1
|
Lesiuk M. Implementation of the Coupled-Cluster Method with Single, Double, and Triple Excitations using Tensor Decompositions. J Chem Theory Comput 2019; 16:453-467. [DOI: 10.1021/acs.jctc.9b00985] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michał Lesiuk
- Faculty of Chemistry, University of Warsaw, Pasteura 1, Warsaw, 02-093, Poland
| |
Collapse
|
2
|
Key mechanistic insights into the intramolecular C-H bond amination and double bond aziridination in sulfamate esters catalyzed by dirhodium tetracarboxylate complexes. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
3
|
Liu H, Shi D, Sun J, Zhu Z. Excited-states and spectroscopic properties of superoxide anion: a theoretical study including spin–orbit coupling. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1221157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Hui Liu
- College of Physics and Material Science, Henan Normal University, Xinxiang, China
- College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, China,
| | - Deheng Shi
- College of Physics and Material Science, Henan Normal University, Xinxiang, China
| | - Jingfeng Sun
- College of Physics and Material Science, Henan Normal University, Xinxiang, China
| | - Zunlue Zhu
- College of Physics and Material Science, Henan Normal University, Xinxiang, China
| |
Collapse
|
4
|
Odoh SO, Manni GL, Carlson RK, Truhlar DG, Gagliardi L. Separated-pair approximation and separated-pair pair-density functional theory. Chem Sci 2016; 7:2399-2413. [PMID: 29997782 PMCID: PMC6003605 DOI: 10.1039/c5sc03321g] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 12/11/2015] [Indexed: 11/23/2022] Open
Abstract
Multi-configuration pair-density functional theory (MC-PDFT) has proved to be a powerful way to combine the capabilities of multi-configuration self-consistent-field theory to represent the an electronic wave function with a highly efficient way to include dynamic correlation energy by density functional theory. All applications reported previously involved complete active space self-consistent-field (CASSCF) theory for the reference wave function. For treating large systems efficiently, it is necessary to ask whether good accuracy is retained when using less complete configuration interaction spaces. To answer this question, we present here calculations employing MC-PDFT with the separated pair (SP) approximation, which is a special case (defined in this article) of generalized active space self-consistent-field (GASSCF) theory in which no more than two orbitals are included in any GAS subspace and in which inter-subspace excitations are excluded. This special case of MC-PDFT will be called SP-PDFT. In SP-PDFT, the electronic kinetic energy and the classical Coulomb energy, the electronic density and its gradient, and the on-top pair density and its gradient are obtained from an SP approximation wave function; the electronic energy is then calculated from the first two of these quantities and an on-top density functional of the last four. The accuracy of the SP-PDFT method for predicting the structural properties and bond dissociation energies of twelve diatomic molecules and two triatomic molecules is compared to the SP approximation itself and to CASSCF, MC-PDFT based on CASSCF, CASSCF followed by second order perturbation theory (CASPT2), and Kohn-Sham density functional theory with the PBE exchange-correlation potential. We show that SP-PDFT reproduces the accuracy of MC-PDFT based on the corresponding CASSCF wave function for predicting C-H bond dissociation energies, the reaction barriers of pericyclic reactions and the properties of open-shell singlet systems, all at only a small fraction of the computational cost.
