1
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Kovács B, Földes T, Szabó M, Dorkó É, Kótai B, Laczkó G, Holczbauer T, Domján A, Pápai I, Soós T. Illuminating the multiple Lewis acidity of triaryl-boranes via atropisomeric dative adducts. Chem Sci 2024:d4sc00925h. [PMID: 39257854 PMCID: PMC11382148 DOI: 10.1039/d4sc00925h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 08/23/2024] [Indexed: 09/12/2024] Open
Abstract
Using the principle that constrained conformational spaces can generate novel and hidden molecular properties, we challenged the commonly held perception that a single-centered Lewis acid reacting with a single-centered Lewis base always forms a single Lewis adduct. Accordingly, the emergence of single-centered but multiple Lewis acidity among sterically hindered and non-symmetric triaryl-boranes is reported. These Lewis acids feature several diastereotopic faces providing multiple binding sites at the same Lewis acid center in the interaction with Lewis bases giving rise to adducts with diastereomeric structures. We demonstrate that with a proper choice of the base, atropisomeric adduct species can be formed that interconvert via the dissociative mechanism rather than conformational isomerism. The existence of this exotic and peculiar molecular phenomenon was experimentally confirmed by the formation of atropisomeric piperidine-borane adducts using state-of-the-art NMR techniques in combination with computational methods.
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Affiliation(s)
- Benjámin Kovács
- Centre for Structural Science, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Tamás Földes
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Márk Szabó
- Centre for Structural Science, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Éva Dorkó
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Bianka Kótai
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Gergely Laczkó
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
- Hevesy György PhD School of Chemistry, Eötvös Loránd University P. O. Box 32 Budapest H-1518 Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Attila Domján
- Centre for Structural Science, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Imre Pápai
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
| | - Tibor Soós
- Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences Magyar tudósok körútja 2 H-1117 Budapest Hungary
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2
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Chaloupecká E, Kurfiřt M, Červenková Šťastná L, Karban J, Dračínský M. Exploring long-range fluorine-carbon J-coupling for conformational analysis of deoxyfluorinated disaccharides: A combined computational and NMR study. Bioorg Chem 2024; 147:107388. [PMID: 38678775 DOI: 10.1016/j.bioorg.2024.107388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 04/18/2024] [Accepted: 04/18/2024] [Indexed: 05/01/2024]
Abstract
In this study, we investigated the potential of long-range fluorine-carbon J-coupling for determining the structures of deoxyfluorinated disaccharides. Three disaccharides, previously synthesized as potential galectin inhibitors, exhibited through-space fluorine-carbon J-couplings. In our independent conformational analysis of these disaccharide derivatives, we employed a combination of density functional theory (DFT) calculations and nuclear magnetic resonance (NMR) experiments. By comparing the calculated nuclear shieldings with the experimental carbon chemical shifts, we were able to identify the most probable conformers for each compound. A model comprising fluoromethane and methane molecules was used to study the relationship between molecular arrangements and intermolecular through-space J-coupling. Our study demonstrates the important effect of internuclear distance and molecular orientation on the magnitude of fluorine-carbon coupling. The experimental values for the fluorine-carbon through-space couplings (TSCs) of the disaccharides corresponded with values calculated for the most probable conformers identified by the conformational analysis. These results unlock the broader application of fluorine-carbon TSCs as powerful tools for conformational analysis of flexible molecules, offering valuable insights for future structural investigations.
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Affiliation(s)
- Ema Chaloupecká
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, 160 00 Prague, Czech Republic; Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Martin Kurfiřt
- Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 1/135, 165 00 Prague 6, Czech Republic; University of Chemistry and Technology, Technická 3, 166 28 Prague 6, Czech Republic
| | - Lucie Červenková Šťastná
- Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 1/135, 165 00 Prague 6, Czech Republic
| | - Jindřich Karban
- Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojová 1/135, 165 00 Prague 6, Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, 160 00 Prague, Czech Republic.
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3
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Bao W, Gu G, Wu J, Gu YC, Zhao Y. Detection and Identification of Nitrile Compounds via Recognition-Enabled Chromatographic 19F NMR. Anal Chem 2024; 96:4463-4468. [PMID: 38462969 DOI: 10.1021/acs.analchem.3c04909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
The surge in applications of nitrile compounds across diverse fields, such as pharmaceuticals, agrochemicals, dyes, and functional materials, necessitates the development of rapid and efficient detection and identification methods. In this study, we introduce a chemosensing strategy employing a novel 19F-labeled probe, facilitating swift and accurate analysis of a broad spectrum of nitrile-containing analytes. This approach leverages the reversible interaction between the 19F-labeled probe and the analytes to produce chromatogram-like outputs, ensuring the precise identification of various pharmaceuticals and pesticides within complex matrices. Additionally, this dynamic system offers a versatile platform to investigate through-space 19F-19F interactions, showcasing its potential for future applications in mechanistic studies.
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Affiliation(s)
- Wenjing Bao
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Guangxing Gu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Jian Wu
- Instrumental Analysis Center, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yu-Cheng Gu
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire RG42 6EY, U.K
| | - Yanchuan Zhao
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
- Instrumental Analysis Center, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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4
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Saielli G. Through-space scalar spin-spin coupling: from rigid intramolecular cases to short-lived van der Waals complexes. Chemphyschem 2024; 25:e202300963. [PMID: 38215244 DOI: 10.1002/cphc.202300963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/06/2024] [Accepted: 01/08/2024] [Indexed: 01/14/2024]
Abstract
We will discuss, with the help of few selected examples, how the concept of through-space scalar spin-spin coupling between non covalently bonded nuclei has evolved in recent years. We will first present systems where 'no covalent bond' actually means that the two atoms are separated by a large number of bonds; then we will see cases where it is referred to true van der Waals dimers, but with the two atoms somehow constrained in their positions; we will finish with the most recent examples of liquids and even gaseous mixtures with full translational degrees of freedom in a regime of intermolecular/interatomic fast exchange.
