(2)CO and CH(3) + HCO --> CH(3)CHO, three abstraction reactions, H + HO(2)--> H(2) + O(2), H + HCO --> H(2) + CO and CH(3) + HCO --> CH(4) + CO, a radical-molecule addition, H + HCCH --> C(2)H(3), and two molecular decompositions, H(2)CO --> H(2) + CO and CH(3)CHO --> CH(4) + CO. The electronic structure methods used are DFT, MP2, CCSD(T), QCISD(T), CASSCF, CASPT2, and CAS+1+2+QC.
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Affiliation(s)
- Lawrence B Harding
- Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, USA.
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11
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Bernardi F, Robb MA. Transition Structure Computations and their Analysis. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470142936.ch3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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12
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Han QZ, Zhao YH, Wen H. Estimation of Solvent Effects for the Complexing Reaction of Propylene and Nickel Dithiolene. DATA SCIENCE JOURNAL 2007. [DOI: 10.2481/dsj.6.s837] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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13
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Han Y, Wang JG, Cheng DG, Liu CJ. Density Functional Theory Study of Methanol Conversion via Cold Plasmas. Ind Eng Chem Res 2006. [DOI: 10.1021/ie060132m] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- You Han
- Key Laboratory of Green Chemical Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, People's Republic of China
| | - Jian-guo Wang
- Key Laboratory of Green Chemical Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, People's Republic of China
| | - Dang-guo Cheng
- Key Laboratory of Green Chemical Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, People's Republic of China
| | - Chang-jun Liu
- Key Laboratory of Green Chemical Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, People's Republic of China
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14
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Yang X, Zhang W, Ji M, Chen Y, Chen C. Time-resolved kinetic studies on quenching of HCF(A1A'') by alkane and alcohol molecules. J Phys Chem A 2005; 109:4989-94. [PMID: 16833849 DOI: 10.1021/jp050402z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
HCF(X1A') radicals were produced by laser photolysis of CHFBr2 at 213 nm and were electronically excited from the ground state to A1A''(030) at 492.7 nm with a dye laser pumped by a Nd:YAG laser. With the analysis of the lifetime of the time-resolved total fluorescence signals collected in the reaction cell where the total pressure was fixed to be 14.0 Torr, the quenching data of HCF(A1A'') by alkane and alcohol molecules at room temperature were derived from variation of pseudo-first-order rate constant with different quencher pressures. It is found that the quenching rate constants are close to the collision rate constants (10(-10) cm3 molecule(-1) s(-1)), indicating the long-range attractive forces between the collision partners play an important role in the entrance channel of quenching process. Several kinetic models were applied to analyze the mechanism of the quenching process. The complex formation cross sections are calculated with the collision complex model. Correlations of the quenching rate constant for the removal of the HCF(A1A'') state with ionization potential of the quenching partners show that the insertion reactive mechanism is probably the dominant reaction channel, which is analogous to the behaviors of other three-atom carbenes in corresponding electronic states.
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Affiliation(s)
- Xueliang Yang
- Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026
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15
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Du Y, Guan X, Kwok WM, Chu LM, Phillips DL. Comparison of the Dehalogenation of Dihalomethanes (CH2XI, where X = Cl, Br, I) Following Ultraviolet Photolysis in Aqueous and NaCl Saltwater Environments. J Phys Chem A 2005; 109:5872-82. [PMID: 16833922 DOI: 10.1021/jp0504928] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ultraviolet photolysis of low concentrations of CH(2)XI (X = Cl, Br, I) were investigated in water and saltwater solutions by photochemistry and picosecond time-resolved resonance Raman spectroscopy. Photolysis in both kinds of solutions formed mostly CH(2)(OH)(2) and HI and HX products. However, photolysis of the CH(2)XI molecules in saltwater resulted in production of some CH(2)XCl products not observed in aqueous solutions without salt present. The appearance of these new products in saltwater solutions is accompanied by a decrease in the amount of CH(2)(OH)(2), HI, and HX products compared to photolysis in aqueous solutions without salt present. The possible implications for photolysis of CH(2)XI and other polyhalomethanes in seawater and other salt aqueous environments compared to nonsaltwater solvated environments is briefly discussed.