Collapse
Affiliation(s)
- Samuel O Odoh
- Department of Chemistry , Chemical Theory Center , Supercomputing Institute , University of Minnesota , 207 Pleasant Street SE , Minneapolis , MN 55455-0431 , USA . ;
| | - Giovanni Li Manni
- Department of Chemistry , Chemical Theory Center , Supercomputing Institute , University of Minnesota , 207 Pleasant Street SE , Minneapolis , MN 55455-0431 , USA . ;
- Max-Planck Institut für Festkörperforshung , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Rebecca K Carlson
- Department of Chemistry , Chemical Theory Center , Supercomputing Institute , University of Minnesota , 207 Pleasant Street SE , Minneapolis , MN 55455-0431 , USA . ;
| | - Donald G Truhlar
- Department of Chemistry , Chemical Theory Center , Supercomputing Institute , University of Minnesota , 207 Pleasant Street SE , Minneapolis , MN 55455-0431 , USA . ;
| | - Laura Gagliardi
- Department of Chemistry , Chemical Theory Center , Supercomputing Institute , University of Minnesota , 207 Pleasant Street SE , Minneapolis , MN 55455-0431 , USA . ;
| |
Collapse
|
5
|
Feller D. Application of a convergent, composite coupled cluster approach to bound state, adiabatic electron affinities in atoms and small molecules. J Chem Phys 2016; 144:014105. [DOI: 10.1063/1.4939184] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
6
|
Liu H, Shi D, Sun J, Zhu Z, Shulin Z. Accurate calculations on the 22 electronic states and 54 spin-orbit states of the O2 molecule: potential energy curves, spectroscopic parameters and spin-orbit coupling. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 124:216-229. [PMID: 24486866 DOI: 10.1016/j.saa.2014.01.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 12/23/2013] [Accepted: 01/05/2014] [Indexed: 06/03/2023]
Abstract
The potential energy curves (PECs) of 54 spin-orbit states generated from the 22 electronic states of O2 molecule are investigated for the first time for internuclear separations from about 0.1 to 1.0nm. Of the 22 electronic states, the X(3)Σg(-), A(')(3)Δu, A(3)Σu(+), B(3)Σu(-), C(3)Πg, a(1)Δg, b(1)Σg(+), c(1)Σu(-), d(1)Πg, f(1)Σu(+), 1(5)Πg, 1(3)Πu, 2(3)Σg(-), 1(5)Σu(-), 2(1)Σu(-) and 2(1)Δg are found to be bound, whereas the 1(5)Σg(+), 2(5)Σg(+), 1(1)Πu, 1(5)Δg, 1(5)Πu and 2(1)Πu are found to be repulsive ones. The B(3)Σu(-) and d(1)Πg states possess the double well. And the 1(3)Πu, C(3)Πg, A'(3)Δu, 1(5)Δg and 2(5)Σg(+) states are the inverted ones when the spin-orbit coupling is included. The PEC calculations are done by the complete active space self-consistent field (CASSCF) method, which is followed by the internally contracted multireference configuration interaction (icMRCI) approach with the Davidson correction. Core-valence correlation and scalar relativistic corrections are taken into account. The convergence of present calculations is evaluated with respect to the basis set and level of theory. The vibrational properties are discussed for the 1(5)Πg, 1(3)Πu, d(1)Πg and 1(5)Σu(-) states and for the second well of the B(3)Σu(-) state. The spin-orbit coupling effect is accounted for by the state interaction method with the Breit-Pauli Hamiltonian. The PECs of all the electronic states and spin-orbit states are extrapolated to the complete basis set limit. The spectroscopic parameters are obtained, and compared with available experimental and other theoretical results. Analyses demonstrate that the spectroscopic parameters reported here can be expected to be reliably predicted ones. The conclusion is obtained that the effect of spin-orbit coupling on the spectroscopic parameters are small almost for all the electronic states involved in this paper except for the 1(5)Σu(-), 1(5)Πg and 1(3)Πu.
Collapse
Affiliation(s)
- Hui Liu
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China; College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Deheng Shi
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China.
