1
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Zhao H, Pan Y, Lau KC. Ferrocene/ferrocenium, cobaltocene/cobaltocenium and nickelocene/nickelocenium: from gas phase ionization energy to one-electron reduction potential in solvated medium. Phys Chem Chem Phys 2023. [PMID: 37325896 DOI: 10.1039/d3cp01904g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
We propose a theoretical procedure for accurate determination of reduction potentials for three metallocene couples, Cp2M+/Cp2M, where M = Fe, Co and Ni. This procedure first computes the gas phase ionization energy (IE) using the explicitly correlated CCSD(T)-F12 method and includes the zero-point energy correction, core-valence electronic correlation, and relativistic and spin-orbit coupling effects. By means of Born-Haber thermochemical cycle, the one-electron reduction potential is obtained as the sum of the gas phase IE and the corresponding Gibbs free energies of solvation (ΔGsolv) for both the neutral and cationic species. Among the three solvent models (PCM, SMD and uESE) investigated here, it turns out that only the SMD model (computed at the DFT level) gives the best estimation of the value for "ΔGsolv(cation) - ΔGsolv(neutral)" and thus, combining with the accurate IE values, the theoretical protocol is capable of yielding reliable values (in V) for , and . These predictions compare favorably with the available experimental data (in V): , , and . We show that our theoretical procedure is reliable for accurate reduction potential predictions of Cp2Fe+/Cp2Fe, Cp2Co+/Cp2Co and Cp2Ni+/Cp2Ni redox couples in aqueous and non-aqueous media; the maximum absolute deviation is as small as ≈120 mV, which outperforms those of the existing theoretical methods.
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Affiliation(s)
- Hongyan Zhao
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
| | - Yi Pan
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
| | - Kai-Chung Lau
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
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2
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Lam CS, Lau KC, Ng CY. High-Level Ab Initio Predictions for the Ionization Energy, Bond Dissociation Energies, and Heats of Formation of Vanadium Methylidyne Radical and Its Cation (VCH/VCH +). J Phys Chem A 2019; 123:7454-7462. [PMID: 31414807 DOI: 10.1021/acs.jpca.9b05493] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ionization energy (IE) of VCH, the 0 K V-CH/VC-H bond dissociation energies (D0s), and the heats of formation at 0 K (ΔHf0°) and 298 K (ΔHf298°) for VCH/VCH+ are predicted by the wave function-based CCSDTQ/CBS approach. This composite-coupled cluster method includes full quadruple excitations in conjunction with the approximation to the complete basis set (CBS) limit. The contributions of zero-point vibrational energy, core-valence (CV) correlation, spin-orbit coupling, and scalar relativistic corrections are taken into account. The present calculations show that adiabatic IE(VCH) = 6.785 eV and demonstrate excellent agreement with an IE value of 6.774 7 ± 0.000 1 eV measured with two-color laser-pulsed field ionization-photoelectron spectroscopy. The CCSDT and MRCI+Q methods which include CV correlations give the best predictions of harmonic frequencies: ω2 (ω2+) (bending) = 534 (650) and 564 (641) cm-1 and the V-CH stretching ω3 (ω3+) = 835 (827) and 856 (857) cm-1 compared with the experimental values. In this work, we offer a streamlined CCSDTQ/CBS approach which shows an error limit (≤20 meV) matching with previous benchmarking efforts for reliable IE and D0 predictions for VCH/VCH+. The CCSDTQ/CBS D0(V+-CH) - D0(V-CH) = -0.012 eV and D0(VC+-H) - D0(VC-H) = 0.345 eV are in good accord with the experimentally derived values of -0.028 4 ± 0.000 1 and 0.355 9 ± 0.000 1 eV, respectively. The present study has demonstrated that the CCSDTQ/CBS protocol can be readily extended to investigate triatomic molecules containing 3d-metals.
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Affiliation(s)
- Chow-Shing Lam
- Department of Chemistry , City University of Hong Kong , Tat Chee Avenue , Kowloon , Hong Kong
| | - Kai-Chung Lau
- Department of Chemistry , City University of Hong Kong , Tat Chee Avenue , Kowloon , Hong Kong
| | - Cheuk-Yiu Ng
- Department of Chemistry , University of California, Davis , Davis , California 95616 , United States
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3
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Garcia GA, Gans B, Krüger J, Holzmeier F, Röder A, Lopes A, Fittschen C, Alcaraz C, Loison JC. Valence shell threshold photoelectron spectroscopy of C3Hx (x = 0–3). Phys Chem Chem Phys 2018. [DOI: 10.1039/c8cp00510a] [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
We present the photoelectron spectra of C3Hx (x = 0–3) formed in a microwave discharge flow-tube reactor by consecutive H abstractions from C3H4 (C3Hx + F → C3Hx−1 + HF (x = 1–4)), but also from F + CH4 schemes by secondary reactions.
