1
|
Zarycz MNC, Schiel MA, Angelina E, Enriz RD. Covalence and π-electron delocalization influence on hydrogen bonds in proton transfer process of o-hydroxy aryl Schiff bases: A combined NMR and QTAIM analysis. J Chem Phys 2021; 155:054307. [PMID: 34364326 DOI: 10.1063/5.0058422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Within the framework of the density functional theory approach, we studied the relationship between the chemical nature of intramolecular hydrogen bonds (HBs) and nuclear magnetic resonance (NMR) parameters, J-couplings and 1H-chemical shifts [δ(1H)], of the atoms involved in such bonds in o-hydroxyaryl Schiff bases during the proton transfer process. For the first time, the shape of the dependence of the degree of covalence in HBs on 1J(N-H), 1J(O-H), 2hJ(O-N), and δ(1H) during the proton transfer process in o-hydroxyaryl Schiff bases was analyzed. Parameters obtained from Bader's theory of atoms in molecules were used to assess the dependence of covalent character in HBs with both the NMR properties. The influence of π-electronic delocalization on 2hJ(N-O) under the proton transfer process was investigated. 2hJ(O-N) in a Mannich base was also studied in order to compare the results with an unsaturated system. In addition, substituent effects on the phenolic ring were investigated. Our results indicate that the covalent character of HBs on both sides of the transition state undergoes a smooth exponential increase as the δ(1H) moves downfield. The degree of covalence of the N⋯H (O⋯H) bond increases linearly as 1J(N-H) (1J(O-H)) becomes more negative, even after reaching the transition state. Non-vanishing values of spin dipolar (SD) and paramagnetic spin orbital terms of 2hJ(O-N) show that π-electronic delocalization has a non-negligible effect on tautomeric equilibrium and gives evidence of the presence of the resonance assisted HB.Variation of the SD term of 2hJ(O-N) follows a similar pattern as the change in the para-delocalization aromaticity index of the chelate ring.
Collapse
Affiliation(s)
- M Natalia C Zarycz
- Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis; Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL). CONICET, Ejército de los Andes 950, 5700 San Luis, Argentina
| | - M Ayelén Schiel
- Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis; Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL). CONICET, Ejército de los Andes 950, 5700 San Luis, Argentina
| | - Emilio Angelina
- Laboratorio de Estructura Molecular y Propiedades, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste; Instituto de Química Básica y Aplicada (IQUIBA-NEA). CONICET, Avda. Libertad 5460, 3400 Corrientes, Argentina
| | - Ricardo D Enriz
- Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis; Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL). CONICET, Ejército de los Andes 950, 5700 San Luis, Argentina
| |
Collapse
|
2
|
|
3
|
Caputo MC, Alkorta I, Provasi PF, Sauer SPA. Analysis of the interactions in FCCF:(H 2O) and FCCF:(H 2O) 2 complexes through the study of their indirect spin–spin coupling constants. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1488006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- María Cristina Caputo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires y IFIBA – CONICET-UBA, Ciudad Universitaria, Buenos Aires, Argentina
| | - Ibon Alkorta
- Instituto de Química Médica (C.S.I.C.), Madrid, Spain
| | - Patricio F. Provasi
- Department of Physics – IMIT – CONICET, Northeastern University, Corrientes, Argentina
| | | |
Collapse
|
4
|
Theoretical study of physicochemical properties of ionic liquid [mim][C(CN)3]. Chem Heterocycl Compd (N Y) 2016. [DOI: 10.1007/s10593-016-1875-x] [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]
|
5
|