| | - Jinfeng Sun
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Zunlue Zhu
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Zhang Shulin
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| |
Collapse
|
7
|
Makarov VI, Kochubei SA, Khmelinskii I. Photodissociation of (SO2⋯XH) Van der Waals complexes and clusters (XH = C2H2, C2H4, C2H6) excited at 32 040–32 090 cm−1 with formation of HSO2 and X. J Chem Phys 2014; 140:054304. [DOI: 10.1063/1.4863445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
8
|
Barrientos C, Rayón VM, Largo A, Sordo JÁ, Redondo P. Kinetics studies of the reactions of main fourth-period monocations (Ga+, Ge+, As+, and Se+) with methyl fluoride. J Phys Chem A 2013; 117:7742-53. [PMID: 23859563 DOI: 10.1021/jp405601y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Thermodynamics and kinetics theoretical studies on the gas-phase reactions of fluoromethane with main fourth-period monocations (Ga(+), Ge(+), As(+), and Se(+)) have been carried out. Density functional theory (in particular mPW1K functional) was employed in the description of the potential energy surfaces, and refinement of the energies were done at the CCSD(T) level. The reaction rate constants were estimated using variational/conventional microcanonical transition state theory. From a thermodynamic viewpoint, the fluorine abstraction product is predicted for Ga(+) and Ge(+), whereas for As(+) and Se(+) the elimination product, MCH2(+) (M = As, Se) + HF, is the preferred one. Nevertheless, the most favorable channel for the reactions of CH3F with Ga(+) and Se(+) cations present a net activation barrier. In the case of Ga(+), the reaction proceeds via an addition channel forming the adduct complex, CH3FGa(+), whereas for Se(+) no reaction is found, in agreement with the experiments. The predicted reaction rate constants are in reasonable good agreement with the experimental values available. Apart from the harpoon-like mechanism, our results suggest that an oxidative addition mechanism seems to play a relevant role.
Collapse
Affiliation(s)
- Carmen Barrientos
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid, Spain
| | | | | | | | | |
Collapse
|
9
|
Varela-Álvarez A, Liebeskind LS, Musaev DG. Mechanistic Insights into the Aerobic Cu(I)-Catalyzed Cross-Coupling of S-Acyl Thiosalicylamide Thiol Esters and Boronic Acids. Organometallics 2012; 31:7958-7968. [PMID: 23565023 DOI: 10.1021/om300612u] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Density Functional Theory (DFT) method is used to elucidate the nature of the active species and the mechanism of the aerobic CuI-catalyzed cross-coupling of S-acyl thiosalicylamide thiol esters and boronic acids reported previously (J. Am. Chem. Soc.2007, 129, 15734-15735; Angew. Chem., Int. Ed.2009,48, 1417-1421). The energetically lowest isomer of the proposed active species [LC(O)R1]Cu-(O2)-Cu[LC(O)R1]2+, 2a, (where L = thiolatosalicylamide) is found to be I1(OO,OO) with a μ-η2:η2-peroxo Cu2O2-core, while its isomers I2(OO,OO) with a bis-(μ-O) Cu2O2-core and I3(OO,OO) with a (μ-η1:η1) Cu2O2-core lie only a few kcal/mol higher and separated by 4-7kcal/mol energy barriers. In all these isomers, the thiol ester is coordinated to the Cu-centers via its two O-ends. Isomers with (SO,OO) and (SO,SO) coordination modes of the thiol esters lie slightly higher and are separated with moderate energy barriers. We found the latter isomers to be vital for the reported CuI-templated cross-coupling of S-acyl thiosalicylamide thiol esters and boronic acids under aerobic conditions. The presence of an anion (halide, carboxylate modeled as formate) in the reaction medium is found to be necessary. Its coordination to the active catalyst I1(SO,SO) is the first step of the proposed anion-assisted transmetalation by boronic acid. Overall the transmetalation reaction requires 34.0 kcal/mol and is 24.0 kcal/mol exergonic. This conclusion is in reasonable agreement with available experiments. The C-C bond formation in the transmetalation product requires a 6.3 kcal/mol lower energy barrier and is highly exergonic.