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Affiliation(s)
- Giacomo Saielli
- CNR Institute on Membrane Technology, Unit of Padova, Via Marzolo, 1, 35131, Padova, Italy
- Department of Chemical Sciences, University of Padova, Via Marzolo, 1, 35131, Padova, Italy
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5
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Tong G, Griffin S, Sader A, Crowell AB, Beavers K, Watson J, Buchan Z, Chen S, Shenvi RA. C5 methylation confers accessibility, stability and selectivity to picrotoxinin. Nat Commun 2023; 14:8308. [PMID: 38097583 PMCID: PMC10721898 DOI: 10.1038/s41467-023-44030-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 11/28/2023] [Indexed: 12/17/2023] Open
Abstract
Minor changes to complex structures can exert major influences on synthesis strategy and functional properties. Here we explore two parallel series of picrotoxinin (PXN, 1) analogs and identify leads with selectivity between mammalian and insect ion channels. These are the first SAR studies of PXN despite its >100-year history and are made possible by advances in total synthesis. We observe a remarkable stabilizing effect of a C5 methyl, which completely blocks C15 alcoholysis via destabilization of an intermediate twist-boat conformer; suppression of this secondary hydrolysis pathway increases half-life in plasma. C5 methylation also decreases potency against vertebrate ion channels (γ-Aminobutyric acid type A (GABAA) receptors) but maintains or increases antagonism of homologous invertebrate GABA-gated chloride channels (resistance to dieldrin (RDL) receptors). Optimal 5MePXN analogs appear to change the PXN binding pose within GABAARs by disruption of a hydrogen bond network. These discoveries were made possible by the lower synthetic burden of 5MePXN (2) and were illuminated by the parallel analog series, which allowed characterization of the role of the synthetically simplifying C5 methyl in channel selectivity. These are the first SAR studies to identify changes to PXN that increase the GABAA-RDL selectivity index.
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Affiliation(s)
- Guanghu Tong
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, USA
| | - Samantha Griffin
- Corteva Agriscience, 9330 Zionsville Road, Indianapolis, Indiana, 46268, USA
| | - Avery Sader
- Corteva Agriscience, 9330 Zionsville Road, Indianapolis, Indiana, 46268, USA
| | - Anna B Crowell
- Department of Chemistry and Biochemistry, Oberlin College, 119 Woodland Street, Oberlin, Ohio, 44074, USA
| | - Ken Beavers
- Corteva Agriscience, 9330 Zionsville Road, Indianapolis, Indiana, 46268, USA
| | - Jerry Watson
- Corteva Agriscience, 9330 Zionsville Road, Indianapolis, Indiana, 46268, USA
| | - Zachary Buchan
- Corteva Agriscience, 9330 Zionsville Road, Indianapolis, Indiana, 46268, USA
| | - Shuming Chen
- Department of Chemistry and Biochemistry, Oberlin College, 119 Woodland Street, Oberlin, Ohio, 44074, USA.
| | - Ryan A Shenvi
- Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California, 92037, USA.
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6
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Weiss R, Aubert E, Groslambert L, Pale P, Mamane V. Evidence for and evaluation of fluorine-tellurium chalcogen bonding. Chem Sci 2023; 14:7221-7229. [PMID: 37416727 PMCID: PMC10321537 DOI: 10.1039/d3sc00849e] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 06/03/2023] [Indexed: 07/08/2023] Open
Abstract
In the field of noncovalent interactions, chalcogen bonding (ChB) involving the tellurium atom is currently attracting much attention in supramolecular chemistry and in catalysis. However, as a prerequisite for its application, the ChB should be studied in solution to assess its formation and, if possible, to evaluate its strength. In this context, new tellurium derivatives bearing CH2F and CF3 groups were designed to exhibit Te⋯F ChB and were synthesized in good to high yields. In both types of compounds, Te⋯F interactions were characterized in solution by combining 19F, 125Te and HOESY NMR techniques. These Te⋯F ChBs were shown to contribute to the overall JTe-F coupling constants (94-170 Hz) measured in the CH2F- and CF3-based tellurium derivatives. Finally, a variable temperature NMR study allowed us to approximate the energy of the Te⋯F ChB, from 3 kJ mol-1 for the compounds with weak Te σ-holes to 11 kJ mol-1 for Te σ-holes activated by the presence of strong electron withdrawing substituents.
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Affiliation(s)
- Robin Weiss
- LASYROC, UMR 7177, University of Strasbourg 1 Rue Blaise Pascal 67000 Strasbourg France
| | | | - Loic Groslambert
- LASYROC, UMR 7177, University of Strasbourg 1 Rue Blaise Pascal 67000 Strasbourg France
| | - Patrick Pale
- LASYROC, UMR 7177, University of Strasbourg 1 Rue Blaise Pascal 67000 Strasbourg France
| | - Victor Mamane
- LASYROC, UMR 7177, University of Strasbourg 1 Rue Blaise Pascal 67000 Strasbourg France
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7
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Race JJ, Webb MJ, Boyd TM, Weller AS. Ortho‐F,F‐DPEphos: Synthesis and Coordination Chemistry in Rhodium and Gold Complexes, and Comparison with DPEphos. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- James J. Race
- University of York Department of Chemistry YO10 5DD York UNITED KINGDOM
| | | | | | - Andrew S. Weller
- University of York Chemistry Heslington YO105DD York UNITED KINGDOM
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8
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Soares JV, Dal Poggetto G, Viesser RV, Couto UR, Tormena CF. Stereoelectronic interactions: A booster for 4 J HF transmission. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:481-488. [PMID: 35023222 DOI: 10.1002/mrc.5248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/04/2022] [Accepted: 01/10/2022] [Indexed: 05/21/2023]
Abstract
Long-range proton-fluorine coupling constants (n JHF ) are helpful for the structure elucidation of fluorinated molecules. However, their magnitude and sign can change with the relative position of coupled nuclei and the presence of substituents. Here, trans-4-tert-butyl-2-fluorocyclohexanone was used as a model compound for the study of the transmission of 4 JHF . In this compound, the 4 JH6axF was measured to be +5.1 Hz, which is five times larger than the remaining 4 JHF in the same molecule (4 JH4F = +1.0 Hz and 4 JH6eqF = +1.0 Hz). Through a combination of experimental data, natural bond orbital (NBO) and natural J-coupling (NJC) analyses, we observed that stereoelectronic interactions involving the π system of the carbonyl group are involved in the transmission pathway for the 4 JH6axF . Interactions containing the π system as an electron acceptor (e.g., σC6H6ax → π*C═O and σCF → π*C═O ) increase the value of the 4 JH6axF , while the interaction of the π system as an electron donor (e.g., πC═O → σ*CF ) decreases it. Additionally, the carbonyl group was shown not to be part of the transmission pathway of the diequatorial 4 JH6eqF coupling in cis-4-tert-butyl-2-fluorocyclohexanone, revealing that there is a crucial symmetry requirement that must be fulfilled for the π system to influence the value of the 4 JHF in these systems.
