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Viesser RV, Ducati LC, Autschbach J, Tormena CF. Effects of stereoelectronic interactions on the relativistic spin–orbit and paramagnetic components of the 13C NMR shielding tensors of dihaloethenes. Phys Chem Chem Phys 2015; 17:19315-24. [DOI: 10.1039/c5cp02026c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interactions between iodine atoms are responsible for lower 13C NMR shielding for the cis isomers in comparison to trans.
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Affiliation(s)
- Renan V. Viesser
- Chemical Institute
- University of Campinas – UNICAMP
- 13083-970 Campinas
- Brazil
| | - Lucas C. Ducati
- Institute of Chemistry
- University of São Paulo
- 05513-970 São Paulo
- Brazil
| | - Jochen Autschbach
- Department of Chemistry
- University at Buffalo
- State University of New York
- Buffalo
- USA
| | - Cláudio F. Tormena
- Chemical Institute
- University of Campinas – UNICAMP
- 13083-970 Campinas
- Brazil
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Favaro DC, Contreras RH, Tormena CF. The electronic origin of unusually large (n)J(FN) coupling constants in some fluoroximes. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:334-338. [PMID: 23554215 DOI: 10.1002/mrc.3950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 02/21/2013] [Accepted: 03/04/2013] [Indexed: 06/02/2023]
Abstract
SOPPA(CCSD) calculations show that the FC term is the most important contribution to the through-space transmission of JFN coupling constants for the fluoroximes studied in this work. Because of the well-known behavior of FC term, a new rationalization for the experimental (TS)JFN SSCC is presented. It is mainly based on the overlap matrix (Sij) between fluorine and nitrogen lone pairs obtained from NBO analyses. An expression is proposed to take into account the influence of the electronic density (Dij) between coupled nuclei as well as the s% character at the site of the coupling nuclei of bonds and non-bonding electron pairs involved in Dij. In using this approach, a linear correlation between (TS)JFN versus Dij is obtained. The most important aspect of this rationalization is related to the facility for understanding the behavior of some unusual experimental coupling constants. It is shown that, at least in this case, the electronic origin of the so-called through-space coupling is transmitted through to the overlap of orbitals on the coupled atoms, suggesting that, at least for these compounds, instead of through-space coupling, it should better be dubbed as 'through overlapping orbital coupling'.
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Affiliation(s)
- Denize C Favaro
- Chemistry Institute, State University of Campinas, Campinas, Sao Paulo, Brazil
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Vilcachagua JD, Ducati LC, Rittner R, Contreras RH, Tormena CF. Experimental, SOPPA(CCSD), and DFT Analysis of Substitutent Effects on NMR 1JCF Coupling Constants in Fluorobenzene Derivatives. J Phys Chem A 2011; 115:1272-9. [PMID: 21280628 DOI: 10.1021/jp110290b] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Lucas C. Ducati
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil
| | - Roberto Rittner
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil
| | - Rubén H. Contreras
- Department of Physics, FCEyN, University of Buenos Aires and IFIBA-CONICET, Buenos Aires, Argentina
| | - Cláudio F. Tormena
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil
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Neto AC, Ducati LC, Rittner R, Tormena CF, Contreras RH, Frenking G. Heavy Halogen Atom Effect on 13C NMR Chemical Shifts in Monohalo Derivatives of Cyclohexane and Pyran. Experimental and Theoretical Study. J Chem Theory Comput 2009; 5:2222-8. [DOI: 10.1021/ct800520w] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alvaro Cunha Neto
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil, Department of Physics, FCEyN, University of Buenos Aires and CONICET, Buenos Aires, Argentina, and Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
| | - Lucas C. Ducati
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil, Department of Physics, FCEyN, University of Buenos Aires and CONICET, Buenos Aires, Argentina, and Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
| | - Roberto Rittner
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil, Department of Physics, FCEyN, University of Buenos Aires and CONICET, Buenos Aires, Argentina, and Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
| | - Cláudio F. Tormena
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil, Department of Physics, FCEyN, University of Buenos Aires and CONICET, Buenos Aires, Argentina, and Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
| | - Rubén H. Contreras
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil, Department of Physics, FCEyN, University of Buenos Aires and CONICET, Buenos Aires, Argentina, and Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
| | - Gernot Frenking
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil, Department of Physics, FCEyN, University of Buenos Aires and CONICET, Buenos Aires, Argentina, and Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
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Contreras RH, Esteban ÁL, DÍez E, Head NJ, Della EW. Transmission mechanisms of NMR long-range J(13C,19F) scalar couplings in 1-F,4-X-cubanes: a DFT and experimental study. Mol Phys 2006. [DOI: 10.1080/00268970500276499] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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