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GRAYSON MARTIN, SAUER STEPHANPA. The computation of Karplus equation coefficients and their components using self-consistent field and second-order polarization propagator methods. Mol Phys 2009. [DOI: 10.1080/00268970009483401] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- MARTIN GRAYSON
- a Department of Chemistry , The University , Sheffield , S3 7HF , UK
| | - STEPHAN P. A. SAUER
- b Department of Chemistry , University of Copenhagen, Universitetsparken 5 , DK-2100 , Copenhagen Ø , Denmark
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52
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Møgelhøj A, Aidas K, Mikkelsen KV, Sauer SPA, Kongsted J. Prediction of spin-spin coupling constants in solution based on combined density functional theory/molecular mechanics. J Chem Phys 2009; 130:134508. [PMID: 19355752 DOI: 10.1063/1.3098255] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present theory and implementation of calculation of spin-spin coupling constants within combined quantum mechanics/molecular mechanics methods. Special attention is given to the role of explicit solvent polarization as well as the molecular consequences due to hydrogen bonding. The model is generally applicable but is here implemented for the case of density functional theory. First applications to liquid water and acetylene in aqueous solution are presented. Good agreement between theory and experiment is obtained in both cases, thereby showing the strength of our approach. Finally, spin-spin coupling constants across hydrogen bonds are discussed considering for the first time the role of an explicit solvent on this class of spin-spin couplings.
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Affiliation(s)
- Andreas Møgelhøj
- Department of Chemistry, H. C. Ørsted Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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53
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Wilke JJ, Lind MC, Schaefer HF, Császár AG, Allen WD. Conformers of Gaseous Cysteine. J Chem Theory Comput 2009; 5:1511-23. [DOI: 10.1021/ct900005c] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jeremiah J. Wilke
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, and Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary
| | - Maria C. Lind
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, and Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary
| | - Henry F. Schaefer
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, and Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary
| | - Attila G. Császár
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, and Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary
| | - Wesley D. Allen
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, and Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary
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54
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Alkorta I, Elguero J. Cation dinitrogen complexes [N(2)...X...N(2)]+, X+=H+, Li+, Na+, Be(2+), Mg(2+). SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 34:105-109. [PMID: 18406109 DOI: 10.1016/j.ssnmr.2008.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Accepted: 03/04/2008] [Indexed: 05/26/2023]
Abstract
The complexes of dinitrogen with five cations (H(+), Li(+), Na(+), Be(2+) and Mg(2+)) up to four N(2) molecules have been calculated at the MP2/6-311++G(d,p) level. Energetic and geometric aspects have been determined together with absolute shieldings (GIAO). The atoms in molecules methodology has been used to analyze energy, charge and volume of these complexes.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain.
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55
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Alkorta I, Provasi PF, Aucar GA, Elguero J. A computational study of 2J(HH)(gem) indirect spin-spin coupling constants in simple hydrides of the second and third periods. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:356-361. [PMID: 18273860 DOI: 10.1002/mrc.2181] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Several theoretical methods have been used to compute (2)J(HH) in neutral, anionic and cationic HXH hydrides, X being the 14 nuclei from Li to Cl (28 molecules). Since the calculations also provide (1)J(XH) spin-spin coupling constants (SSCC), these have also been analyzed. The best results were obtained using Second-order polarization propagator approximation (SOPPA)/sadJ. The geminal coupling constants appear to be dependent on the electronegativity of the X-atom.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain.
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56
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Gräfenstein J, Cremer D. Efficient density-functional theory integrations by locally augmented radial grids. J Chem Phys 2008; 127:164113. [PMID: 17979325 DOI: 10.1063/1.2794038] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Standard density-functional theory integration grids have proven insufficient for the meta generalized gradient approximation description of weakly bound complexes [E. R. Johnson et al., Chem. Phys. Lett. 394, 334 (2004)]. This is caused by an insufficient radial resolution in the valence region of frequently used standard grids. We present an algorithm for the construction of locally augmented radial grids, which allows us to enhance the resolution of a given radial grid in a specified region, thus increasing the accuracy of the standard grid in a cost-efficient way. Test calculations with the Van Voorhis-Scuseria exchange and correlation functional for the Ar dimer confirm that a suitably constructed, locally augmented radial grid with 100 points provides an accuracy competitive to that of a 250-point nonaugmented grid. Time savings and possible applications for locally augmented radial grids are discussed.