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Affiliation(s)
- João Vitor Soares
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, Brazil
| | | | - Renan V Viesser
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, Brazil
| | - Uenifer R Couto
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, Brazil
| | - Cláudio F Tormena
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, Brazil
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9
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Orton HW, Qianzhu H, Abdelkader EH, Habel EI, Tan YJ, Frkic RL, Jackson CJ, Huber T, Otting G. Through-Space Scalar 19F- 19F Couplings between Fluorinated Noncanonical Amino Acids for the Detection of Specific Contacts in Proteins. J Am Chem Soc 2021; 143:19587-19598. [PMID: 34780162 DOI: 10.1021/jacs.1c10104] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorine atoms are known to display scalar 19F-19F couplings in nuclear magnetic resonance (NMR) spectra when they are sufficiently close in space for nonbonding orbitals to overlap. We show that fluorinated noncanonical amino acids positioned in the hydrophobic core or on the surface of a protein can be linked by scalar through-space 19F-19F (TSJFF) couplings even if the 19F spins are in the time average separated by more than the van der Waals distance. Using two different aromatic amino acids featuring CF3 groups, O-trifluoromethyl-tyrosine and 4-trifluoromethyl-phenylalanine, we show that 19F-19F TOCSY experiments are sufficiently sensitive to detect TSJFF couplings between 2.5 and 5 Hz in the 19 kDa protein PpiB measured on a two-channel 400 MHz NMR spectrometer with a regular room temperature probe. A quantitative J evolution experiment enables the measurement of TSJFF coupling constants that are up to five times smaller than the 19F NMR line width. In addition, a new aminoacyl-tRNA synthetase was identified for genetic encoding of N6-(trifluoroacetyl)-l-lysine (TFA-Lys) and 19F-19F TOCSY peaks were observed between two TFA-Lys residues incorporated into the proteins AncCDT-1 and mRFP despite high solvent exposure and flexibility of the TFA-Lys side chains. With the ready availability of systems for site-specific incorporation of fluorinated amino acids into proteins by genetic encoding, 19F-19F interactions offer a straightforward way to probe the spatial proximity of selected sites without any assignments of 1H NMR resonances.
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Affiliation(s)
- Henry W Orton
- ARC Centre of Excellence for Innovations in Peptide & Protein Science, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Haocheng Qianzhu
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Elwy H Abdelkader
- ARC Centre of Excellence for Innovations in Peptide & Protein Science, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Edan I Habel
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Yi Jiun Tan
- ARC Centre of Excellence for Innovations in Peptide & Protein Science, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Rebecca L Frkic
- ARC Centre of Excellence for Innovations in Peptide & Protein Science, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Colin J Jackson
- ARC Centre of Excellence for Innovations in Peptide & Protein Science, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Thomas Huber
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Gottfried Otting
- ARC Centre of Excellence for Innovations in Peptide & Protein Science, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
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10
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Nguyen TA, Penouilh MJ, Cattey H, Pirio N, Fleurat-Lessard P, Hierso JC, Roger J. Unsymmetrically Substituted Bis(phosphino)Ferrocenes Triggering Through-Space 31(P, P′)-Nuclear Spin Couplings and Encapsulating Coinage Metal Cations. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Tuan-Anh Nguyen
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
| | - Marie-José Penouilh
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
| | - Hélène Cattey
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
| | - Nadine Pirio
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
| | - Paul Fleurat-Lessard
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
| | - Jean-Cyrille Hierso
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
| | - Julien Roger
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB - UMR CNRS 6302), Université Bourgogne−Franche-Comté (UBFC), 9 avenue Alain Savary, 21078 Dijon Cedex, France
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11
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Bunchuay T, Docker A, White NG, Beer PD. A new halogen bonding 1,2-iodo-triazolium-triazole benzene motif for anion recognition. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115482] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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13
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Edgar M, Hayward D, Zeinali F, Riaz S, Weaver GW. NMR spectral analysis of strongly second-order 6-, 8-, 9- and 10- spin-systems ( 1 H─ 19 F, 19 F─ 19 F, and 13 C─ 19 F) in perfluorotoluyl- and tetrafluoro-pyridyl-aromatics using the lineshape method ANATOLIA. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:170-185. [PMID: 31660627 DOI: 10.1002/mrc.4947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 09/23/2019] [Accepted: 09/23/2019] [Indexed: 06/10/2023]
Abstract
A simple to use nuclear magnetic resonance analysis method has been tested on complex 1 H, 19 F, and 13 C multiplets. This open-source line-shape analysis method analysis of total lineshape (ANATOLIA)1 provides some significant advantages over traditional assign-iterate methods of NMR spectral analysis by avoiding false minima and progressing optimisation to the global minimum. The target molecules are 1-perfluorotol-4-yl-2-perfluorotol-4-yl-oxymethyl-1H-benzimidazole (molecule-I) and 1-tetrafluoropyrid-4-yl-2-tetrafluoropyrid-4-yl-thio-1H-benzimidazole (molecule-II) which were produced as part of a family of fluorinated drug scaffolds prepared for anticancer and antiparasitic screening. Spectra display significant second-order effects with 1 H Δδ = 3.68 and 4.67 Hz for the aromatic hydrogen "triplets", with 19 F 4 JAA' , 4 JBB' , 4 JXX' , and 4 JYY' coupling constants range from +4.8 to -14.0 Hz and for 13 C-isotopomers 19 F Δδ of up to 111.56 Hz. A spin-system of six coupling nuclei (Ha Hb Hc Hd FY FY' ) was analysed in 12 s, a spin-system of nine coupling fluorine nuclei (AA'BB'CCC-YY') was analysed within 2 min, and 10 coupling nuclei (XX'YY'ZZZ-BB'-Hd ) was optimised in 6 min using a laptop computer. ANATOLIA was also robust enough to be able to yield accurate spectral values from inaccurate input values. In both compounds, a fluorine-fluorine coupling constant was identified between the two fluoro-aromatic rings (FBB' and FYY' ) of +4.05 and +4.67 Hz and attributed to a through-space interaction. Ab initio structure optimisations and coupling constant calculations provided useful input data for spectral analysis. A modern 19 F nuclear magnetic resonance spectrum of perfluorotoluene (octafluorotoluene) and analysis from 1975 was used as a test data set to assess ANATOLIA.