Fadeev DS, Chuikov IP, Mamatyuk VI. A study of NMR parameters of para -substituted polyfluorinated benzyl cations and their precursors. J Fluor Chem 2016. [DOI: 10.1016/j.jfluchem.2015.12.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
6
|
Zarycz MNC, Provasi PF, Sauer SPA. On the truncation of the number of excited states in density functional theory sum-over-states calculations of indirect spin spin coupling constants. J Chem Phys 2015; 143:244107. [PMID: 26723651 DOI: 10.1063/1.4937572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
It is investigated, whether the number of excited (pseudo)states can be truncated in the sum-over-states expression for indirect spin-spin coupling constants (SSCCs), which is used in the Contributions from Localized Orbitals within the Polarization Propagator Approach and Inner Projections of the Polarization Propagator (IPPP-CLOPPA) approach to analyzing SSCCs in terms of localized orbitals. As a test set we have studied the nine simple compounds, CH4, NH3, H2O, SiH4, PH3, SH2, C2H2, C2H4, and C2H6. The excited (pseudo)states were obtained from time-dependent density functional theory (TD-DFT) calculations with the B3LYP exchange-correlation functional and the specialized core-property basis set, aug-cc-pVTZ-J. We investigated both how the calculated coupling constants depend on the number of (pseudo)states included in the summation and whether the summation can be truncated in a systematic way at a smaller number of states and extrapolated to the total number of (pseudo)states for the given one-electron basis set. We find that this is possible and that for some of the couplings it is sufficient to include only about 30% of the excited (pseudo)states.
Collapse
Affiliation(s)
- M Natalia C Zarycz
- Department of Physics, University of Northeastern - CONICET, Av. Libertad 5500, Corrientes W3404AAS, Argentina
| | - Patricio F Provasi
- Department of Physics, University of Northeastern - CONICET, Av. Libertad 5500, Corrientes W3404AAS, Argentina
| | - Stephan P A Sauer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| |
Collapse
|
7
|
Cheisson T, Auffrant A, Nocton G. η5–η1 Switch in Divalent Phosphaytterbocene Complexes with Neutral Iminophosphoranyl Pincer Ligands: Solid-State Structures and Solution NMR 1JYb–P Coupling Constants. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00814] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thibault Cheisson
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| | - Grégory Nocton
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| |
Collapse
|
8
|
Zarycz MNC, Provasi PF. Investigation of the resonance-assisted hydrogen bond in model β-diketones through localized molecular orbital analysis of the spin-spin coupling constants related to the O-H···O hydrogen bond. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2015; 53:120-129. [PMID: 25266873 DOI: 10.1002/mrc.4152] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 08/13/2014] [Accepted: 08/29/2014] [Indexed: 06/03/2023]
Abstract
The resonance-assisted hydrogen bond (HB) phenomenon has been studied theoretically by a localized molecular orbital (LMO) decomposition of the spin-spin coupling constants between atoms either involved or close to the O-H···O system of some β-diketones and their saturated counterparts. The analysis, carried out at the level of the second-order polarization propagator approximation, shows that the contributions in terms of LMO to the paramagnetic spin orbital and the spin dipolar Ramsey terms proof the importance of the delocalized π-electron structure supporting the idea of the existence of the resonance-assisted HB phenomenon phenomenon. The LMO contributions to the Fermi contact term indicate mainly the presence of the HB that may or not be linked to the π-electrons.