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Affiliation(s)
| | | | - Julia Krüger
- Synchrotron SOLEIL
- L'Orme des Merisiers
- Gif sur Yvette
- France
| | - Fabian Holzmeier
- Synchrotron SOLEIL
- L'Orme des Merisiers
- Gif sur Yvette
- France
- Laboratoire de Chimie Physique d'Orsay
| | - Anja Röder
- Synchrotron SOLEIL
- L'Orme des Merisiers
- Gif sur Yvette
- France
| | - Allan Lopes
- CNRS – Université Paris-Sud et Paris-Saclay
- Laboratoire de Chimie Physique
- UMR 8000
- Centre Universitaire Paris-Sud
- 91405 Orsay
| | | | - Christian Alcaraz
- CNRS – Université Paris-Sud et Paris-Saclay
- Laboratoire de Chimie Physique
- UMR 8000
- Centre Universitaire Paris-Sud
- 91405 Orsay
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4
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Pan Y, Luo Z, Chang YC, Lau KC, Ng CY. High-Level ab Initio Predictions for the Ionization Energies, Bond Dissociation Energies, and Heats of Formation of Titanium Oxides and Their Cations (TiOn/TiOn+, n = 1 and 2). J Phys Chem A 2017; 121:669-679. [DOI: 10.1021/acs.jpca.6b09491] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yi Pan
- Department
of Biology and Chemistry, City University of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
| | - Zhihong Luo
- Department
of Chemistry, University of California, Davis, California 95616, United States
| | - Yih-Chung Chang
- Department
of Chemistry, University of California, Davis, California 95616, United States
| | - Kai-Chung Lau
- Department
of Biology and Chemistry, City University of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
| | - C. Y. Ng
- Department
of Chemistry, University of California, Davis, California 95616, United States
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5
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Tan X, Wang W, Li P. Theoretical study on the reaction mechanism of cyclopropenylidene with cyclic CnH2nO (n=2, 3) compounds: Ring expansion process. JOURNAL OF SAUDI CHEMICAL SOCIETY 2016. [DOI: 10.1016/j.jscs.2014.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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6
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Holzmeier F, Fischer I, Kiendl B, Krueger A, Bodi A, Hemberger P. On the absolute photoionization cross section and dissociative photoionization of cyclopropenylidene. Phys Chem Chem Phys 2016; 18:9240-7. [DOI: 10.1039/c6cp01068g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the determination of the absolute photoionization cross section of cyclopropenylidene, c-C3H2, and the heat of formation of the C3H radical and ion derived by the dissociative ionization of the carbene.
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Affiliation(s)
- Fabian Holzmeier
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Benjamin Kiendl
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Anke Krueger
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Andras Bodi
- Paul Scherrer Institut
- CH-5232 Villigen PSI
- Switzerland
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7
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Schuurman MS, Giegerich J, Pachner K, Lang D, Kiendl B, MacDonell RJ, Krueger A, Fischer I. Photodissociation dynamics of cyclopropenylidene, c-C3 H2. Chemistry 2015; 21:14486-95. [PMID: 26385048 DOI: 10.1002/chem.201501624] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Indexed: 11/09/2022]
Abstract
In this joint experimental and theoretical study we characterize the complete dynamical "life cycle" associated with the photoexcitation of the singlet carbene cyclopropenylidene to the lowest lying optically bright excited electronic state: from the initial creation of an excited-state wavepacket to the ultimate fragmentation of the molecule on the vibrationally hot ground electronic state. Cyclopropenylidene is prepared in this work using an improved synthetic pathway for the preparation of the precursor quadricyclane, thereby greatly simplifying the assignment of the molecular origin of the measured photofragments. The excitation process and subsequent non-adiabatic dynamics have been previously investigated employing time-resolved photoelectron spectroscopy and are now complemented with high-level ab initio trajectory simulations that elucidate the specific vibronic relaxation pathways. Lastly, the fragmentation channels accessed by the molecule following internal conversion are probed using velocity map imaging (VMI) so that the identity of the fragmentation products and their corresponding energy distributions can be definitively assigned.