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Affiliation(s)
- Jürgen Gräfenstein
- Department of Chemistry, Göteborg University, S-412 96 Göteborg, Sweden.
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57
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Gräfenstein J, Cremer D. Unusual long-range spin-spin coupling in fluorinated polyenes: a mechanistic analysis. J Chem Phys 2007; 127:174704. [PMID: 17994839 DOI: 10.1063/1.2787001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Nuclear magnetic resonance (NMR) is a prospective means to realize quantum computers. The performance of a NMR quantum computer depends sensitively on the properties of the NMR-active molecule used, where one requirement is a large indirect spin-spin coupling over large distances. F-F spin-spin coupling constants (SSCCs) for fluorinated polyenes F-(CH==CH)n-F (n=1cdots, three dots, centered5) are >9 Hz across distances of more than 10 A. Analysis of the F,F spin-spin coupling mechanism with our recently developed decomposition of J into Orbital Contributions with the help of Orbital Currents and Partial Spin Polarization (J-OCOC-PSP=J-OC-PSP) method reveals that coupling is dominated by the spin-dipole (SD) term due to an interplay between the pi lone-pair orbitals at the F atoms and the pi(C2n) electron system. From our investigations we conclude that SD-dominated SSCCs should occur commonly in molecules with a contiguous pi-electron system between the two coupling nuclei and that a large SD coupling generally is the most prospective way to provide large long-range spin-spin coupling. Our results give guidelines for the design of suitable active molecules for NMR quantum computers.
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58
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Krivdin LB, Khutsishvili SS, Shemyakina OA, Mal'kina AG, Trofimov BA, Contreras RH. Stereochemical study of iminodihydrofurans based on experimental measurements and SOPPA calculations of (13)C-(13)C spin-spin coupling constants. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45:758-65. [PMID: 17661430 DOI: 10.1002/mrc.2044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Configurational assignment and conformational analysis of a series of iminodihydrofurans obtained from cyanoacetylenic alcohols were performed on the basis of experimental measurements and high-level ab initio calculations of their (13)C-(13)C spin-spin coupling constants. The title compounds were shown to form and exist in solution as the individual Z isomers, adopting the orthogonal orientation of the amino, alkylamino and dialkylamino groups and the s-trans orientation of the CONH(2) group at the C(4) position of the 2,5-dihydro-2-iminofuran moiety.
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Affiliation(s)
- Leonid B Krivdin
- A. E. Favorsky Institute of Chemistry, Irkutsk, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033 Irkutsk, Russia.
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59
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Krivdin LB, Rusakov YY, Schmidt EY, Mikhaleva AI, Trofimov BA. Stereochemical Study of 2-Substituted N-Vinylpyrroles. Aust J Chem 2007. [DOI: 10.1071/ch07086] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Stereochemical study of five 2-substituted N-vinylpyrroles obtained via the Trofimov reaction was carried out based on the experimental measurements of their 13C–1H and 13C–13C spin–spin coupling constants substantiated by the high-level ab initio calculations of the parent 2-methyl-N-vinylpyrrole. The title compounds were shown to adopt a predominantly skewed s-trans conformer with a noticeable population (approximately 10%) of the higher-energy skewed s-cis conformation, however, with the exception of 2-tert-butyl-N-vinylpyrrole adopting almost entirely a skewed s-trans conformation.