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Affiliation(s)
- Yong Du
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., P.R. China
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16
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Photochemistry of bis(1,1,1,5,5,5-hexafluoro-2,4-pentanedionato)strontium tetraglyme solutions for eventual liquid phase photochemical deposition. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2004.12.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Lin X, Guan X, Kwok WM, Zhao C, Du Y, Li YL, Phillips DL. Water-Catalyzed O−H Insertion/HI Elimination Reactions of Isodihalomethanes (CH2X−I, Where X = Cl, Br, I) with Water and the Dehalogenation of Dihalomethanes in Water-Solvated Environments. J Phys Chem A 2005; 109:981-98. [PMID: 16833405 DOI: 10.1021/jp0450843] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A combined experimental and theoretical investigation of the ultraviolet photolysis of CH2XI (where X = Cl, Br, I) dihalomethanes in water is presented. Ultraviolet photolysis of low concentrations of CH2XI (where X = Cl, Br, I) in water appears to lead to almost complete conversion into CH2(OH)2 and HX and HI products. Picosecond time-resolved resonance Raman (ps-TR3) spectroscopy experiments revealed that noticeable amounts of CH2X-I isodihalomethane intermediates were formed within several picoseconds after photolysis of the CH2XI parent compound in mixed aqueous solutions. The ps-TR3 experiments in mixed aqueous solutions revealed that the decay of the CH2X-I isodihalomethane intermediates become significantly shorter as the water concentration increases, indicating that the CH2X-I intermediates may be reacting with water. Ab initio calculations found that the CH2X-I intermediates are able to react relatively easily with water via a water-catalyzed O-H insertion/HI elimination reaction to produce CH2X(OH) and HI products, with the barrier for these reactions increasing as X changes from Cl to Br to I. The ab initio calculations also found that the CH2X(OH) product can undergo a water-catalyzed HX elimination reaction to make H2C=O and HX products, with the barrier to reaction decreasing as X changes from Cl to Br to I. The preceding two water-catalyzed reactions produce the HI and HX leaving groups observed experimentally, and the H2C=O product further reacts with water to make the other CH2(OH)2 product observed in the photochemistry experiments. This suggests that that the CH2X-I intermediates react with water to form the CH2(OH)2 and HI and HX products observed in the photochemistry experiments. Ultraviolet photolysis of CH2XI (where X = Cl, Br, I) at low concentrations in water-solvated environments appears to lead to efficient dehalogenation and release of two strong acid leaving groups. We very briefly discuss the potential influence of this photochemistry in water on the decomposition of polyhalomethanes and halomethanols in aqueous environments.
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Affiliation(s)
- Xufeng Lin
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., P. R. China
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18
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Norris KE, Bacskay GB, Gready JE. Theoretical study of “protonated pyruvate”: A methylhydroxycarbene-carbon dioxide complex-implications for the decarboxylation of pyruvic acid. J Comput Chem 2004. [DOI: 10.1002/jcc.540140611] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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19
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Yu HG, Muckerman JT. MRCI Calculations of the Lowest Potential Energy Surface for CH3OH and Direct ab Initio Dynamics Simulations of the O(1D) + CH4 Reaction. J Phys Chem A 2004. [DOI: 10.1021/jp049642p] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hua-Gen Yu
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973-5000
| | - James T. Muckerman
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973-5000
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20
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Feng L, Reisler H. Photodissociation of the Hydroxymethyl Radical from the 22A‘ ‘(3pz) State: H2CO and HCOH Products. J Phys Chem A 2004. [DOI: 10.1021/jp0479769] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lin Feng
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
| | - Hanna Reisler
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
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21
