1
|
Zapata Escobar AD, Maldonado AF, Aucar GA. The LRESC-Loc Model to Analyze Magnetic Shieldings with Localized Molecular Orbitals. J Phys Chem A 2022; 126:9519-9534. [PMID: 36512732 DOI: 10.1021/acs.jpca.2c05604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The leading electronic mechanisms of relativistic effects in the NMR magnetic shieldings of heavy-atom (HA) containing molecules are well described by the linear response with elimination of small components model (LRESC). We show here first results from a new version of the LRESC model written in terms of localized molecular orbitals (LMOs) which is coined as LRESC-Loc. Those LMOs resemble "chemist's orbitals", representing lone-pairs, atomic cores, and bonds. The whole set of relativistic effects are expressed in terms of non-ligand-dependent and ligand-dependent contributions. We show the electronic origin of trends and behavior of different mechanisms in molecular systems which contain heavy elements that belong to any of the IB to VIIA groups of the periodic table. The SO mechanism has a well-defined dependence with the LPs (LPσ and LPπ) when the HAs have them, but the non-SO mechanisms mostly depend on other LMOs. In addition we propose here that the SO mechanism can be used to characterize interactions involving LPs and the non-SO mechanisms to characterize covalent and close-shell interactions. All our main results are in accord with previous findings, though we are now able to analyze them in a different manner.
Collapse
Affiliation(s)
- Andy D Zapata Escobar
- Physics Department, Natural and Exact Science Faculty, Northeastern University of Argentina, Corrientes, W3404AAS, Argentina.,Institute for Modeling and Innovative Technology, IMIT (CONICET-UNNE), Corrientes, W3404AAS, Argentina
| | - Alejandro F Maldonado
- Institute for Modeling and Innovative Technology, IMIT (CONICET-UNNE), Corrientes, W3404AAS, Argentina
| | - Gustavo A Aucar
- Physics Department, Natural and Exact Science Faculty, Northeastern University of Argentina, Corrientes, W3404AAS, Argentina.,Institute for Modeling and Innovative Technology, IMIT (CONICET-UNNE), Corrientes, W3404AAS, Argentina
| |
Collapse
|
2
|
Tkachenko NV, Muñoz-Castro A, Boldyrev AI. Occurrence of Double Bond in π-Aromatic Rings: An Easy Way to Design Doubly Aromatic Carbon-Metal Structures. Molecules 2021; 26:molecules26237232. [PMID: 34885812 PMCID: PMC8659221 DOI: 10.3390/molecules26237232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 11/24/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
A chemical bonding of several metallabenzenes and metallabenzynes was studied via an adaptive natural density partitioning (AdNDP) algorithm and the induced magnetic field analysis. A unique chemical bonding pattern was discovered where the M=C (M: Os, Re) double bond coexists with the delocalized 6c-2e π-bonding elements responsible for aromatic properties of the investigated complexes. In opposition to the previous description where 8 delocalized π-electrons were reported in metallabenzenes and metallabenzynes, we showed that only six delocalized π-electrons are present in those molecules. Thus, there is no deviation from Hückel's aromaticity rule for metallabenzynes/metallabenzenes complexes. Based on the discovered bonding pattern, we propose two thermodynamically stable novel molecules that possess not only π-delocalization but also retain six σ-delocalized electrons, rendering them as doubly aromatic species. As a result, our investigation gives a new direction for the search for carbon-metal doubly aromatic molecules.