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60
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Jimeno ML, Alkorta I, Elguero J, Del Bene JE. Computed coupling constants in X(CH3)nH(4-n) moieties where X = 13C and 15N+, and n = 0-4: comparisons with experimental data. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2006; 44:698-707. [PMID: 16671054 DOI: 10.1002/mrc.1840] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Seventy-three unique spin-spin coupling constants have been analyzed for the ten species in the two series X(CH3)nH(4-n), where the central atom X is 13C or 15N+. Thirty-seven experimental values have been obtained from the literature, and several new coupling constants have been measured for the methyl-substituted ammonium ions. Both DFT with the B3LYP functional and ab initio EOM-CCSD calculations have been carried out on these same systems. Coupling constants computed by these two methods are in agreement with experimental values. Some problems related to coupling constants for the cationic ammonium systems have been resolved when these were recomputed at EOM-CCSD for complexes in which NH4+ is hydrogen-bonded to H2O molecules.
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Affiliation(s)
- María-Luisa Jimeno
- Centro de Química Orgánica "Manuel Lora-Tamayo", CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain
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61
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Provasi PF, Sauer SPA. On the Angular Dependence of the Vicinal Fluorine−Fluorine Coupling Constant in 1,2-Difluoroethane: Deviation from a Karplus-like Shape. J Chem Theory Comput 2006; 2:1019-27. [DOI: 10.1021/ct6000973] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patricio F. Provasi
- Department of Physics, University of Northeastern, Av. Libertad 5500, W 3404 AAS Corrientes, Argentina
| | - Stephan P. A. Sauer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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62
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Spin-spin Coupling Constants 13C-13C in Structural Studies: XXXVIII. Nonempirical Calculations: Oximes. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2005. [DOI: 10.1007/s11178-005-0302-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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63
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Provasi PF, Aucar GA, Sanchez M, Alkorta I, Elguero J, Sauer SPA. Interaction Energies and NMR Indirect Nuclear Spin−Spin Coupling Constants in Linear HCN and HNC Complexes. J Phys Chem A 2005; 109:6555-64. [PMID: 16834002 DOI: 10.1021/jp051600t] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cooperativity effects on both the electronic energy and NMR indirect nuclear spin-spin coupling constants J of the linear complexes (HCN)n and (HNC)n (n = 1-6) are discussed. The geometries of the complexes were optimized at the MP2 level by using the cc-pVTZ basis sets. The spin-spin coupling constants were calculated at the level of the second-order polarization propagator approximation with use of the local dense basis set scheme based on the cc-pVTZ-J basis sets. We find strong correlations in the patterns of different properties such as interaction energy, hydrogen bond distances, and spin-spin coupling constants for both series of compounds. The intramolecular spin-spin couplings are with two exceptions dominated by the Fermi contact (FC) mechanism, while the FC term is the only nonvanishing contribution for the intermolecular couplings. The latter do not follow the Dirac vector model and are important only between nearest neighbors.
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Affiliation(s)
- Patricio F Provasi
- Department of Physics, Northeastern University, Av. Libertad 5500, W 3404 AAS Corrientes, Argentina.
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64
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Díez * E, Casanueva J, San Fabián J, Esteban AL, Galache MP, Barone V, Peralta JE, Contreras RH. Prediction of vicinal proton–proton coupling constants3JHHfrom density functional theory calculations. Mol Phys 2005. [DOI: 10.1080/00268970412331333131] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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65
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On the Usage of Locally Dense Basis Sets in the Calculation of NMR Indirect Nuclear Spin–Spin Coupling Constants: Vicinal Fluorine–Fluorine Couplings. ADVANCES IN QUANTUM CHEMISTRY 2005. [DOI: 10.1016/s0065-3276(05)48012-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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66
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Melo JI, Ruiz de Azua MC, Giribet CG, Aucar GA, Provasi PF. Relativistic effects on nuclear magnetic shielding constants in HX and CH3X (X=Br,I) based on the linear response within the elimination of small component approach. J Chem Phys 2004; 121:6798-808. [PMID: 15473737 DOI: 10.1063/1.1787495] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Numerical calculations of relativistic effects on nuclear magnetic shielding constants sigma corresponding to all one-body operators obtained within a formalism developed in previous work were carried out. In this formalism, the elimination of small component scheme is applied to evaluate all quantities entering a four-component RSPT(2) expression of magnetic molecular properties. HX and CH3X (X=Br,I) were taken as model compounds. Calculations were carried out at the Hartree-Fock level for first-order quantities, and at the random-phase approximation (RPA) level for second- and third-order ones. It was found that values of sigma(X) are largely affected by several relativistic corrections not previously considered in the bibliography. sigma Values of the H nucleus are in close agreement with four-component RPA ones. Overall relativistic effects on the shift of sigma(X) from HX to CH3X are smaller than the nonrelativistic shifts.