Collapse
Affiliation(s)
- Adrián Varela-Álvarez
- Cherry L. Emerson Center for Scientific Computation, Emory University, 30322 Atlanta, Georgia, USA
| | | | | |
Collapse
|
10
|
Wang F, Pang W, Duffy P. Performance assessment of density functional theory-based models using orbital momentum distributions. MOLECULAR SIMULATION 2012. [DOI: 10.1080/08927022.2011.647816] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
11
|
Theoretical study of the C–F bond activation in methyl fluoride by alkaline-earth metal monocations. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0864-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
12
|
Prochnow E, Harding ME, Gauss J. Parallel Calculation of CCSDT and Mk-MRCCSDT Energies. J Chem Theory Comput 2010; 6:2339-47. [DOI: 10.1021/ct1002016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eric Prochnow
- Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - Michael E. Harding
- Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - Jürgen Gauss
- Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| |
Collapse
|
13
|
Makarov VI, Kochubei SA, Khmelinskii I. Photochemical reaction dynamics in SO2-acetylene complexes. J Chem Phys 2010; 132:224309. [DOI: 10.1063/1.3427414] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
|
14
|
González-Lafont À, Lluch JM, Varela-Álvarez A, Sordo JA. Canonical Variational Transition-State Theory Study of the CF3CHFCH2F + OH Reaction. J Phys Chem A 2010; 114:2768-77. [DOI: 10.1021/jp909675u] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Àngels González-Lafont
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain and Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, 33006 Oviedo, Principado de Asturias, Spain
| | - José M. Lluch
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain and Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, 33006 Oviedo, Principado de Asturias, Spain
| | - Adrián Varela-Álvarez
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain and Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, 33006 Oviedo, Principado de Asturias, Spain
| | - José A. Sordo
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain and Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, 33006 Oviedo, Principado de Asturias, Spain
| |
Collapse
|
15
|
Varela-Álvarez A, Rayón VM, Redondo P, Barrientos C, Sordo JA. Gas-phase reaction between calcium monocation and fluoromethane: Analysis of the potential energy hypersurface and kinetics calculations. J Chem Phys 2009; 131:144309. [DOI: 10.1063/1.3247287] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
|
16
|
Varela-Álvarez A, Marković D, Vogel P, Sordo JÁ. Desulfinylation of Prop-2-enesulfinic Acid: Experimental Results and Mechanistic Theoretical Analysis. J Am Chem Soc 2009; 131:9547-61. [DOI: 10.1021/ja901565s] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Adrián Varela-Álvarez
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, Principado de Asturias, Spain, and Laboratoire de glycochimie et de synthèse asymétrique (LGSA), Swiss Federal Institute of Technology of Lausanne (EPFL), CH 1015 Lausanne, Switzerland
| | - Dean Marković
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, Principado de Asturias, Spain, and Laboratoire de glycochimie et de synthèse asymétrique (LGSA), Swiss Federal Institute of Technology of Lausanne (EPFL), CH 1015 Lausanne, Switzerland
| | - Pierre Vogel
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, Principado de Asturias, Spain, and Laboratoire de glycochimie et de synthèse asymétrique (LGSA), Swiss Federal Institute of Technology of Lausanne (EPFL), CH 1015 Lausanne, Switzerland
| | - José Ángel Sordo
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Universidad de Oviedo, Principado de Asturias, Spain, and Laboratoire de glycochimie et de synthèse asymétrique (LGSA), Swiss Federal Institute of Technology of Lausanne (EPFL), CH 1015 Lausanne, Switzerland
| |
Collapse
|
17
|
Morell C, Labet V, Grand A, Chermette H. Minimum electrophilicity principle: an analysis based upon the variation of both chemical potential and absolute hardness. Phys Chem Chem Phys 2009; 11:3417-23. [DOI: 10.1039/b818534d] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Duffy P, Sordo JA, Wang F. Valence orbital response to pseudorotation of tetrahydrofuran: A snapshot using dual space analysis. J Chem Phys 2008; 128:125102. [DOI: 10.1063/1.2838852] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
19
|
Kassaee MZ, Ghambarian M, Musavi SM. Halogen switching of azacarbenes C2NH ground states at ab initio and DFT levels. HETEROATOM CHEMISTRY 2008. [DOI: 10.1002/hc.20442] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
20
|
Rayón VM, Sordo JA. Pseudorotation motion in tetrahydrofuran: an ab initio study. J Chem Phys 2007; 122:204303. [PMID: 15945720 DOI: 10.1063/1.1899123] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The use of different models based on experimental information about the observed level splitings, rotational constants, and far-infrared transition frequencies leads to different predictions on the equilibrium geometry for tetrahydrofuran. High-level ab initio calculations [coupled cluster singles, doubles (triples)/complete basis set (second order Moller-Plesset triple, quadrupole, quintuple)+zero-point energy(anharmonic)] suggest that the equilibrium conformation of tetrahydrofuran is an envelope C(s) structure. The theoretical geometrical parameters might be helpful to plan further microwave spectroscopic studies in order to get a physical interpretation of the measurements.