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Kwok WM, Zhao C, Guan X, Li YL, Du Y, Phillips DL. Efficient dehalogenation of polyhalomethanes and production of strong acids in aqueous environments: Water-catalyzed O–H-insertion and HI-elimination reactions of isodiiodomethane (CH2I–I) with water. J Chem Phys 2004; 120:9017-32. [PMID: 15267837 DOI: 10.1063/1.1701699] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A combined experimental and theoretical study of the ultraviolet photolysis of CH2I2 in water is reported. Ultraviolet photolysis of low concentrations of CH2I2 in water was experimentally observed to lead to almost complete conversion into CH2(OH)2 and 2HI products. Picosecond time-resolved resonance Raman spectroscopy experiments in mixed water/acetonitrile solvents (25%-75% water) showed that appreciable amounts of isodiiodomethane (CH2I-I) were formed within several picoseconds and the decay of the CH2I-I species became substantially shorter with increasing water concentration, suggesting that CH2I-I may be reacting with water. Ab initio calculations demonstrate the CH2I-I species is able to react readily with water via a water-catalyzed O--H-insertion and HI-elimination reaction followed by its CH2I(OH) product undergoing a further water-catalyzed HI-elimination reaction to make a H2C=O product. These HI-elimination reactions produce the two HI leaving groups observed experimentally and the H2C=O product further reacts with water to produce the other final CH2(OH)2 product observed in the photochemistry experiments. These results suggest that CH2I-I is the species that reacts with water to produce the CH2(OH)2 and 2HI products seen in the photochemistry experiments. The present study demonstrates that ultraviolet photolysis of CH2I2 at low concentration leads to efficient dehalogenation and release of multiple strong acid (HI) leaving groups. Some possible ramifications for the decomposition of polyhalomethanes and halomethanols in aqueous environments as well as the photochemistry of polyhalomethanes in the natural environment are briefly discussed.
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Affiliation(s)
- Wai Ming Kwok
- Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong, China
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22
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Kwok WM, Zhao C, Li YL, Guan X, Wang D, Phillips DL. Water-Catalyzed Dehalogenation Reactions of Isobromoform and Its Reaction Products. J Am Chem Soc 2004; 126:3119-31. [PMID: 15012142 DOI: 10.1021/ja0390552] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A combined experimental and theoretical study of the photochemistry of CHBr(3) in pure water and in acetonitrile/water mixed solvents is reported that elucidates the reactions and mechanisms responsible for the photochemical conversion of the halogen atoms in CHBr(3) into three bromide ions in water solution. Ultraviolet excitation at 240 nm of CHBr(3) (9 x 10(-)(5) M) in water resulted in almost complete conversion into 3HBr leaving groups and CO (major product) and HCOOH (minor product) molecules. Picosecond time-resolved resonance Raman (ps-TR(3)) experiments and ab initio calculations indicate that the water-catalyzed O-H insertion/HBr elimination reaction of isobromoform and subsequent reactions of its products are responsible for the production of the final products observed following ultraviolet excitation of CHBr(3) in water. These results have important implications for the phase-dependent behavior of polyhalomethane photochemistry and chemistry in water-solvated environments as compared to gas-phase reactions. The dissociation reaction of HBr into H(+) and Br(-) ions is the driving force for several O-H insertion and HBr elimination reactions and allows O-H and C-H bonds to be cleaved more easily than in the absence of water molecules. This water-catalysis by solvation of a leaving group and its dissociation into ions (e.g., H(+) and Br(-) in the examples investigated here) may occur for a wide range of chemical reactions taking place in water-solvated environments.
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Affiliation(s)
- Wai Ming Kwok
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., P. R. China
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Kwok WM, Zhao C, Li YL, Guan X, Phillips DL. Direct observation of an isopolyhalomethane O–H insertion reaction with water: Picosecond time-resolved resonance Raman (ps-TR3) study of the isobromoform reaction with water to produce a CHBr2OH product. J Chem Phys 2004; 120:3323-32. [PMID: 15268486 DOI: 10.1063/1.1640997] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Picosecond time-resolved resonance Raman (ps-TR3) spectroscopy was used to obtain the first definitive spectroscopic observation of an isopolyhalomethane O-H insertion reaction with water. The ps-TR3 spectra show that isobromoform is produced within several picoseconds after photolysis of CHBr3 and then reacts on the hundreds of picosecond time scale with water to produce a CHBr2OH reaction product. Photolysis of low concentrations of bromoform in aqueous solution resulted in noticeable formation of HBr strong acid. Ab initio calculations show that isobromoform can react with water to produce a CHBr2(OH) O-H insertion reaction product and a HBr leaving group. This is consistent with both the ps-TR3 experiments that observe the reaction of isobromoform with water to form a CHBr2(OH) product and photolysis experiments that show HBr acid formation. We briefly discuss the implications of these results for the phase dependent behavior of polyhalomethane photochemistry in the gas phase versus water solvated environments.