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Affiliation(s)
- J I Melo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Cdad. Universitaria, Pab. 1, 1428 Buenos Aires, Argentina
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67
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Provasi PF, Aucar GA, Sauer SPA. Large Long-Range F−F Indirect Spin−Spin Coupling Constants. Prediction of Measurable F−F Couplings over a Few Nanometers. J Phys Chem A 2004. [DOI: 10.1021/jp048686v] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Patricio F. Provasi
- Department of Physics, University of Northeastern, Av. Libertad 5500, W 3404 AAS Corrientes, Argentina, and Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Gustavo A. Aucar
- Department of Physics, University of Northeastern, Av. Libertad 5500, W 3404 AAS Corrientes, Argentina, and Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Stephan P. A. Sauer
- Department of Physics, University of Northeastern, Av. Libertad 5500, W 3404 AAS Corrientes, Argentina, and Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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68
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Nielsen CB, Sauer SPA, Mikkelsen KV. Response theory in the multipole reaction field model for equilibrium and nonequilibrium solvation: Exact theory and the second order polarization propagator approximation. J Chem Phys 2003. [DOI: 10.1063/1.1587131] [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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69
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Barone V, Provasi PF, Peralta JE, Snyder JP, Sauer SPA, Contreras RH. Substituent Effects on Scalar 2J(19F,19F) and 3J(19F,19F) NMR Couplings: A Comparison of SOPPA and DFT Methods. J Phys Chem A 2003. [DOI: 10.1021/jp0300851] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Verónica Barone
- Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina, Department of Physics, North-Eastern University, FACENA, Argentina, Department of Chemistry, Rice University, Houston, Texas, 77005, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Patricio F. Provasi
- Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina, Department of Physics, North-Eastern University, FACENA, Argentina, Department of Chemistry, Rice University, Houston, Texas, 77005, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Juan E. Peralta
- Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina, Department of Physics, North-Eastern University, FACENA, Argentina, Department of Chemistry, Rice University, Houston, Texas, 77005, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - James P. Snyder
- Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina, Department of Physics, North-Eastern University, FACENA, Argentina, Department of Chemistry, Rice University, Houston, Texas, 77005, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Stephan P. A. Sauer
- Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina, Department of Physics, North-Eastern University, FACENA, Argentina, Department of Chemistry, Rice University, Houston, Texas, 77005, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Rubén H. Contreras
- Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina, Department of Physics, North-Eastern University, FACENA, Argentina, Department of Chemistry, Rice University, Houston, Texas, 77005, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
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70
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The Effect of Substituents on Indirect Nuclear Spin-Spin Coupling Constants: Methan- and Ethanimine, Methanal- and Ethanaloxime. Int J Mol Sci 2003. [DOI: 10.3390/i4040231] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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71
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Provasi PF, Aucar GA, Sauer SPA. The effect of lone pairs and electronegativity on the indirect nuclear spin–spin coupling constants in CH2X (X=CH2, NH, O, S):Ab initiocalculations using optimized contracted basis sets. J Chem Phys 2001. [DOI: 10.1063/1.1379331] [Citation(s) in RCA: 234] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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72
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Esteban AL, Galache MP, Mora F, Díez E, Casanueva J, San Fabián J, Barone V, Peralta JE, Contreras RH. Vicinal NMR Proton−Proton Coupling Constants. An NBO Analysis. J Phys Chem A 2001. [DOI: 10.1021/jp0100811] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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73
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Lantto P, Vaara J. Effect of correlating core orbitals in calculations of nuclear spin–spin couplings. J Chem Phys 2001. [DOI: 10.1063/1.1351881] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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