Collapse
Affiliation(s)
- M Natalia C Zarycz
- Department of Physics, University of Northeastern CONICET, Av. Libertad 5500, Corrientes, Argentina
| | | |
Collapse
|
9
|
Zarycz N, Aucar GA, Védova COD. NMR Spectroscopic Parameters of Molecular Systems with Strong Hydrogen Bonds. J Phys Chem A 2010; 114:7162-72. [DOI: 10.1021/jp1019334] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Natalia Zarycz
- Physics Department, Exact and Natural Science Faculty, Northeastern University of Argentina and Institute of Modeling and Innovation on Technology, IMIT, CONICET-UNNE
| | - Gustavo A. Aucar
- Physics Department, Exact and Natural Science Faculty, Northeastern University of Argentina and Institute of Modeling and Innovation on Technology, IMIT, CONICET-UNNE
| | - Carlos O. Della Védova
- CEQUINOR (UNLP-CONICET) and Departamento de Química, Facultad de Ciencias Exactas - Univ. Nac. de La Plata, CC962 and Laboratorio de Servicios a la Industria y al Sistema Científico (LaSeISiC), UNLP-CIC−CONICET), La Plata (CP 1900), Argentina
| |
Collapse
|
10
|
Provasi PF, A. Sauer SP. Analysis of isotope effects in NMR one-bond indirect nuclear spin–spin coupling constants in terms of localized molecular orbitals. Phys Chem Chem Phys 2009; 11:3987-95. [DOI: 10.1039/b819376b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
11
|
Del Bene JE, Elguero J. (19)F-(19)F and (19)F-(1)H spin-spin coupling constants in cyclic FH polymers (FH)(n), n=2-6. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 34:86-92. [PMID: 17996427 DOI: 10.1016/j.ssnmr.2007.10.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Accepted: 10/03/2007] [Indexed: 05/25/2023]
Abstract
Spin-spin coupling constants (2h)J(F-F), (1)J(F-H), and (1h)J(H-F) have been obtained for cyclic complexes (FH)(n), with n=2-6, from ab initio equation-of-motion coupled cluster singles and doubles (EOM-CCSD) calculations. Although both the Fermi-contact (FC) term and (2h)J(F-F) increase and become positive as the cluster size increases, the FC term is not a good quantitative approximation to (2h)J(F-F). The paramagnetic spin-orbit (PSO) and spin-dipole (SD) terms which contribute to (2h)J(F-F) appear to be sensitive to the orientation of the hydrogen-bonded pair. However, the large increase in the FC term and (2h)J(F-F) as the size of the cluster increases is due primarily to the reorganization of sigma electron densities in both ground and excited states, and is another manifestation of cooperativity effects in hydrogen-bonded cyclic polymers. The FC term and (1)J(F-H) always increase upon complex formation, but (1)J(F-H) increases only slightly as the size of the cluster increases due to a concurrent decrease in the PSO term. The changes in (1)J(F-H) as a function of polymer size reflect the polarization of electron density away from H and toward F in the ground state, and the electron reorganization which occurs in the excited states which couple to the ground states through the FC and PSO operators. The FC term is a good approximation to (1h)J(H-F), and is always negative, indicating that the hydrogen bonds in the FH clusters are traditional hydrogen bonds.
Collapse
Affiliation(s)
- Janet E Del Bene
- Department of Chemistry, Youngstown State University, Youngstown, OH 44555, USA.
| | | |
Collapse
|
12
|
Sauer SPA, Provasi PF. The Anomalous Deuterium Isotope Effect in the NMR Spectrum of Methane: An Analysis in Localized Molecular Orbitals. Chemphyschem 2008; 9:1259-61. [DOI: 10.1002/cphc.200800119] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
13
|
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.
Collapse
|
14
|
Cremer D, Gräfenstein J. Calculation and analysis of NMR spin-spin coupling constants. Phys Chem Chem Phys 2007; 9:2791-816. [PMID: 17538726 DOI: 10.1039/b700737j] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The analysis of NMR spin-spin coupling leads to a unique insight into the electronic structure of closed-shell molecules, provided one is able to decode the different features of the spin-spin coupling mechanism. For this purpose, the physics of spin-spin coupling is described and the way how spin-spin coupling constants (SSCCs) can be quantum mechanically determined. Based on this insight, a set of requirements is derived that guide the development of a quantum mechanical analysis of spin-spin coupling. It is demonstrated that the J-OC-PSP (=J-OC-OC-PSP: Decomposition of J into orbital contributions using orbital currents and partial spin polarization) analysis method fulfills all requirements. J-OC-PSP makes it possible to partition the isotropic indirect SSCC J or its reduced analogue K as well as the four Ramsey terms (Fermi contact (FC), spin dipole (SD), diamagnetic spin orbit (DSO), paramagnetic spin orbit (PSO)) leading to J (or K) into Cartesian components (for the anisotropic Ramsey terms SD, DSO, PSO), orbital contributions or electron interaction terms. For the purpose of decoding the spin-spin coupling mechanism, FC, SD, DSO, and PSO coupling is discussed in detail and related to electronic and bonding features of the molecules in question. The myth of empirical and semiempirical relationships between SSCCs and bonding features is unveiled. It is found that most relationships are only of limited, partly dubious value, often arising from a fortuitous cancellation of terms that cannot be expected in general. These relationships are replaced by quantum chemical relations and descriptions that directly reflect the complex electronic processes leading to spin-spin coupling.