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Affiliation(s)
- Wai Ming Kwok
- Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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Guan X, Du Y, Li YL, Kwok WM, Phillips DL. Comparison of the dehalogenation of polyhalomethanes and production of strong acids in aqueous and salt (NaCl) water environments: Ultraviolet photolysis of CH[sub 2]I[sub 2]. J Chem Phys 2004; 121:8399-409. [PMID: 15511161 DOI: 10.1063/1.1803508] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The ultraviolet photolysis of CH(2)I(2) was studied in water and salt water solutions using photochemistry and picosecond time-resolved resonance Raman spectroscopy. Photolysis in both types of environments produces mainly CH(2)(OH)(2) and HI products. However, photolysis of CH(2)I(2) in salt water leads to the formation of different products/intermediates (CH(2)ICl and Cl(2) (-)) not observed in the absence of salt in aqueous solutions. The amount of CH(2)(OH)(2) and HI products appears to decrease after photolysis of CH(2)I(2) in salt water compared to pure water. We briefly discuss possible implications of these results for photolysis of CH(2)I(2) and other polyhalomethanes in sea water and other salt aqueous environments compared to nonsalt water solvated environments.
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Affiliation(s)
- Xiangguo Guan
- Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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25
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Li YL, Zhao C, Kwok WM, Guan X, Zuo P, Phillips DL. Observation of a HI leaving group following ultraviolet photolysis of CH2I2 in water and anab initioinvestigation of the O–H insertion/HI elimination reactions of the CH2I–I isopolyhalomethane species with H2O and 2H2O. J Chem Phys 2003. [DOI: 10.1063/1.1595636] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Kwok WM, Ma C, Parker AW, Phillips D, Towrie M, Matousek P, Phillips DL. Picosecond Time-Resolved Resonance Raman Study of CH2I−I Produced after Ultraviolet Photolysis of CH2I2 in CH3OH, CH3CN/H2O and CH3OH/H2O Solutions. J Phys Chem A 2003. [DOI: 10.1021/jp021611b] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Wai Ming Kwok
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - Chensheng Ma
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - Anthony W. Parker
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - David Phillips
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - Michael Towrie
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - Pavel Matousek
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
| | - David Lee Phillips
- Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, U.K., Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K., and Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong S. A. R., P. R. China
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Schlegel HB, Iyengar SS, Li X, Millam JM, Voth GA, Scuseria GE, Frisch MJ. Ab initio molecular dynamics: Propagating the density matrix with Gaussian orbitals. III. Comparison with Born–Oppenheimer dynamics. J Chem Phys 2002. [DOI: 10.1063/1.1514582] [Citation(s) in RCA: 365] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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28
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Kurosaki Y, Yokoyama K. Photodissociation of Acetaldehyde, CH3CHO → CH4 + CO: Direct ab Initio Dynamics Study. J Phys Chem A 2002. [DOI: 10.1021/jp020998f] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yuzuru Kurosaki
- Advanced Photon Research Center, Japan Atomic Energy Research Institute, Umemidai, Kizu-cho, Soraku-gun, Kyoto 619-0215, Japan
| | - Keiichi Yokoyama
- Advanced Photon Research Center, Japan Atomic Energy Research Institute, Umemidai, Kizu-cho, Soraku-gun, Kyoto 619-0215, Japan
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29
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Anand S, Schlegel HB. Unimolecular Dissociation of Formyl Halides HXCO → CO + HX (X= F, Cl): An Ab Initio Direct Classical Trajectory Study. J Phys Chem A 2002. [DOI: 10.1021/jp021495c] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Smriti Anand
- Department of Chemistry and Institute of Scientific Computing, Wayne State University, Detroit, Michigan 48202
| | - H. Bernhard Schlegel
- Department of Chemistry and Institute of Scientific Computing, Wayne State University, Detroit, Michigan 48202
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30
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Liu JJ, Feng JK, Chen H, Ding YH, Sun CC. Theoretical Study on the Mechanism of the 1CHCl + N2O Reaction. J Phys Chem A 2002. [DOI: 10.1021/jp020623u] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jian-jun Liu
- State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun, Jilin 130023, Peoples' Republic of China
| | - Ji-kang Feng
- State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun, Jilin 130023, Peoples' Republic of China
| | - Hong Chen
- State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun, Jilin 130023, Peoples' Republic of China
| | - Yi-hong Ding