Collapse
Affiliation(s)
- Nikolay V. Tkachenko
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA;
- Grupo de Química Inorgánica y Materiales Moleculares, Facultad de Ingeniería, Universidad Autonoma de Chile, El Llano Subercaseaux, Santiago 2801, Chile;
| | - Alvaro Muñoz-Castro
- Grupo de Química Inorgánica y Materiales Moleculares, Facultad de Ingeniería, Universidad Autonoma de Chile, El Llano Subercaseaux, Santiago 2801, Chile;
| | - Alexander I. Boldyrev
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA;
- Correspondence:
| |
Collapse
|
3
|
β-Fluorinated Paraconic Acid Derivatives: Synthesis and Fluorine Stereoelectronic Effects. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
4
|
Abstract
Halogens cause pronounced and systematic effects on the 13C NMR chemical shift (δ13C) of an adjacent carbon nucleus, usually leading to a decrease in the values across the halogen series. Although this normal halogen dependence (NHD) is known in organic and inorganic compounds containing the carbon atom in its neutral and cationic forms, information about carbanions is scarce. To understand how δ13C changes in molecules with different charges, the shielding mechanisms of CHX3, CX3+, and CX3- (X = Cl, Br, or I) systems are investigated via density functional theory calculations and further analyzed by decomposition into contributions of natural localized molecular orbitals. An inverse halogen dependence (IHD) is determined for the anion series as a result of the negative spin-orbit contribution instead of scalar paramagnetic effects. The presence of a carbon nonbonding orbital in anions allows magnetic couplings that generate a deshielding effect on the nucleus and contradicts the classical association between δ13C and atomic charge.
Collapse
Affiliation(s)
- Renan V Viesser
- Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, São Paulo, Brazil.
| | - Cláudio F Tormena
- Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, São Paulo, Brazil.
| |
Collapse
|
5
|
Kashihara M, Gordon CP, Copéret C. Reactivity of Substituted Benzenes toward Oxidative Addition Relates to NMR Chemical Shift of the Ipso-Carbon. Org Lett 2020; 22:8910-8915. [PMID: 33147975 DOI: 10.1021/acs.orglett.0c03300] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The oxidative addition of benzene derivatives to Pd0 catalysts is a key step in cross-coupling reactions. In this work, we show that the ipso-carbon chemical shift of substituted benzenes, and in particular the δ22 component of the chemical shift tensor, correlates with the free energy barrier for oxidative addition. This correlation is traced back to the electron density in the pz orbital of the ipso-carbon (perpendicular of the ring-plane), with high electron densities favoring oxidative addition. The correlation between chemical shift and free energy barrier holds true for a variety of substituted benzenes, making chemical shift a useful descriptor for predicting the reactivity of aromatic substrates in oxidative addition.
Collapse
Affiliation(s)
- Myuto Kashihara
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.,Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland
| | - Christopher P Gordon
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland
| |
Collapse
|
6
|
Vı́cha J, Novotný J, Komorovsky S, Straka M, Kaupp M, Marek R. Relativistic Heavy-Neighbor-Atom Effects on NMR Shifts: Concepts and Trends Across the Periodic Table. Chem Rev 2020; 120:7065-7103. [DOI: 10.1021/acs.chemrev.9b00785] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jan Vı́cha
- Centre of Polymer Systems, Tomas Bata University in Zlı́n, tř. Tomáše Bati 5678, CZ-76001 Zlı́n, Czechia
| | - Jan Novotný
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czechia
| | - Stanislav Komorovsky
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84536 Bratislava, Slovakia
| | - Michal Straka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, CZ-16610 Prague, Czechia
| | - Martin Kaupp
- Institute of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Radek Marek
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czechia
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, CZ-62500 Brno, Czechia
| |
Collapse
|
7
|
Viesser RV, Tormena CF. Counterintuitive deshielding on the 13 C NMR chemical shift for the trifluoromethyl anion. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:540-547. [PMID: 31705544 DOI: 10.1002/mrc.4958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 10/18/2019] [Indexed: 06/10/2023]
Abstract
The trifluoromethyl anion (CF3 - ) displays 13 C NMR chemical shift (175.0 ppm) surprisingly larger than neutral (CHF3 , 122.2 ppm) and cation (CF3 + , 150.7 ppm) compounds. This unexpected deshielding effect for a carbanion is investigated by density functional theory calculations and decomposition analyses of the 13 C shielding tensor into localized molecular orbital contributions. The present work determines the shielding mechanisms involved in the observed behaviour of the fluorinated anion species, shedding light on the experimental NMR data and demystify the classical correlation between electron density and NMR chemical shift. The presence of fluorine atoms induces the carbon lone pair to create a paramagnetic shielding on the carbon nucleus.