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Affiliation(s)
- Mark Edgar
- Department of Chemistry, School of Science, Loughborough University, Loughborough, UK
| | - Dee Hayward
- Department of Chemistry, School of Science, Loughborough University, Loughborough, UK
| | - Fatemeh Zeinali
- Department of Chemistry, School of Science, Loughborough University, Loughborough, UK
| | - Shahzad Riaz
- Department of Chemistry, School of Science, Loughborough University, Loughborough, UK
| | - George W Weaver
- Department of Chemistry, School of Science, Loughborough University, Loughborough, UK
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14
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Castro KP, Bukovsky EV, Kuvychko IV, DeWeerd NJ, Chen Y, Deng SHM, Wang X, Popov AA, Strauss SH, Boltalina OV. PAH/PAH(CF 3 ) n Donor/Acceptor Charge-Transfer Complexes in Solution and in Solid-State Co-Crystals. Chemistry 2019; 25:13547-13565. [PMID: 31381207 PMCID: PMC6916568 DOI: 10.1002/chem.201902712] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Indexed: 11/16/2022]
Abstract
A solution, solid-state, and computational study is reported of polycyclic aromatic hydrocarbon PAH/PAH(CF3 )n donor/acceptor (D/A) charge-transfer complexes that involve six PAH(CF3 )n acceptors with known gas-phase electron affinities that range from 2.11(2) to 2.805(15) eV and four PAH donors, including seven CT co-crystal X-ray structures that exhibit hexagonal arrays of mixed π-stacks with 1/1, 1/2, or 2/1 D/A stoichiometries (PAH=anthracene, azulene, coronene, perylene, pyrene, triphenylene; n=5, 6). These are the first D/A CT complexes with PAH(CF3 )n acceptors to be studied in detail. The nine D/A combinations were chosen to allow several structural and electronic comparisons to be made, providing new insights about controlling D/A interactions and the structures of CT co-crystals. The comparisons include, among others, CT complexes of the same PAH(CF3 )n acceptor with four PAH donors and CT complexes of the same donor with four PAH(CF3 )n acceptors. All nine CT complexes exhibit charge-transfer bands in solution with λmax between 467 and 600 nm. A plot of E(λmax ) versus [IE(donor)-EA(acceptor)] for the nine CT complexes studied is linear with a slope of 0.72±0.03 eV eV-1 . This plot is the first of its kind for CT complexes with structurally related donors and acceptors for which precise experimental gas-phase IEs and EAs are known. It demonstrates that conclusions based on the common assumption that the slope of a CT E(λmax ) versus [IE-EA] plot is unity may be incorrect in at least some cases and should be reconsidered.
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Affiliation(s)
- Karlee P. Castro
- Department of ChemistryColorado State UniversityFort CollinsCO80523USA
| | - Eric V. Bukovsky
- Department of ChemistryColorado State UniversityFort CollinsCO80523USA
| | - Igor V. Kuvychko
- Department of ChemistryColorado State UniversityFort CollinsCO80523USA
| | | | - Yu‐Sheng Chen
- ChemMatCARSUniversity of Chicago, Advanced Photon SourceArgonneIL 60439USA
| | - Shihu H. M. Deng
- Physical Sciences DivisionPacific Northwest National Laboratory, MS K8 88P.O. Box 999RichlandWashington99352USA
| | - Xue‐Bin Wang
- Physical Sciences DivisionPacific Northwest National Laboratory, MS K8 88P.O. Box 999RichlandWashington99352USA
| | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials ResearchDresden01069Germany
| | - Steven H. Strauss
- Department of ChemistryColorado State UniversityFort CollinsCO80523USA
| | - Olga V. Boltalina
- Department of ChemistryColorado State UniversityFort CollinsCO80523USA
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15
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Lino JBDR, Ramalho TC. Exploring Through-Space Spin-Spin Couplings for Quantum Information Processing: Facing the Challenge of Coherence Time and Control Quantum States. J Phys Chem A 2019; 123:1372-1379. [PMID: 30673241 DOI: 10.1021/acs.jpca.8b09425] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nuclear magnetic resonance (NMR) is a powerful tool for studying quantum information processing (QIP). Recently quantum technologies have been proposed to overcome the challenges in large-scale NMR QIP. Furthermore, computational chemistry can promote its improvement. Nuclear spins-1/2 are natural qubits and have been used in most NMR quantum computation experiments. However, molecules that enable many qubits NMR QIP implementations should meet some requirements regarding their spectroscopic properties. Exceptionally large through-space (TS) P-P spin-spin coupling constants (SSCC or J) observed in 1,8-diphosphanaphthalenes (PPN) and in naphtho[1,8- cd]-1,2-dithiole phenylphosphines (NTP) were proposed and investigated to provide more accurate control within large-scale NMR QIP. Spectroscopic properties of PPN and NTP derivatives were explored by theoretical strategies using locally dense basis sets (LDBS). 31P chemical shifts (δ) calculated at the B3LYP/aug-cc-pVTZ-J level and TS P-P SSCCs at the PBE1PBE/pcJ-2 (LDBS-1) level are very close to the experimental data for the PPN molecule. Differently, for the NTP dimer, PBE1PBE/pcJ-2 (LDBS-2) predicts more accurate 31P δ, whereas PBE1PBE/Def2-TZVP (LDBS-1) forecasts more accurate TS P-P SSCCs. From our results, PPNo-F, PPNo-ethyl, and PPNo-NH2 were the best candidates for NMR QIP, in which the large TS SSCCS could face the need of long-time quantum gates implementations. Therefore, it could overcome natural limitations concerning the development of large-scale NMR.
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Affiliation(s)
| | - Teodorico Castro Ramalho
- Chemistry Department , Federal University of Lavras , 37200-000 Lavras , MG Brazil.,Center for Basic and Applied Research, Faculty of Informatics and Management , University Hradec Kralove , 50003 Hradec Kralove , Czech Republic
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16
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Silva-Nigenda E, Martínez-Gómez A, Cruz-de la Cruz J, Barroso-Flores J, González-Romero C, Fuentes-Benites A, Jankowski CK, Cuevas-Yáñez E, Díaz-Torres E, Corona-Becerril D. Long range 1H19F coupling through multiple bond in thienopyridines, isoquinolines and 2-aza-carbazoles derivatives. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.08.084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Peez T, Luy JN, Harms K, Tonner R, Koert U. From Acenaphthenes to (+)-Delavatine A: Visible-Light-Induced Ring Closure of Methyl (α-Naphthyl) Acrylates. Chemistry 2018; 24:17686-17690. [DOI: 10.1002/chem.201804735] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Theodor Peez
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein Straße 4 35032 Marburg Germany
| | - Jan-Niclas Luy
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein Straße 4 35032 Marburg Germany
| | - Klaus Harms
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein Straße 4 35032 Marburg Germany
| | - Ralf Tonner
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein Straße 4 35032 Marburg Germany
| | - Ulrich Koert
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein Straße 4 35032 Marburg Germany
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18
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Dračínský M, Buchta M, Buděšínský M, Vacek-Chocholoušová J, Stará IG, Starý I, Malkina OL. Dihydrogen contacts observed by through-space indirect NMR coupling. Chem Sci 2018; 9:7437-7446. [PMID: 30319744 PMCID: PMC6180313 DOI: 10.1039/c8sc02859a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 08/11/2018] [Indexed: 11/21/2022] Open
Abstract
"Through-space" indirect spin-spin couplings between hydrogen atoms formally separated by up to 18 covalent bonds have been detected by NMR experiments in model helical molecules. It is demonstrated that this coupling can provide crucial structural information on the molecular conformation in solution. The coupling pathways have been visualised and analysed by computational methods. The conformational dependence of the coupling is explained in terms of orbital interactions.