Collapse
Affiliation(s)
- Dieter Cremer
- Department of Chemistry, University of the Pacific, 3601 Pacific Avenue, Stockton, California 95211, USA
| | | |
Collapse
|
15
|
Del Bene JE, Elguero J. Variation of One-bond X−Y Coupling Constants 1J(X−Y) and the Components of 1J(X−Y) with Rotation about the X−Y Bond for Molecules HmX−YHn, with X, Y = 15N, 17O, 31P, 33S: The Importance of Nonbonding Pairs of Electrons. J Phys Chem A 2007; 111:2517-26. [PMID: 17388336 DOI: 10.1021/jp067580s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ab initio EOM-CCSD calculations have been performed on molecules HmX-YHn, for X, Y = 15N, 17O, 31P, and 33S, to investigate the variation of one-bond X-Y spin-spin coupling constants 1J(X-Y) and the components of J with rotation about the X-Y single bond. The reduced Fermi-contact (FC) terms for all 10 molecules are negative and decrease in absolute value as the rotational angle theta changes from 0 degrees, at which point the lone pairs of electrons are on the same side of the X-Y bond, to 180 degrees where they are trans with respect to the X-Y bond. The signs of reduced paramagnetic spin-orbit (PSO) and spin-dipole (SD) terms are opposite that of the FC term and exhibit extremum values as theta approaches 90 degrees, the gauche conformation. While the FC term tends to dominate for molecules H2X-YH2 and H2X-YH, such is not the case for HX-YH, where the PSO and SD terms assume increased importance. Curves for 1K(X-Y) as a function of rotational angle are readily grouped according to formula H2X-YH2, H2X-YH, and HX-YH, which suggests that it is the lone pairs of electrons on X and Y which are primarily responsible for the trends observed.
Collapse
Affiliation(s)
- Janet E Del Bene
- Department of Chemistry, Youngstown State University, Youngstown, Ohio 44555, USA.
| | | |
Collapse
|
16
|
Soncini A, Lazzeretti P. Critique of the Multipath Model for 1J(C,C) Nuclear Spin-Spin Coupling via Electron Current Induced by 13C Nuclear Magnetic Dipoles. Chemphyschem 2006; 7:679-84. [PMID: 16514696 DOI: 10.1002/cphc.200500517] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- A Soncini
- Dipartimento di Chimica, Università degli Studi di Modena e Reggio Emilia via G. Campi 183, 41100 Modena, Italy
| | | |
Collapse
|
17
|
Soncini A, Lazzeretti P. Interpretation of vicinal spin–spin coupling constants in ethane via the current-density induced by nuclear magnetic dipoles. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.05.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
18
|
Gräfenstein J, Tuttle T, Cremer D. Elucidation of the Electronic Structure of Molecules with the Help of NMR Spin−Spin Coupling Constants: The FH Molecule. J Phys Chem A 2005; 109:2325-39. [PMID: 16839003 DOI: 10.1021/jp045463w] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It is demonstrated how the one-bond NMR spin-spin coupling constant (SSCC) (1)J(FH) can be used as a source of information on the electronic structure of the FH molecule. For this purpose, the best possible agreement between measured and calculated SSCC is achieved by large basis set coupled perturbed density functional theory calculations. Then, the calculated value is dissected into its four Ramsey terms: Fermi contact, the paramagnetic spin-orbit term, the diamagnetic spin-orbit term, and the spin dipole term, which in turn are decomposed into orbital contributions and then described by their spin densities and orbital current densities. In this way, the SSCC gives detailed information about the electronegativity of F, the bond polarity, the bond polarizability, the volume and the polarizability of sigma and pi lone pair orbitals, the s- or p-character of the bond orbital, the nature of the LUMO, and the density distribution around F.