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Affiliation(s)
- Michael S Schuurman
- National Research Council of Canada, 100 Sussex Drive, Ottawa, ON, K1A 0R6 (Canada). .,Department of Chemistry, University of Ottawa, D'Iorio Hall, 10 Marie Curie, Ottawa, ON, K1N 6N5 (Canada).
| | - Jens Giegerich
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany)
| | - Kai Pachner
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany)
| | - Daniel Lang
- Institute of Organic Chemistry, Am Hubland, 97074 Würzburg (Germany)
| | - Benjamin Kiendl
- Institute of Organic Chemistry, Am Hubland, 97074 Würzburg (Germany)
| | - Ryan J MacDonell
- Department of Chemistry, University of Ottawa, D'Iorio Hall, 10 Marie Curie, Ottawa, ON, K1N 6N5 (Canada)
| | - Anke Krueger
- Institute of Organic Chemistry, Am Hubland, 97074 Würzburg (Germany).
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany).
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8
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Luo Z, Chang YC, Pan Y, Lau KC, Ng CY. Rotationally Resolved State-to-State Photoelectron Study of Molybdenum Monoxide Cation (MoO+). J Phys Chem A 2015; 120:4643-54. [DOI: 10.1021/acs.jpca.5b07939] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhihong Luo
- Department
of Chemistry, University of California, Davis, California 95616, United States
- Department
of Physics, Tsinghua University, Beijing 100084, China
| | - Yih-Chung Chang
- Department
of Chemistry, University of California, Davis, California 95616, United States
| | - Yi Pan
- Department
of Biology and Chemistry, City University of Hong Kong, 80 Tat
Chee Avenue, Kowloon, Hong Kong
| | - Kai-Chung Lau
- Department
of Biology and Chemistry, City University of Hong Kong, 80 Tat
Chee Avenue, Kowloon, Hong Kong
| | - C. Y. Ng
- Department
of Chemistry, University of California, Davis, California 95616, United States
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9
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Chang YC, Luo Z, Pan Y, Zhang Z, Song YN, Kuang SY, Yin QZ, Lau KC, Ng CY. Rotationally resolved state-to-state photoionization and the photoelectron study of vanadium monocarbide and its cations (VC/VC+). Phys Chem Chem Phys 2015; 17:9780-93. [DOI: 10.1039/c5cp00371g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Two-color VIS-UV laser pulsed filed ionization-photoelectron (PFI-PE) study and theoretical predictions for vanadium monocarbide (VC) neutral and its cation (VC+).
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Affiliation(s)
| | - Zhihong Luo
- Department of Chemistry
- University of California
- Davis
- USA
| | - Yi Pan
- Department of Biology and Chemistry
- City University of Hong Kong
- Kowloon
- Hong Kong
| | - Zheng Zhang
- Department of Chemistry
- University of California
- Davis
- USA
| | - Ying-Nan Song
- Department of Chemistry
- University of California
- Davis
- USA
| | | | - Qing Zhu Yin
- Department of Earth and Planetary Science
- University of California
- Davis
- USA
| | - Kai-Chung Lau
- Department of Biology and Chemistry
- City University of Hong Kong
- Kowloon
- Hong Kong
| | - C. Y. Ng
- Department of Chemistry
- University of California
- Davis
- USA
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10
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Tan X, Wang W, Jing Y, Wang F, Li P. Theoretical study on the reaction mechanism of cyclopropenylidene with azacyclopropane: ring expansion process. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1174-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Tan X, Wang W, Sun Q, Jing Y, Li P. Theoretical study of the ring expansion reaction mechanism of cyclopropenylidene with azetidine. J Mol Model 2014; 20:2088. [PMID: 24535106 DOI: 10.1007/s00894-014-2088-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 11/13/2013] [Indexed: 11/29/2022]
Abstract
The mechanism for the ring expansion reaction between cyclopropenylidene and azetidine was systematically investigated employing second-order Møller-Plesset perturbation theory (MP2) in order to better understand the reactivity of cyclopropenylidene with the four-membered ring compound azetidine. Geometry optimizations and vibrational analyses were performed for the stationary points on the potential energy surfaces of the system. The results of our calculations show that cyclopropenylidene can insert into azetidine at its C-N or C-C bond. From a kinetic viewpoint, it is easier for cyclopropenylidene to insert into the C-N bond of azetidine than into the C-C bond. During the first insertion step and the second ring-opening step, it forms spiro and carbene intermediates, respectively. In the following two H-transfer steps, the carbene intermediate forms allenes and alkynes, respectively, as products. From a thermodynamic perspective, allenes are the dominant product because the reaction is exothermic by 373.4 kJ/mol⁻¹.
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Affiliation(s)
- Xiaojun Tan
- College of Medical and Life Science, University of Jinan, Jinan, Shandong, 250022, People's Republic of China,
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12
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Giegerich J, Petersen J, Mitrić R, Fischer I. Photodissociation dynamics of propargylene, HCCCH. Phys Chem Chem Phys 2014; 16:6294-302. [DOI: 10.1039/c3cp53213e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a joint theoretical and experimental study on the photodissociation of the C3H2 isomer propargylene, HCCCH, combining velocity map imaging with nonadiabatic surface hopping calculations.