Collapse
Affiliation(s)
- Renan V Viesser
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP, 13083-970, Brazil
| | - Cláudio F Tormena
- Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, Campinas, SP, 13083-970, Brazil
| |
Collapse
|
8
|
Mirzaeva IV, Kozlova SG. The Nature of Halogen Dependence of 103Rh NMR Chemical Shift in Complex Anions cis-[X1X2Rh(CO)2]− (X1, X2 = Cl, Br, I). J STRUCT CHEM+ 2019. [DOI: 10.1134/s0022476619110076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
9
|
Ariai J, Saielli G. "Through-Space" Relativistic Effects on NMR Chemical Shifts of Pyridinium Halide Ionic Liquids. Chemphyschem 2019; 20:108-115. [PMID: 30312005 DOI: 10.1002/cphc.201800955] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Indexed: 12/27/2022]
Abstract
We have investigated, using two-component relativistic density functional theory (DFT) at ZORA-SO-BP86 and ZORA-SO-PBE0 level, the occurrence of relativistic effects on the 1 H, 13 C, and 15 N NMR chemical shifts of 1-methylpyridinium halides [MP][X] and 1-butyl-3-methylpyridinium trihalides [BMP][X3 ] ionic liquids (ILs) (X=Cl, Br, I) as a result of a non-covalent interaction with the heavy anions. Our results indicate a sizeable deshielding effect in ion pairs when the anion is I- and I3 - . A smaller, though nonzero, effect is observed also with bromine while chlorine based anions do not produce an appreciable relativistic shift. The chemical shift of the carbon atoms of the aromatic ring shows an inverse halogen dependence that has been rationalized based on the little C-2s orbital contribution to the σ-type interaction between the cation and anion. This is the first detailed account and systematic theoretical investigation of a relativistic heavy atom effect on the NMR chemical shifts of light atoms in the absence of covalent bonds. Our work paves the way and suggests the direction for an experimental investigation of such elusive signatures of ion pairing in ILs.
Collapse
Affiliation(s)
- Jama Ariai
- Department of Chemical Sciences University of Padova, Via Marzolo 1, 35131, Padua, Italy.,Present address: Institute of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany
| | - Giacomo Saielli
- CNR Institute on Membrane Technology, Padova Unit, Via Marzolo 1, 35131, Padua, Italy
| |
Collapse
|
10
|
Vícha J, Komorovsky S, Repisky M, Marek R, Straka M. Relativistic Spin–Orbit Heavy Atom on the Light Atom NMR Chemical Shifts: General Trends Across the Periodic Table Explained. J Chem Theory Comput 2018; 14:3025-3039. [DOI: 10.1021/acs.jctc.8b00144] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jan Vícha
- Center of Polymer Systems, University Institute, Tomas Bata University in Zlín, Třída T. Bati, 5678, CZ-76001, Zlín, Czech Republic
| | - Stanislav Komorovsky
- Institute of Inorganic Chemistry, Slovak Academy of Science, Dúbravská cesta 9, SK-84536 Bratislava, Slovakia
| | - Michal Repisky
- Center for Theoretical and Computational Chemistry, Department of Chemistry, UiT − The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Radek Marek
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5/A4, CZ-62500 Brno, Czech Republic
| | - Michal Straka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-16610, Prague, Czech Republic
| |
Collapse
|
11
|
V. Viesser R, Ducati LC, Tormena CF, Autschbach J. The halogen effect on the 13C NMR chemical shift in substituted benzenes. Phys Chem Chem Phys 2018; 20:11247-11259. [DOI: 10.1039/c8cp01249k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
X (F, Cl, Br, I) and R (NH2, NO2) group effects on 13C NMR chemical shifts are explained by π and σ orbitals, respectively.