Collapse
Affiliation(s)
- Jürgen Gräfenstein
- Department of Theoretical Chemistry, Göteborg University, Reutersgatan 2, S-41320 Göteborg, Sweden
| | | | | |
Collapse
|
19
|
Wrackmeyer B. Indirect Nuclear 77Se?77Se Spin?Spin Coupling Constants. Application of Density Functional Theory (DFT) Calculations. Struct Chem 2005. [DOI: 10.1007/s11224-005-1087-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
20
|
Wrackmeyer B, Köhler C. Bis(trimethylsilyl)diazene revisited. Density functional theory (DFT) calculations of nitrogen NMR parameters of some azo-compounds. HETEROATOM CHEMISTRY 2005. [DOI: 10.1002/hc.20075] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
21
|
Gräfenstein J, Tuttle T, Cremer D. Analysis of long-range NMR spin–spin coupling in polyenes and the π-mechanism. Phys Chem Chem Phys 2005; 7:452-62. [DOI: 10.1039/b416153j] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
22
|
De Kowalewski DG, Contreras * RH, Díez E, Esteban A. NMRJ(C,C) scalar coupling analysis of the effects of substituents on the keto–enol tautomeric equilibrium in 2-OH-n-X-pyridines. An experimental and DFT study. Mol Phys 2004. [DOI: 10.1080/00268970412331292902] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
23
|
Tuttle T, Gräfenstein J, Cremer D. Analysis of the NMR through-space coupling mechanism between 19F atoms. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.06.084] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
24
|
Bouř P, Raich I, Kaminský J, Hrabal R, Čejka J, Sychrovský V. Restricted Conformational Flexibility of Furanose Derivatives: Ab Initio Interpretation of Their Nuclear Spin−Spin Coupling Constants. J Phys Chem A 2004. [DOI: 10.1021/jp037872i] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Petr Bouř
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic, and Department of Analytical Chemistry, Department of Chemistry of Natural Compounds, NMR Laboratory, Department of Solid State Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Ivan Raich
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic, and Department of Analytical Chemistry, Department of Chemistry of Natural Compounds, NMR Laboratory, Department of Solid State Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Jakub Kaminský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic, and Department of Analytical Chemistry, Department of Chemistry of Natural Compounds, NMR Laboratory, Department of Solid State Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Richard Hrabal
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic, and Department of Analytical Chemistry, Department of Chemistry of Natural Compounds, NMR Laboratory, Department of Solid State Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Jan Čejka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic, and Department of Analytical Chemistry, Department of Chemistry of Natural Compounds, NMR Laboratory, Department of Solid State Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Vladimír Sychrovský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10, Prague 6, Czech Republic, and Department of Analytical Chemistry, Department of Chemistry of Natural Compounds, NMR Laboratory, Department of Solid State Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
| |
Collapse
|
25
|
Gräfenstein J, Tuttle T, Cremer D. Decomposition of nuclear magnetic resonance spin–spin coupling constants into active and passive orbital contributions. J Chem Phys 2004; 120:9952-68. [PMID: 15268014 DOI: 10.1063/1.1711598] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The theory of the J-OC-PSP (decomposition of J into orbital contributions using orbital currents and partial spin polarization) method is derived to distinguish between the role of active, passive, and frozen orbitals on the nuclear magnetic resonance (NMR) spin-spin coupling mechanism. Application of J-OC-PSP to the NMR spin-spin coupling constants of ethylene, which are calculated using coupled perturbed density functional theory in connection with the B3LYP hybrid functional and a [7s,6p,2d/4s,2p] basis set, reveal that the well-known pi mechanism for Fermi contact (FC) spin coupling is based on passive pi orbital contributions. The pi orbitals contribute to the spin polarization of the sigma orbitals at the coupling nuclei by mediating spin information between sigma orbitals (spin-transport mechanism) or by increasing the spin information of a sigma orbital by an echo effect. The calculated FC(pi) value of the SSCC (1)J(CC) of ethylene is 4.5 Hz and by this clearly smaller than previously assumed.