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Affiliation(s)
- Martin Dračínský
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Flemingovo nám. 2 , 166 10 Prague 6 , Czech Republic .
| | - Michal Buchta
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Flemingovo nám. 2 , 166 10 Prague 6 , Czech Republic .
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Flemingovo nám. 2 , 166 10 Prague 6 , Czech Republic .
| | - Jana Vacek-Chocholoušová
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Flemingovo nám. 2 , 166 10 Prague 6 , Czech Republic .
| | - Irena G Stará
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Flemingovo nám. 2 , 166 10 Prague 6 , Czech Republic .
| | - Ivo Starý
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Flemingovo nám. 2 , 166 10 Prague 6 , Czech Republic .
| | - Olga L Malkina
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , Dúbravská cesta 9 , SK-84536 Bratislava , Slovakia .
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19
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Brittain WJ, Rastogi SK, Rogers RA, Rinaldi P. Phenyl rotation barrier in
Z
‐azobenzene: A physical organic problem in honor of
J.D.R.. J PHYS ORG CHEM 2018. [DOI: 10.1002/poc.3847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- William J. Brittain
- Department of Chemistry and Biochemistry Texas State University San Marcos TX USA
| | - Shiva K. Rastogi
- Department of Chemistry and Biochemistry Texas State University San Marcos TX USA
| | - Robert A. Rogers
- Department of Chemistry and Biochemistry Texas State University San Marcos TX USA
| | - Peter Rinaldi
- Department of Chemistry The University of Akron Akron OH USA
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20
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Chalmers BA, Nejman PS, Llewellyn AV, Felaar AM, Griffiths BL, Portman EI, Gordon EJL, Fan KJH, Woollins JD, Bühl M, Malkina OL, Cordes DB, Slawin AMZ, Kilian P. A Study of Through-Space and Through-Bond J PP Coupling in a Rigid Nonsymmetrical Bis(phosphine) and Its Metal Complexes. Inorg Chem 2018. [PMID: 29517228 DOI: 10.1021/acs.inorgchem.8b00162] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of representative late d-block metal complexes bearing a rigid bis(phosphine) ligand, iPr2P-Ace-PPh2 (L, Ace = acenaphthene-5,6-diyl), was prepared and fully characterized by various techniques, including multinuclear NMR and single-crystal X-ray diffraction. The heteroleptic nature of the peri-substituted ligand L allows for the direct observation of the JPP couplings in the 31P{1H} NMR spectra. Magnitudes of JPP are correlated with the identity and geometry of the metal and the distortions of the ligand L. The forced overlap of the phosphine lone pairs due to the constraints imposed by the rigid acenaphthene skeleton in L results in a large 4 JPP of 180 Hz. Sequestration of the lone pairs, either via oxidation of the phosphine or via metal chelation, results in distinct changes in the magnitude of JPP. For tetrahedral d10 complexes ([LMCl2], M = Zn, Cd, Hg), the JPP is comparable to or larger than (193-309 Hz) that in free ligand L, although the P···P separation in these complexes is increased by ca. 0.4 Å (compare to free ligand L). The magnitude of JPP diminishes to 26-117 Hz in square planar d8 complexes ([LMX2], M = Ni, Pd, Pt; X = Cl, Br) and the octahedral Mo0 complex ([LMo(CO)4], 33 Hz). Coupling deformation density calculations indicate the through-space interaction dominates in free L, while in metal complexes the main coupling pathway is via the metal atom.
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Affiliation(s)
- Brian A Chalmers
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Phillip S Nejman
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Alice V Llewellyn
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Adrian M Felaar
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Ben L Griffiths
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Eden I Portman
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Emma-Jane L Gordon
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Kenny J H Fan
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - J Derek Woollins
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - M Bühl
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Olga L Malkina
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , Dúbravská cesta 9 , 84 536 Bratislava , Slovakia
| | - David B Cordes
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Alexandra M Z Slawin
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Petr Kilian
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
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21
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Zhang C, Luo Q, Cheng S, Bu Y. Unusual Indirect Nuclear Spin-Spin Exchange Coupling through Solvated Electron. J Phys Chem Lett 2018; 9:689-695. [PMID: 29369635 DOI: 10.1021/acs.jpclett.7b03249] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Solvated electrons have been found to exist in various media which also exhibit more intriguing properties such as superconductivity, nonlinear optical response, and so on. However, how they affect the nuclear spin properties has not been proven. In this work, we present the first detailed study on solvated-electron-triggered indirect nuclear spin-spin J-coupling using density functional theory calculations. Taking 19F as a probe, we verify the presence of unusual J couplings between two distant F atoms in HF-containing anionic clusters. These couplings occur "through solvated electron", rather than through conventional covalent bonds or space. Solvated electron can serve as an additional channel to efficiently realize long-range J-coupling between far separated nuclei because of its dispersivity and Rydberg character. The coupling magnitude strongly depends on the unique distribution of solvated electron and its second-order interaction with solvating HF units. This work provides novel insights into the mediating roles of electrons, possibly opening up potential applications based on weakly bound electrons.
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Affiliation(s)
- Changzhe Zhang
- School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, People's Republic of China
| | - Qi Luo
- School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, People's Republic of China
| | - Shibo Cheng
- School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, People's Republic of China
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, People's Republic of China
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22
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Fluorine NMR spectroscopy and computational calculations for assessing intramolecular hydrogen bond involving fluorine and for characterizing the dynamic of a fluorinated molecule. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2017.07.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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23
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Hayashi S, Nishide T, Nakanishi W, Saito M. Relativistic Effect on 1 J(M,C) in Me 4 M, Me 3 M - , Ph 4 M, and Ph 3 M - (M=Pb, Sn, Ge, Si, and/or C): Role of s-Type Lone Pair Orbitals in the Distinct Effect for the Anionic Species. Chemphyschem 2017; 18:2466-2474. [PMID: 28691742 DOI: 10.1002/cphc.201700755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Indexed: 11/12/2022]
Abstract
Indirect one-bond nuclear spin-spin couplings between M and C [1 J(M,C)] in Me4 M, Me3 M- , Ph4 M, and Ph3 M- (M=Pb, Sn, Ge, Si, C) are analyzed with consideration of the relativistic effect and by employing Slater-type basis sets. The evaluated total values 1 JTL (M,C) reproduced the observed values with some systematic calculation errors. Fermi contact terms 1 JFC (M,C) contribute predominantly to 1 JTL (M,C) (≈99 %). A distinct relativistic effect on 1 J(Pb,C) is predicted for Me3 Pb- and Ph3 Pb- . The mechanisms for the distinct effect are elucidated by using the comparison between Me3 Pb- and Me4 Pb as an example. The contributions to 1 JFC (M,C) [or 1 JSD+FC (M,C), where SD denotes the spin-dipolar term] are decomposed into those of occupied orbitals and occupied-to-unoccupied transitions. The s-type lone-pair orbitals are demonstrated to contribute to the distinct relativistic effect on 1 J(Pb,C) of Me3 Pb- (and Ph3 Pb- ). The results are in sharp contrast to the cases of 1 J(M,C) for M atoms lighter than Pb, such as Si, and are explained by the s character of the M-C bonds. This treatment enables visualization and clear recognition the origin of the nuclear couplings for the species exhibiting a relativistic effect.