Collapse
Affiliation(s)
- Renan V. Viesser
- Institute of Chemistry
- University of Campinas – UNICAMP
- Campinas
- Brazil
| | - Lucas C. Ducati
- Department of Fundamental Chemistry Institute of Chemistry
- University of São Paulo
- São Paulo
- Brazil
| | | | - Jochen Autschbach
- Department of Chemistry
- University at Buffalo
- State University of New York
- Buffalo
- USA
| |
Collapse
|
12
|
Xing Y, Jindal AK, Regueiro-Figueroa M, Le Fur M, Kervarec N, Zhao P, Kovacs Z, Valencia L, Pérez-Lourido P, Tripier R, Esteban-Gómez D, Platas-Iglesias C, Sherry AD. The Relationship between NMR Chemical Shifts of Thermally Polarized and Hyperpolarized 89 Y Complexes and Their Solution Structures. Chemistry 2016; 22:16657-16667. [PMID: 27723138 DOI: 10.1002/chem.201602901] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Indexed: 01/13/2023]
Abstract
Recently developed dynamic nuclear polarization (DNP) technology offers the potential of increasing the NMR sensitivity of even rare nuclei for biological imaging applications. Hyperpolarized 89 Y is an ideal candidate because of its narrow NMR linewidth, favorable spin quantum number (I=1/2 ), and long longitudinal relaxation times (T1 ). Strong NMR signals were detected in hyperpolarized 89 Y samples of a variety of yttrium complexes. A dataset of 89 Y NMR data composed of 23 complexes with polyaminocarboxylate ligands was obtained using hyperpolarized 89 Y measurements or 1 H,89 Y-HMQC spectroscopy. These data were used to derive an empirical equation that describes the correlation between the 89 Y chemical shift and the chemical structure of the complexes. This empirical correlation serves as a guide for the design of 89 Y sensors. Relativistic (DKH2) DFT calculations were found to predict the experimental 89 Y chemical shifts to a rather good accuracy.
Collapse
Affiliation(s)
- Yixun Xing
- Department of Chemistry, University of Texas, Dallas, 800 West Campbell Road, Richardson, Texas, 75080, USA
| | - Ashish K Jindal
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5325 Harry Hines Boulevard, Dallas, Texas, 75390, USA
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA) y Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Mariane Le Fur
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238, Brest Cedex 3, France
| | - Nelly Kervarec
- Plateforme de RMN-RPE, Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238, Brest Cedex 3, France
| | - Piyu Zhao
- Department of Chemistry, University of Texas, Dallas, 800 West Campbell Road, Richardson, Texas, 75080, USA
| | - Zoltan Kovacs
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5325 Harry Hines Boulevard, Dallas, Texas, 75390, USA
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310, Pontevedra, Spain
| | - Paulo Pérez-Lourido
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310, Pontevedra, Spain
| | - Raphaël Tripier
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238, Brest Cedex 3, France
| | - David Esteban-Gómez
- Centro de Investigaciones Científicas Avanzadas (CICA) y Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) y Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain.
| | - A Dean Sherry
- Department of Chemistry, University of Texas, Dallas, 800 West Campbell Road, Richardson, Texas, 75080, USA. .,Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5325 Harry Hines Boulevard, Dallas, Texas, 75390, USA.
| |
Collapse
|
13
|
Duignan TJ, Autschbach J. Impact of the Kohn–Sham Delocalization Error on the 4f Shell Localization and Population in Lanthanide Complexes. J Chem Theory Comput 2016; 12:3109-21. [DOI: 10.1021/acs.jctc.6b00238] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas J. Duignan
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| |
Collapse
|
14
|
Mirzaeva IV, Mainichev DA, Kozlova SG. A Localized Molecular Orbital Study of the Halogen Substitution Effect on (103)Rh NMR Shielding in [Cp*RhX2]2, Where X = Cl, Br, or I. J Phys Chem A 2016; 120:1944-9. [PMID: 26927955 DOI: 10.1021/acs.jpca.6b00882] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(103)Rh NMR parameters and the bonding structure of three complexes of [Cp*RhX2]2, where X = Cl, Br, or I, have been studied with the help of natural bond orbitals (NBOs) and natural localized molecular orbitals (NLMOs). The complexes of [Cp*RhX2]2, where X = Cl, Br, or I, have similar bonding structures, with the major difference being in the degree of covalency of the Rh-X bonds. The decomposition of (103)Rh NMR shielding into diamagnetic, paramagnetic, and spin-orbit terms shows that normal halogen dependence (NHD) of the (103)Rh NMR shift is defined mostly by the paramagnetic term, with the spin-orbit term being significantly smaller. The decomposition of (103)Rh shielding into spin-free NBO and NLMO contributions shows that (103)Rh shielding is dominated by Rh d-orbital deshielding contributions. We explain the NHD of the (103)Rh NMR shift with the increase in the energies of the virtual antibonding Rh-X orbitals along the X = Cl, Br, and I series.