Collapse
Affiliation(s)
- Jürgen Gräfenstein
- Department of Theoretical Chemistry, Goteborg University, Reutersgatan 2, S-41320 Goteborg, Sweden
| | | | | |
Collapse
|
26
|
Gräfenstein J, Kraka E, Cremer D. Investigation of the π Character of a C−C Bond with the Help of the Diamagnetic and Paramagnetic Spin−Orbit Term of the NMR Spin−Spin Coupling Constant. J Phys Chem A 2004. [DOI: 10.1021/jp049954s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Jürgen Gräfenstein
- Department of Theoretical Chemistry, Göteborg University, Reutersgatan 2, S-41320 Göteborg, Sweden
| | - Elfi Kraka
- Department of Theoretical Chemistry, Göteborg University, Reutersgatan 2, S-41320 Göteborg, Sweden
| | - Dieter Cremer
- Department of Theoretical Chemistry, Göteborg University, Reutersgatan 2, S-41320 Göteborg, Sweden
| |
Collapse
|
27
|
Gräfenstein J, Cremer D. Analysis of the spin-dipole transmission mechanism for NMR spin–spin coupling constants using orbital contributions, spin polarization, and spin-dipole energy density distribution. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.01.120] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
28
|
Gräfenstein J, Cremer D. One-electron versus electron–electron interaction contributions to the spin–spin coupling mechanism in nuclear magnetic resonance spectroscopy: Analysis of basic electronic effects. J Chem Phys 2004; 121:12217-32. [PMID: 15606240 DOI: 10.1063/1.1825993] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
For the first time, the nuclear magnetic resonance (NMR) spin-spin coupling mechanism is decomposed into one-electron and electron-electron interaction contributions to demonstrate that spin-information transport between different orbitals is not exclusively an electron-exchange phenomenon. This is done using coupled perturbed density-functional theory in conjunction with the recently developed J-OC-PSP [=J-OC-OC-PSP: Decomposition of J into orbital contributions using orbital currents and partial spin polarization)] method. One-orbital contributions comprise Ramsey response and self-exchange effects and the two-orbital contributions describe first-order delocalization and steric exchange. The two-orbital effects can be characterized as external orbital, echo, and spin transport contributions. A relationship of these electronic effects to zeroth-order orbital theory is demonstrated and their sign and magnitude predicted using simple models and graphical representations of first order orbitals. In the case of methane the two NMR spin-spin coupling constants result from totally different Fermi contact coupling mechanisms. (1)J(C,H) is the result of the Ramsey response and the self-exchange of the bond orbital diminished by external first-order delocalization external one-orbital effects whereas (2)J(H,H) spin-spin coupling is almost exclusively mitigated by a two-orbital steric exchange effect. From this analysis, a series of prediction can be made how geometrical deformations, electron lone pairs, and substituent effects lead to a change in the values of (1)J(C,H) and (2)J(H,H), respectively, for hydrocarbons.
Collapse
Affiliation(s)
- Jürgen Gräfenstein
- Department of Theoretical Chemistry, Göteborg University, Reutersgatan 2, S-41320 Göteborg, Sweden
| | | |
Collapse
|