Collapse
Affiliation(s)
- Víctor M Rayón
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| | | |
Collapse
|
21
|
Davis WB, Hefferlin R. An atlas of forecasted molecular data. 2. Vibration frequencies of main-group and transition-metal neutral gas-phase diatomic molecules in the ground state. J Chem Inf Model 2006; 46:820-5. [PMID: 16563013 DOI: 10.1021/ci050439g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This atlas of diatomic-molecular vibration frequencies parallels the previously offered Atlas of Internuclear Separations. The Atlas was produced by mining the data from Huber and Herzberg and training neural network software to forecast new data. New protocols were employed with the powerful software, which was originally designed for forecasting the financial markets. The Atlas presents 1920 additional vibration frequencies for use until critical tables are available to fill the needs more precisely. The precision of the predictions is characterized by the average fractional 1% confidence limit, that is, 10.66%. The accuracies of the predictions are determined in two ways. First, 221 of the 224 Huber and Herzberg data values used for training and validation fall within the prediction confidence limits or fall outside by less than 10% of the Huber and Herzberg values, and 181 values agree (within the limits). Second, 87 of 101 comparison data values, consisting of literature data and some additional Huber and Herzberg values, fall within the prediction confidence limits or fall outside by less than half the prediction values, and 44 of the 101 values agree (within the limits).
Collapse
|
22
|
Klein RA, Zottola MA. Pople versus Dunning basis-sets for group IA metal hydrides and some other second row hydrides: The case against a De Facto standard. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2005.11.083] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
23
|
|
24
|
Lu SI. Electron affinities with diffusion quantum Monte Carlo for C2 and BO molecules. J Chem Phys 2004; 121:10495-7. [PMID: 15549931 DOI: 10.1063/1.1811610] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
To verify the performance of the fixed-node diffusion quantum Monte Carlo method in electron affinities calculations, the adiabatic electron affinities of C(2) and BO molecules calculated by the fixed-node Ornstein-Uhlenbeck diffusion quantum Monte Carlo simulations guiding by trial wave functions constructed from the floating spherical Gaussian orbitals and spherical Gaussian geminals are presented in this work. The random walk based results, 3.264(43) and 2.507(32) eV for C(2) and BO, respectively, are compared with the available best experimental determined values, 3.269(6) and 2.508(8) eV for C(2) and BO, respectively, and the results of other theoretical calculations.
Collapse
Affiliation(s)
- Shih-I Lu
- Department of Applied Chemistry, Fooyin University, 151 Chinhsueh Road, Ta-Liao Hsiang, Kaohsiung Hsien 831, Taiwan.