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Affiliation(s)
- Satoko Hayashi
- Department of Material Science and Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama, 640-8510, Japan
| | - Taro Nishide
- Department of Material Science and Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama, 640-8510, Japan
| | - Waro Nakanishi
- Department of Material Science and Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama, 640-8510, Japan
| | - Masaichi Saito
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo, Sakura-ku, Saitama-city, Saitama, 338-8570, Japan
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24
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Zong J, Mague JT, Pascal RA. Encapsulation of non-hydrogen atoms by in,in-bis(triarylelement)-containing cyclophanes. Tetrahedron 2017. [DOI: 10.1016/j.tet.2016.12.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Viesser RV, Ducati LC, Autschbach J, Tormena CF. NMR spin-spin coupling constants: bond angle dependence of the sign and magnitude of the vicinal (3)JHF coupling. Phys Chem Chem Phys 2016; 18:24119-28. [PMID: 27526856 DOI: 10.1039/c6cp04853f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dependence of the magnitude and sign of (3)JHFF on the bond angle in fluoro-cycloalkene compounds is evaluated by electronic structure calculations using different levels of theory, viz. DFT, SOPPA(CCSD) and SOPPA(CC2). Localized molecular orbital contributions to (3)JHFF are analyzed to assess which orbitals are responsible for (3)JHFF and which are the most important coupling transmission mechanisms for each compound. Fluoro-ethylene is used as a model system to evaluate the dependence of the (3)JHFF coupling constant on the angle between the σCα-F and σCα'-HF vectors. Through-space and hyperconjugative transmission pathways and ring strain are identified as responsible for the opposite trend between (3)JHFF and bond angle, and for the negative signs obtained for the two molecules, respectively. One of the fluorine lone pairs, σCα'-HF, σCα-F, σCα'-Cβ' bonding orbitals and the σ*Cα-F antibonding orbital are involved in the J-coupling pathways, according to analyses of pairwise-steric and hyperconjugative energies.
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Affiliation(s)
- Renan V Viesser
- Institute of Chemistry, University of Campinas - UNICAMP, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
| | - Lucas C Ducati
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo, SP, Brazil.
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, USA.
| | - Cláudio F Tormena
- Institute of Chemistry, University of Campinas - UNICAMP, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
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26
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Baumgarth H, Meier G, Braun T, Braun‐Cula B. Rhodium and Iridium Fluorido and Bifluorido Complexes Derived from Peroxido Precursors. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600682] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hanna Baumgarth
- Humboldt‐Universität zu BerlinDepartment of ChemistryBrook‐Taylor‐Straße 212489BerlinGermany
| | - Gregor Meier
- Humboldt‐Universität zu BerlinDepartment of ChemistryBrook‐Taylor‐Straße 212489BerlinGermany
| | - Thomas Braun
- Humboldt‐Universität zu BerlinDepartment of ChemistryBrook‐Taylor‐Straße 212489BerlinGermany
| | - Beatrice Braun‐Cula
- Humboldt‐Universität zu BerlinDepartment of ChemistryBrook‐Taylor‐Straße 212489BerlinGermany
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27
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Arras J, Eichele K, Maryasin B, Schubert H, Ochsenfeld C, Wesemann L. Intermolecular 119Sn,31P Through-Space Spin–Spin Coupling in a Solid Bivalent Tin Phosphido Complex. Inorg Chem 2016; 55:4669-75. [DOI: 10.1021/acs.inorgchem.6b00573] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Janet Arras
- Institut
für Anorganische Chemie, Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
- Theoretische
Chemie, University of Munich (LMU Munich), Butenandtstraße 7, 81377 Munich, Germany
| | - Klaus Eichele
- Institut
für Anorganische Chemie, Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
| | - Boris Maryasin
- Theoretische
Chemie, University of Munich (LMU Munich), Butenandtstraße 7, 81377 Munich, Germany
| | - Hartmut Schubert
- Institut
für Anorganische Chemie, Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
| | - Christian Ochsenfeld
- Theoretische
Chemie, University of Munich (LMU Munich), Butenandtstraße 7, 81377 Munich, Germany
| | - Lars Wesemann
- Institut
für Anorganische Chemie, Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
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28
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Rastogi SK, Rogers RA, Shi J, Brown CT, Salinas C, Martin KM, Armitage J, Dorsey C, Chun G, Rinaldi P, Brittain WJ. Through-space (19)F-(19)F spin-spin coupling in ortho-fluoro Z-azobenzene. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:126-131. [PMID: 26332615 DOI: 10.1002/mrc.4327] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 07/22/2015] [Accepted: 07/30/2015] [Indexed: 06/05/2023]
Abstract
We report through-space (TS) (19)F-(19)F coupling for ortho-fluoro-substituted Z-azobenzenes. The magnitude of the TS-coupling constant ((TS) JFF ) ranged from 2.2-5.9 Hz. Using empirical formulas reported in the literature, these coupling constants correspond to non-bonded F-F distances (dFF) of 3.0-3.5 Å. These non-bonded distances are significantly smaller than those determined by X-ray crystallography or density functional theory, which argues that simple models of (19)F-(19)F TS spin-spin coupling solely based dFF are not applicable. (1)H, (13)C and (19)F data are reported for both the E and Z isomers of ten fluorinated azobenzenes. Density functional theory [B3YLP/6-311++G(d,p)] was used to calculate (19) F chemical shifts, and the calculated values deviated 0.3-10.0 ppm compared with experimental values.