Collapse
Affiliation(s)
- Irina V Mirzaeva
- Nikolaev Institute of Inorganic Chemistry SB RAS , Lavrentiev Ave., 3, Novosibirsk, 630090 Russia
| | - Dmitry A Mainichev
- Nikolaev Institute of Inorganic Chemistry SB RAS , Lavrentiev Ave., 3, Novosibirsk, 630090 Russia
| | - Svetlana G Kozlova
- Nikolaev Institute of Inorganic Chemistry SB RAS , Lavrentiev Ave., 3, Novosibirsk, 630090 Russia
| |
Collapse
|
15
|
Lummiss JAM, Perras FA, McDonald R, Bryce DL, Fogg DE. Sterically Driven Olefin Metathesis: The Impact of Alkylidene Substitution on Catalyst Activity. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00984] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Justin A. M. Lummiss
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| | - Frédéric A. Perras
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| | - Robert McDonald
- X-ray
Crystallographic Laboratory, Department of Chemistry, University of Alberta, Edmonton, AB, Canada, T6G 2G2
| | - David L. Bryce
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| | - Deryn E. Fogg
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| |
Collapse
|
16
|
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.
Collapse
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
| |
Collapse
|
17
|
Autschbach J. Relativistic Effects on NMR Parameters. SCIENCE AND TECHNOLOGY OF ATOMIC, MOLECULAR, CONDENSED MATTER & BIOLOGICAL SYSTEMS 2013. [DOI: 10.1016/b978-0-444-59411-2.00004-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
18
|
Engesser TA, Hrobárik P, Trapp N, Eiden P, Scherer H, Kaupp M, Krossing I. [TeX3]+ Cations Stabilized by the Weakly Coordinating [Al(ORF)4]− Anion: FIR Spectra, Raman Spectra, and Evaluation of an Abnormal Halogen Dependence of the 125Te NMR Chemical Shifts. Chempluschem 2012. [DOI: 10.1002/cplu.201200025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
19
|
Charpentier T. The PAW/GIPAW approach for computing NMR parameters: a new dimension added to NMR study of solids. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2011; 40:1-20. [PMID: 21612895 DOI: 10.1016/j.ssnmr.2011.04.006] [Citation(s) in RCA: 235] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 04/24/2011] [Accepted: 04/25/2011] [Indexed: 05/18/2023]
Abstract
In 2001, Mauri and Pickard introduced the gauge including projected augmented wave (GIPAW) method that enabled for the first time the calculation of all-electron NMR parameters in solids, i.e. accounting for periodic boundary conditions. The GIPAW method roots in the plane wave pseudopotential formalism of the density functional theory (DFT), and avoids the use of the cluster approximation. This method has undoubtedly revitalized the interest in quantum chemical calculations in the solid-state NMR community. It has quickly evolved and improved so that the calculation of the key components of NMR interactions, namely the shielding and electric field gradient tensors, has now become a routine for most of the common nuclei studied in NMR. Availability of reliable implementations in several software packages (CASTEP, Quantum Espresso, PARATEC) make its usage more and more increasingly popular, maybe indispensable in near future for all material NMR studies. The majority of nuclei of the periodic table have already been investigated by GIPAW, and because of its high accuracy it is quickly becoming an essential tool for interpreting and understanding experimental NMR spectra, providing reliable assignments of the observed resonances to crystallographic sites or enabling a priori prediction of NMR data. The continuous increase of computing power makes ever larger (and thus more realistic) systems amenable to first-principles analysis. In the near future perspectives, as the incorporation of dynamical effects and/or disorder are still at their early developments, these areas will certainly be the prime target.
Collapse
Affiliation(s)
- Thibault Charpentier
- CEA, IRAMIS, SIS2M, Laboratoire de Structure et Dynamique par Résonance Magnétique, UMR CEA-CNRS 3299, F-91191 Gif-sur-Yvette cedex, France.
| |
Collapse
|
20
|
Poblador-Bahamonde AI, Poteau R, Raynaud C, Eisenstein O. DFT calculations of 29Si-NMR chemical shifts in Ru(ii) silyl complexes: Searching for trends and accurate values. Dalton Trans 2011; 40:11321-6. [DOI: 10.1039/c1dt11135c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|