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Affiliation(s)
- Jens Giegerich
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg, Germany
| | - Jens Petersen
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg, Germany
| | - Roland Mitrić
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg, Germany
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg, Germany
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13
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Lau KC, Pan Y, Lam CS, Huang H, Chang YC, Luo Z, Shi X, Ng CY. High-level ab initio predictions for the ionization energy, bond dissociation energies, and heats of formation of cobalt carbide (CoC) and its cation (CoC+). J Chem Phys 2013; 138:094302. [DOI: 10.1063/1.4792718] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Goldsmith CF, Magoon GR, Green WH. Database of Small Molecule Thermochemistry for Combustion. J Phys Chem A 2012; 116:9033-57. [DOI: 10.1021/jp303819e] [Citation(s) in RCA: 149] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Franklin Goldsmith
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Inorganic Chemistry, Fritz-Haber Institute, 14195 Berlin,
Germany
| | - Gregory R. Magoon
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - William H. Green
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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15
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Tan X, Li Z, Sun Q, Li P, Wang W. Theoretical Study on the Mechanism of the Addition Reaction between Cyclopropenylidene and Formaldehyde. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.6.1934] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Theoretical study on the reaction mechanisms between propadienylidene and R–H (R=F, OH, NH2, CH3): an alternative approach to the formation of alkyne. Struct Chem 2012. [DOI: 10.1007/s11224-012-0030-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Gao H, Xu Y, Yang L, Lam CS, Wang H, Zhou J, Ng CY. High-resolution threshold photoelectron study of the propargyl radical by the vacuum ultraviolet laser velocity-map imaging method. J Chem Phys 2011; 135:224304. [DOI: 10.1063/1.3664864] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Lam CS, Wang H, Xu Y, Lau KC, Ng CY. A vacuum-ultraviolet laser pulsed field ionization-photoelectron study of sulfur monoxide (SO) and its cation (SO+). J Chem Phys 2011; 134:144304. [DOI: 10.1063/1.3575227] [Citation(s) in RCA: 11] [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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20
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Lo PK, Lau KC. High-Level ab Initio Predictions for the Ionization Energies and Heats of Formation of Five-Membered-Ring Molecules: Thiophene, Furan, Pyrrole, 1,3-Cyclopentadiene, and Borole, C4H4X/C4H4X+ (X = S, O, NH, CH2, and BH). J Phys Chem A 2011; 115:932-9. [DOI: 10.1021/jp110499c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Po-Kam Lo
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
| | - Kai-Chung Lau
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
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21
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Steinbauer M, Lang M, Fischer I, de Miranda BKC, Romanzin C, Alcaraz C. The photoionisation of propargylene and diazopropyne. Phys Chem Chem Phys 2011; 13:17956-9. [DOI: 10.1039/c1cp22265a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Hemberger P, Noller B, Steinbauer M, Fischer I, Alcaraz C, Cunha de Miranda BK, Garcia GA, Soldi-Lose H. Threshold Photoelectron Spectroscopy of Cyclopropenylidene, Chlorocyclopropenylidene, and Their Deuterated Isotopomeres. J Phys Chem A 2010; 114:11269-76. [DOI: 10.1021/jp104019d] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Patrick Hemberger
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Bastian Noller
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Michael Steinbauer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Christian Alcaraz
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Bárbara K. Cunha de Miranda
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Gustavo A. Garcia
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
| | - Héloïse Soldi-Lose
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Laboratoire de Chimie-Physique, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay Cedex, France, Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, 24210- 340, Niterói, RJ, Brazil, and Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, Cedex, France
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23
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Lau KC, Chang YC, Lam CS, Ng CY. High-Level ab Initio Predictions for the Ionization Energy, Bond Dissociation Energies, and Heats of Formations of Iron Carbide (FeC) and Its Cation (FeC+). J Phys Chem A 2009; 113:14321-8. [DOI: 10.1021/jp903218h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kai-Chung Lau
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, and Department of Chemistry, University of California, Davis, Davis, California 95616
| | - Yih-Chung Chang
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, and Department of Chemistry, University of California, Davis, Davis, California 95616
| | - Chow-Shing Lam