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Affiliation(s)
- Shiva K Rastogi
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Robert A Rogers
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Justin Shi
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Christopher T Brown
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Cindy Salinas
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Katherine M Martin
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Jacob Armitage
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Christopher Dorsey
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Gao Chun
- Department of Chemistry, The University of Akron, Akron, OH, 44325, United States
| | - Peter Rinaldi
- Department of Chemistry, The University of Akron, Akron, OH, 44325, United States
| | - William J Brittain
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
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29
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Abraham RJ, Cooper MA. A re-investigation of 4JFF and 5JFF nuclear spin–spin couplings in substituted benzenes, a novel conformational tool. Phys Chem Chem Phys 2016; 18:15822-7. [DOI: 10.1039/c6cp01975g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The FF couplings in fluorobenzenes are separated into their σ and π components and this provides a novel method of determining the conformation of the C-1 substituent in 2,6-difluorobenzenes.
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Affiliation(s)
| | - M. Ashley Cooper
- Department of Chemistry
- The University of Liverpool
- Liverpool L69 7ZD
- UK
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30
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Rastogi SK, Rogers RA, Shi J, Gao C, Rinaldi PL, Brittain WJ. Conformational Dynamics of o-Fluoro-Substituted Z-Azobenzene. J Org Chem 2015; 80:11485-90. [PMID: 26505924 DOI: 10.1021/acs.joc.5b02202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A conformational analysis of o-fluoro Z-azobenzene reveals a slight preference for aromatic C-F/π interaction. Density functional theory (DFT) indicates that the conformation with a C-F/π interaction is preferred by approximately 0.3-0.5 kcal/mol. Ground-state conformations were corroborated with X-ray crystallography. (Z)-Azobenzene (Z-AB) with at least one o-fluoro per ring displays (19)F-(19)F through-space (TS) coupling. 2D J-resolved NMR was used to distinguish through-bond from TS coupling ((TS)JFF). (TS)JFF decreases as the temperature is lowered and the multiplets coalesce into broad singlets. We hypothesize that the coalescence temperature (Tc) corresponds to the barrier for phenyl rotation. The experimentally determined barrier of 8-10 kcal/mol has been qualitatively verified by DFT where transition states with a bisected geometry were identified with zero-point energies of 6-9 kcal/mol relative to ground state. These values are significantly higher that values estimated from previous theoretical studies but lie within a reasonable range for phenyl rotation in hydrocarbon systems.
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Affiliation(s)
- S K Rastogi
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
| | - R A Rogers
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
| | - J Shi
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
| | - C Gao
- Department of Chemistry, The University of Akron , Akron, Ohio 44325, United States
| | - P L Rinaldi
- Department of Chemistry, The University of Akron , Akron, Ohio 44325, United States
| | - W J Brittain
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
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31
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Chalmers BA, Bühl M, Athukorala Arachchige KS, Slawin AMZ, Kilian P. Structural, Spectroscopic and Computational Examination of the Dative Interaction in Constrained Phosphine-Stibines and Phosphine-Stiboranes. Chemistry 2015; 21:7520-31. [DOI: 10.1002/chem.201500281] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Indexed: 11/06/2022]
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32
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Diamond LM, Knight FR, Cordes DB, Ward AC, Slawin AM, Woollins JD. Acenaphtho[5,6-cd]-1,2-dichalcogenoles and their platinum complexes. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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Knight FR, Diamond LM, Arachchige KSA, Sanz Camacho P, Randall RAM, Ashbrook SE, Bühl M, Slawin AMZ, Woollins JD. Conformational Dependence of Through-Space Tellurium-Tellurium Spin-Spin Coupling inPeri-Substituted Bis(Tellurides). Chemistry 2014; 21:3613-27. [DOI: 10.1002/chem.201405599] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Indexed: 11/06/2022]
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34
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Contreras RH, Llorente T, Ducati LC, Tormena CF. Revisiting NMR Through-Space JFF Spin–Spin Coupling Constants for Getting Insight into Proximate F---F Interactions. J Phys Chem A 2014; 118:5068-75. [DOI: 10.1021/jp501929t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rubén H. Contreras
- Department
of Physics, FCEyN, University of Buenos Aires and IFIBA-CONICET, C1053ABJ Buenos Aires, Argentina
| | - Tomás Llorente
- Department
of Physics, FCEyN, University of Buenos Aires and IFIBA-CONICET, C1053ABJ Buenos Aires, Argentina
| | - Lucas Colucci Ducati
- Institute
of Chemistry, University of Sao Paulo − USP, P.O. Box 26077, 05513-970 Sao Paulo - SP, Brazil
| | - Cláudio Francisco Tormena
- Chemistry
Institute, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970 Campinas - SP, Brazil
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35
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Wiegand T, Lüdeker D, Brunklaus G, Bussmann K, Kehr G, Erker G, Eckert H. Polymorphism in P,P-[3]ferrocenophanes: insights from an NMR crystallographic approach. Dalton Trans 2014; 43:12639-47. [PMID: 25010526 DOI: 10.1039/c4dt01071j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Thomas Wiegand
- Institut für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany.
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36
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Athukorala Arachchige KS, Sanz Camacho P, Ray MJ, Chalmers BA, Knight FR, Ashbrook SE, Bühl M, Kilian P, Slawin AMZ, Woollins JD. Sterically Restricted Tin Phosphines, Stabilized by Weak Intramolecular Donor–Acceptor Interactions. Organometallics 2014. [DOI: 10.1021/om500289b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
| | - Paula Sanz Camacho
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Matthew J. Ray
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Brian A. Chalmers
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Fergus R. Knight
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Sharon E. Ashbrook
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Michael Bühl
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Petr Kilian
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | | | - J. Derek Woollins
- EaSTCHEM,
School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
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37
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Wiegand T, Eckert H, Ren J, Brunklaus G, Fröhlich R, Daniliuc CG, Lübbe G, Bussmann K, Kehr G, Erker G, Grimme S. Indirect “No-Bond” 31P···31P Spin–Spin Couplings in P,P-[3]Ferrocenophanes: Insights from Solid-State NMR Spectroscopy and DFT Calculations. J Phys Chem A 2014; 118:2316-31. [DOI: 10.1021/jp500172b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Thomas Wiegand
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Hellmut Eckert
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Jinjun Ren
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Gunther Brunklaus
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | | | - Gerrit Lübbe
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Kathrin Bussmann
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Stefan Grimme
- Mulliken
Center for Theoretical Chemistry, Institut für Physikalische
und Theoretische Chemie, Universität Bonn, Beringstrasse 4, D 53155 Bonn, Germany
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38
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Hierso JC. Indirect nonbonded nuclear spin-spin coupling: a guide for the recognition and understanding of "through-space" NMR J constants in small organic, organometallic, and coordination compounds. Chem Rev 2014; 114:4838-67. [PMID: 24533483 DOI: 10.1021/cr400330g] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jean-Cyrille Hierso
- Institut de Chimie Moléculaire (ICMUB, UMR-CNRS 6302), Université de Bourgogne and Institut Universitaire de France (IUF) , 9 Avenue Alain Savary, BP 47870 Dijon F-21078, France
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39
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Stanford MW, Knight FR, Athukorala Arachchige KS, Sanz Camacho P, Ashbrook SE, Bühl M, Slawin AMZ, Woollins JD. Probing interactions through space using spin–spin coupling. Dalton Trans 2014; 43:6548-60. [DOI: 10.1039/c4dt00408f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of eight 5-(TeAr)-6-(SePh)acenaphthenes (Ar = aryl) were prepared and structurally characterised by X-ray crystallography, solution and solid-state NMR spectroscopy and DFT/B3LYP calculations.