- State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun, Jilin 130023, Peoples' Republic of China
| | - Chia-chung Sun
- State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun, Jilin 130023, Peoples' Republic of China
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31
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Dallos M, Lischka H, Ventura Do Monte E, Hirsch M, Quapp W. Determination of energy minima and saddle points using multireference configuration interaction methods in combination with reduced gradient following: the S(0) surface of H(2)CO and the T(1) and T(2) surfaces of acetylene. J Comput Chem 2002; 23:576-83. [PMID: 11948584 DOI: 10.1002/jcc.10054] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The implementation of the reduced gradient following (RGF) method into the COLUMBUS quantum-chemical program system is reported using the newly developed analytic MR-CISD/AQCC gradient feature. By this combination a very useful tool has been developed for general searches of stationary points on ground- and excited-state energy surfaces. This procedure is applied to the S(0) surface of H(2)CO and the T(1) and T(2) surfaces of acetylene. For H(2)CO we investigated three minima (formaldehyde, s-trans, and s-cis hydroxycarbene) and five saddle points. For the T(1) and T(2) states of acetylene the cis- and trans-minima and the planar and nonplanar saddle points were computed.
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Affiliation(s)
- Michal Dallos
- Institute for Theoretical Chemistry and Structural Biology, University of Vienna, Währingerstrasse 17, A-1090 Vienna, Austria
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32
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33
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Drougas E, Papayannis D, Kosmas A. Quantum mechanical and RRKM studies of the reactions CH3+ClO→CH3O+Cl and CH3O+Cl→HCHO+HCl. Chem Phys 2002. [DOI: 10.1016/s0301-0104(01)00548-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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34
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Sakaki S, Takayama T, Sugimoto M. Platinum(II) Hydride Silanone Complexes and Cyclic Trimers of Silanone. A Theoretical Study of Their Geometries, Bonding Nature, and Stabilities. Organometallics 2001. [DOI: 10.1021/om010499l] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shigeyoshi Sakaki
- Institute for Fundamental Research of Organic Chemistry, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 820-8581, Japan, and Graduate School of Science and Technology, Kurokami, Kumamoto 860-8555, Japan
| | - Tatsunori Takayama
- Institute for Fundamental Research of Organic Chemistry, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 820-8581, Japan, and Graduate School of Science and Technology, Kurokami, Kumamoto 860-8555, Japan
| | - Manabu Sugimoto
- Institute for Fundamental Research of Organic Chemistry, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 820-8581, Japan, and Graduate School of Science and Technology, Kurokami, Kumamoto 860-8555, Japan
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35
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Koch DM, Khieu NH, Peslherbe GH. Ab Initio Studies of the Glyoxal Unimolecular Dissociation Pathways. J Phys Chem A 2001. [DOI: 10.1021/jp0039013] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Denise M. Koch
- Centre for Research in Molecular Modeling, and Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada H3G 1M8
| | - Nam Huan Khieu
- Centre for Research in Molecular Modeling, and Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada H3G 1M8
| | - Gilles H. Peslherbe
- Centre for Research in Molecular Modeling, and Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada H3G 1M8
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36
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Li X, Millam JM, Schlegel HB. Ab initio molecular dynamics studies of the photodissociation of formaldehyde, H2CO→H2+CO: Direct classical trajectory calculations by MP2 and density functional theory. J Chem Phys 2000. [DOI: 10.1063/1.1323503] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Feller D, Dupuis M, Garrett BC. Barrier for the H2CO→H2+CO reaction: A discrepancy between high-level electronic structure calculations and experiment. J Chem Phys 2000. [DOI: 10.1063/1.481788] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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38
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Reid DL, Hernández-Trujillo J, Warkentin J. A Theoretical Study of Hydroxycarbene as a Model for the Homolysis of Oxy- and Dioxycarbenes. J Phys Chem A 2000. [DOI: 10.1021/jp9941965] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Darren L. Reid
- Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
| | | | - John Warkentin
- Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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39
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Merelas I, Fernández J, Puyuelo P, Sánchez Rayo M, Husain D, Castaño F. The collisional removal of the carbene CCl2(X̃(0,0,0)) and CCl2((0,7,0)) by rare gases and simple molecules. Chem Phys 2000. [DOI: 10.1016/s0301-0104(00)00017-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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41