| |
Collapse
|
25
|
|
26
|
Thøgersen L, Olsen J. A coupled cluster and full configuration interaction study of CN and CN−. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.06.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
27
|
Valdés H, Sordo JA. The N2O·N2O, N2O·SO2, and (N2O)2·SO2 van der Waals Complexes: An ab Initio Theoretical Analysis. J Phys Chem A 2004. [DOI: 10.1021/jp0367880] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. Valdés
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, 33006, Oviedo, Principado de Asturias, Spain
| | - J. A. Sordo
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, 33006, Oviedo, Principado de Asturias, Spain
| |
Collapse
|
28
|
Zahradník R, Šroubková L. Estimates of quantum chemical molecular characteristics for complete basis sets. Isr J Chem 2003. [DOI: 10.1560/kjpv-mpgq-nvvx-252k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
29
|
Braña P, Sordo JA. Theoretical approach to the mechanism of reactions between halogen atoms and unsaturated hydrocarbons: The Cl + propene reaction. J Comput Chem 2003; 24:2044-62. [PMID: 14531058 DOI: 10.1002/jcc.10360] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The potential energy surface for the Cl + propene reaction was analyzed at the MP2 level using Pople's 6-31G(d,p) and 6-311+G(d,p), and Dunning's cc-pVDZ and aug-cc-pVDZ basis sets. Two different channels for the addition reaction leading to chloroalkyl radicals and five alternative channels for the abstraction reaction leading to C(3)H(5) (.) + HCl were explored. The corresponding energy profiles were computed at the QCISD(T)/aug-cc-pVDZ//MP2/aug-cc-pVDZ level of theory. Theoretical results suggest that the previously established mechanism consisting of (1) direct abstraction and (2) addition-elimination steps is instead made up of (1) addition through an intermediate and (2) two-step abstraction processes. No direct abstraction mechanism exists on the potential energy surface. The kinetic equations derived for the new mechanism are consistent with the pressure dependence experimentally observed for this reaction.
Collapse
Affiliation(s)
- Pedro Braña
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Principado de Asturias, Spain
| | | |
Collapse
|
30
|
Ervin KM, Anusiewicz I, Skurski P, Simons J, Lineberger WC. The Only Stable State of O2-Is the X2ΠgGround State and It (Still!) Has an Adiabatic Electron Detachment Energy of 0.45 eV. J Phys Chem A 2003. [DOI: 10.1021/jp0357323] [Citation(s) in RCA: 216] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
31
|
Affiliation(s)
- H. Valdés
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Principado de Asturias, Spain
| | - J. A. Sordo
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Principado de Asturias, Spain
| |
Collapse
|
32
|
Musiał M, Bartlett RJ. Equation-of-motion coupled cluster method with full inclusion of connected triple excitations for electron-attached states: EA-EOM-CCSDT. J Chem Phys 2003. [DOI: 10.1063/1.1584657] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
33
|
Chen ES, Chen ECM. Semiempirical Characterization of Homonuclear Diatomic Ions: 6. Group VI and VII Anions. J Phys Chem A 2002. [DOI: 10.1021/jp0268922] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Edward S. Chen
- Center for High Performance Software, Rice University, Houston, Texas 77005, and University of Houston Clear Lake, 4039 Drummond, Houston, Texas 77025
| | - Edward C. M. Chen
- Center for High Performance Software, Rice University, Houston, Texas 77005, and University of Houston Clear Lake, 4039 Drummond, Houston, Texas 77025
| |
Collapse
|
34
|
Song KS, Cheng YH, Fu Y, Liu L, Li XS, Guo QX. Radical Stabilization Energies of Substituted XNH• Radicals. J Phys Chem A 2002. [DOI: 10.1021/jp020610g] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ke-Sheng Song
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China, Department of Chemistry, Columbia University, New York, New York 10027, and Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| | - Yu-Hui Cheng
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China, Department of Chemistry, Columbia University, New York, New York 10027, and Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| | - Yao Fu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China, Department of Chemistry, Columbia University, New York, New York 10027, and Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| | - Lei Liu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China, Department of Chemistry, Columbia University, New York, New York 10027, and Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| | - Xiao-Song Li
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China, Department of Chemistry, Columbia University, New York, New York 10027, and Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| | - Qing-Xiang Guo