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, and Department of Chemistry, University of California, Davis, Davis, California 95616
| | - C. Y. Ng
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, and Department of Chemistry, University of California, Davis, Davis, California 95616
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Vázquez J, Harding ME, Gauss J, Stanton JF. High-Accuracy Extrapolated ab Initio Thermochemistry of the Propargyl Radical and the Singlet C3H2 Carbenes. J Phys Chem A 2009; 113:12447-53. [DOI: 10.1021/jp9029908] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Juana Vázquez
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, and Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - Michael E. Harding
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, and Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - Jürgen Gauss
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, and Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - John F. Stanton
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, and Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
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25
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Lau KC, Zheng W, Wong NB, Li WK. Theoretical prediction of the ionization energies of the C4H7 radicals: 1-Methylallyl, 2-methylallyl, cyclopropylmethyl, and cyclobutyl radicals. J Chem Phys 2007; 127:154302. [DOI: 10.1063/1.2774972] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Li J, Yang J, Mo Y, Lau KC, Qian XM, Song Y, Liu J, Ng CY. Combined vacuum ultraviolet laser and synchrotron pulsed field ionization study of CH2BrCl. J Chem Phys 2007; 126:184304. [PMID: 17508800 DOI: 10.1063/1.2730829] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The pulsed field ionization-photoelectron (PFI-PE) spectrum of bromochloromethane (CH2BrCl) in the region of 85,320-88,200 cm-1 has been measured using vacuum ultraviolet laser. The vibrational structure resolved in the PFI-PE spectrum was assigned based on ab initio quantum chemical calculations and Franck-Condon factor predictions. At energies 0-1400 cm-1 above the adiabatic ionization energy (IE) of CH2BrCl, the Br-C-Cl bending vibration progression (nu1+=0-8) of CH2BrCl+ is well resolved and constitutes the major structure in the PFI-PE spectrum, whereas the spectrum at energies 1400-2600 cm-1 above the IE(CH2BrCl) is found to exhibit complex vibrational features, suggesting perturbation by the low lying excited CH2BrCl+(A 2A") state. The assignment of the PFI-PE vibrational bands gives the IE(CH2BrCl)=85,612.4+/-2.0 cm-1 (10.6146+/-0.0003 eV) and the bending frequencies nu1+(a1')=209.7+/-2.0 cm-1 for CH2BrCl+(X2A'). We have also examined the dissociative photoionization process, CH2BrCl+hnu-->CH2Cl++Br+e-, in the energy range of 11.36-11.57 eV using the synchrotron based PFI-PE-photoion coincidence method, yielding the 0 K threshold or appearance energy AE(CH2Cl+)=11.509+/-0.002 eV. Combining the 0 K AE(CH2Cl+) and IE(CH2BrCl) values obtained in this study, together with the known IE(CH2Cl), we have determined the 0 K bond dissociation energies (D0) for CH2Cl+-Br (0.894+/-0.002 eV) and CH2Cl-Br (2.76+/-0.01 eV). We have also performed CCSD(T, full)/complete basis set (CBS) calculations with high-level corrections for the predictions of the IE(CH2BrCl), AE(CH2Cl+), IE(CH2Cl), D0(CH2Cl+-Br), and D0(CH2Cl-Br). The comparison between the theoretical predictions and experimental determinations indicates that the CCSD(T, full)/CBS calculations with high-level corrections are highly reliable with estimated error limits of <17 meV.
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Affiliation(s)
- Juan Li
- Key Laboratory for Atomic and Molecular Nanosciences, Department of Physics, Tsinghua University, Beijing 10084, China
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McCunn LR, FitzPatrick BL, Krisch MJ, Butler LJ, Liang CW, Lin JJ. Unimolecular dissociation of the propargyl radical intermediate of the CH+C2H2 and C+C2H3 reactions. J Chem Phys 2006; 125:133306. [PMID: 17029459 DOI: 10.1063/1.2353821] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This paper examines the unimolecular dissociation of propargyl (HCCCH2) radicals over a range of internal energies to probe the CH+HCCH and C+C2H3 bimolecular reactions from the radical intermediate to products. The propargyl radical was produced by 157 nm photolysis of propargyl chloride in crossed laser-molecular beam scattering experiments. The H-loss and H2 elimination channels of the nascent propargyl radicals were observed. Detection of stable propargyl radicals gave an experimental determination of 71.5 (+5-10) kcal/mol as the lowest barrier to dissociation of the radical. This barrier is significantly lower than predictions for the lowest barrier to the radical's dissociation and also lower than calculated overall reaction enthalpies. Products from both H2+HCCC and H+C3H2 channels were detected at energies lower than what has been theoretically predicted. An HCl elimination channel and a minor C-H fission channel were also observed in the photolysis of propargyl chloride.
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Affiliation(s)
- Laura R McCunn
- The James Franck Institute and Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA
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