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42
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Brownsword RA, Hillenkamp M, Schmiechen P, Volpp HR, Upadhyaya HP. Absolute Reactive Cross Section for H Atom Formation in the Reaction of Translationally Energetic O(1D) Atoms with Methane. J Phys Chem A 1998. [DOI: 10.1021/jp980652y] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard A. Brownsword
- Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
| | - Matthias Hillenkamp
- Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
| | - Patricia Schmiechen
- Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
| | - Hans-Robert Volpp
- Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
| | - Hari P. Upadhyaya
- Chemistry Division, Bhabha Atomic Research Centre, Bombay 400 085, India
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43
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Density functional calculations exploring the methylene-water interaction in the gas phase and in solution. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0166-1280(97)00299-6] [Citation(s) in RCA: 11] [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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44
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Nowek A, Sims R, Babinec P, Leszczynski J. Comparative ab Initio Study of Molecular Structures and Relative Stabilities of Germanone, Germathione, Germaselenone, and Their Structural Isomers. J Phys Chem A 1998. [DOI: 10.1021/jp972532g] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrzej Nowek
- Department of Chemistry, Jackson State University, P.O. Box 17910, Jackson, Mississippi 39217, and Department of Chemical Physics, Comenius University, Bratislava, Slovakia
| | - Rashad Sims
- Department of Chemistry, Jackson State University, P.O. Box 17910, Jackson, Mississippi 39217, and Department of Chemical Physics, Comenius University, Bratislava, Slovakia
| | - Peter Babinec
- Department of Chemistry, Jackson State University, P.O. Box 17910, Jackson, Mississippi 39217, and Department of Chemical Physics, Comenius University, Bratislava, Slovakia
| | - Jerzy Leszczynski
- Department of Chemistry, Jackson State University, P.O. Box 17910, Jackson, Mississippi 39217, and Department of Chemical Physics, Comenius University, Bratislava, Slovakia
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45
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Wilson C, Balint-Kurti GG. New Pathway for the CH3 + OH → CH2 + H2O Reaction on a Triplet Surface. J Phys Chem A 1998. [DOI: 10.1021/jp973026u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Craig Wilson
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
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46
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Kurosaki Y, Takayanagi T, Sato K, Tsunashima S. Ab Initio Molecular Orbital Calculations of the Potential Energy Surfaces for the N(2D) + CH4 Reaction. J Phys Chem A 1998. [DOI: 10.1021/jp972565w] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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De Avillez Pereira R, Baulch DL, Pilling MJ, Robertson SH, Zeng G. Temperature and Pressure Dependence of the Multichannel Rate Coefficients for the CH3+ OH System. J Phys Chem A 1997. [DOI: 10.1021/jp972140+] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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48
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Poutsma JC, Paulino JA, Squires RR. Absolute Heats of Formation of CHCl, CHF, and CClF. A Gas-Phase Experimental and G2 Theoretical Study. J Phys Chem A 1997. [DOI: 10.1021/jp970778f] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John C. Poutsma
- The Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Jose A. Paulino
- The Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Robert R. Squires
- The Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
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49
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Poutsma JC, Nash JJ, Paulino JA, Squires RR. Absolute Heats of Formation of Phenylcarbene and Vinylcarbene. J Am Chem Soc 1997. [DOI: 10.1021/ja963918s] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- John C. Poutsma
- Contribution from the Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - John J. Nash
- Contribution from the Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Jose A. Paulino
- Contribution from the Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Robert R. Squires
- Contribution from the Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
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50
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The hydrogen-bridged radical cation [H2O⋯H⋯OCOH·+: A combined experimental and theoretical study of its stability and dissociation chemistry. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0168-1176(96)04496-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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