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China, Department of Chemistry, Columbia University, New York, New York 10027, and Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| |
Collapse
|
35
|
Affiliation(s)
- H. Valdés
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Principado de Asturias, Spain
| | - J. A. Sordo
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Principado de Asturias, Spain
| |
Collapse
|
36
|
NEOGRÁDY PAVEL, MEDVEĎ MIROSLAV, ČERNUŠÁK IVAN, URBAN MIROSLAV. Benchmark calculations of some molecular properties of O2, CN and other selected small radicals using the ROHF-CCSD(T) method. Mol Phys 2002. [DOI: 10.1080/00268970110095660] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
37
|
Gauss J, Stanton JF. Analytic gradients for the coupled-cluster singles, doubles, and triples (CCSDT) model. J Chem Phys 2002. [DOI: 10.1063/1.1429244] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
38
|
Rienstra-Kiracofe JC, Tschumper GS, Schaefer HF, Nandi S, Ellison GB. Atomic and molecular electron affinities: photoelectron experiments and theoretical computations. Chem Rev 2002; 102:231-82. [PMID: 11782134 DOI: 10.1021/cr990044u] [Citation(s) in RCA: 851] [Impact Index Per Article: 38.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
39
|
Gauss J. Analytic second derivatives for the full coupled-cluster singles, doubles, and triples model: Nuclear magnetic shielding constants for BH, HF, CO, N[sub 2], N[sub 2]O, and O[sub 3]. J Chem Phys 2002. [DOI: 10.1063/1.1462612] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
40
|
Sancho-García JC, Pérez-Jiménez AJ, Moscardó F. Description of C(sp2)−C(sp2) Rotation in Butadiene by Density Functionals. J Phys Chem A 2001. [DOI: 10.1021/jp0120615] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. C. Sancho-García
- Departamento de Química Física, Universidad de Alicante, 03080 Alicante, Spain
| | - A. J. Pérez-Jiménez
- Departamento de Química Física, Universidad de Alicante, 03080 Alicante, Spain
| | - F. Moscardó
- Departamento de Química Física, Universidad de Alicante, 03080 Alicante, Spain
| |
Collapse
|
41
|
Braña P, Sordo JA. Mechanistic aspects of the abstraction of an allylic hydrogen in the chlorine atom reaction with 2-methyl-1,3-butadiene (isoprene). J Am Chem Soc 2001; 123:10348-53. [PMID: 11603985 DOI: 10.1021/ja011302j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The different channels for the abstraction of an allylic hydrogen in the chlorine atom reaction with isoprene were explored using ab initio methodology. It is shown that the metathesis reaction proceeds through an association-elimination mechanism in which a weakly bound intermediate (HCl.C(5)H(7)(*)) is formed first (formal addition). Further evolution by HCl elimination leads to the final C(5)H(7)(*) radical. QCISD(T)/aug-cc-pVDZ//MP2/6-31G(d,p) calculations show that for two of the possible pathways the barrier heights involved are moderate and the formation of the intermediates are exergonic (DeltaG < 0). Therefore, the mechanism proposed is both kinetically and thermodynamically feasible. The pressure dependence experimentally observed for the Cl + isoprene reaction can be rationalized in terms of the association-elimination mechanism proposed.
Collapse
Affiliation(s)
- P Braña
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, Oviedo, Principado de Asturias, Spain
| | | |
Collapse
|
42
|
Menéndez B, Rayón VM, Sordo JA, Cimas A, Barrientos C, Largo A. The Reaction of N(4S) with CH2F: A Comparative ab Initio and DFT Study. J Phys Chem A 2001. [DOI: 10.1021/jp011760e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bibiana Menéndez
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Spain, and Departamento de Química Física, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| | - Víctor M. Rayón
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Spain, and Departamento de Química Física, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| | - José A. Sordo
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Spain, and Departamento de Química Física, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| | - Alvaro Cimas
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Spain, and Departamento de Química Física, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| | - Carmen Barrientos
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Spain, and Departamento de Química Física, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| | - Antonio Largo
- Laboratorio de Química Computacional, Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, 33006, Oviedo, Spain, and Departamento de Química Física, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
| |
Collapse
|
43
|
|