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Affiliation(s)
- Martin W. Stanford
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
| | - Fergus R. Knight
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
| | | | - Paula Sanz Camacho
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
| | - Sharon E. Ashbrook
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
| | - Michael Bühl
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
| | - Alexandra M. Z. Slawin
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
| | - J. Derek Woollins
- EaStCHEM School of Chemistry and Centre for Magnetic Resonance
- University of St Andrews
- St Andrews KY16 9ST, UK
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40
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Vulpetti A, Dalvit C. Design and generation of highly diverse fluorinated fragment libraries and their efficient screening with improved (19) F NMR methodology. ChemMedChem 2013; 8:2057-69. [PMID: 24127294 DOI: 10.1002/cmdc.201300351] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Indexed: 12/11/2022]
Abstract
Fragment screening performed with (19) F NMR spectroscopy is becoming increasingly popular in drug discovery projects. With this approach, libraries of fluorinated fragments are first screened using the direct-mode format of the assay. The choice of fluorinated motifs present in the library is fundamental in order to ensure a large coverage of chemical space and local environment of fluorine (LEF). Mono- and poly-fluorinated fragments to be included in the libraries for screening are selected from both in-house and commercial collections, and those that are ad hoc designed and synthesized. Additional fluorinated motifs to be included in the libraries derive from the fragmentation of compounds in development and launched on the market, and compounds contained in other databases (such as Integrity, PDB and ChEMBL). Complex mixtures of highly diverse fluorine motifs can be rapidly screened and deconvoluted in the same NMR tube with a novel on the fly combined procedure for the identification of the active molecule(s). Issues and problems encountered in the design, generation and screening of diverse fragment libraries of fluorinated compounds with (19) F NMR spectroscopy are analyzed and technical solutions are provided to overcome them. The versatile screening methodology described here can be efficiently applied in laboratories with limited NMR setup and could potentially lead to the increasing role of (19) F NMR in the hit identification and lead optimization phases of drug discovery projects.
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Affiliation(s)
- Anna Vulpetti
- Global Discovery Chemistry, Novartis Institutes for Biomedical Research, 4002 Basel (Switzerland).
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41
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Ashbrook SE, Dawson DM. Exploiting periodic first-principles calculations in NMR spectroscopy of disordered solids. Acc Chem Res 2013; 46:1964-74. [PMID: 23402741 DOI: 10.1021/ar300303w] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Much of the information contained within solid-state nuclear magnetic resonance (NMR) spectra remains unexploited because of the challenges in obtaining high-resolution spectra and the difficulty in assigning those spectra. Recent advances that enable researchers to accurately and efficiently determine NMR parameters in periodic systems have revolutionized the application of density functional theory (DFT) calculations in solid-state NMR spectroscopy. These advances are particularly useful for experimentalists. The use of first-principles calculations aids in both the interpretation and assignment of the complex spectral line shapes observed for solids. Furthermore, calculations provide a method for evaluating potential structural models against experimental data for materials with poorly characterized structures. Determining the structure of well-ordered, periodic crystalline solids can be straightforward using methods that exploit Bragg diffraction. However, the deviations from periodicity, such as compositional, positional, or temporal disorder, often produce the physical properties (such as ferroelectricity or ionic conductivity) that may be of commercial interest. With its sensitivity to the atomic-scale environment, NMR provides a potentially useful tool for studying disordered materials, and the combination of experiment with first-principles calculations offers a particularly attractive approach. In this Account, we discuss some of the issues associated with the practical implementation of first-principles calculations of NMR parameters in solids. We then use two key examples to illustrate the structural insights that researchers can obtain when applying such calculations to disordered inorganic materials. First, we describe an investigation of cation disorder in Y2Ti(2-x)Sn(x)O7 pyrochlore ceramics using (89)Y and (119)Sn NMR. Researchers have proposed that these materials could serve as host phases for the encapsulation of lanthanide- and actinide-bearing radioactive waste. In a second example, we discuss how (17)O NMR can be used to probe the dynamic disorder of H in hydroxyl-humite minerals (nMg2SiO4·Mg(OH)2), and how (19)F NMR can be used to understand F substitution in these systems. The combination of first-principles calculations and multinuclear NMR spectroscopy facilitates the investigation of local structure, disorder, and dynamics in solids. We expect that applications will undoubtedly become more widespread with further advances in computational and experimental methods. Insight into the atomic-scale environment is a crucial first step in understanding the structure-property relationships in solids, and it enables the efficient design of future materials for a range of end uses.
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Affiliation(s)
- Sharon E. Ashbrook
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, United Kingdom
| | - Daniel M. Dawson
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, United Kingdom
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42
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Busacca CA, Qu B, Grět N, Fandrick KR, Saha AK, Marsini M, Reeves D, Haddad N, Eriksson M, Wu JP, Grinberg N, Lee H, Li Z, Lu B, Chen D, Hong Y, Ma S, Senanayake CH. Tuning the Peri Effect for Enantioselectivity: Asymmetric Hydrogenation of Unfunctionalized Olefins with the BIPI Ligands. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201201104] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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43
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Bühl M, Knight FR, Křístková A, Malkin Ondík I, Malkina OL, Randall RAM, Slawin AMZ, Woollins JD. Weak Te,Te interactions through the looking glass of NMR spin-spin coupling. Angew Chem Int Ed Engl 2013; 52:2495-8. [PMID: 23345140 PMCID: PMC3625736 DOI: 10.1002/anie.201205998] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 11/14/2012] [Indexed: 11/18/2022]
Affiliation(s)
- Michael Bühl
- EaStCHEM School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, UK.
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44
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Bühl M, Knight FR, Křístková A, Malkin Ondík I, Malkina OL, Randall RAM, Slawin AMZ, Woollins JD. Weak Te,Te Interactions through the Looking Glass of NMR Spin-Spin Coupling. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201205998] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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45
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Zakrzewska A, Kolehmainen E, Valkonen A, Haapaniemi E, Rissanen K, Chęcińska L, Ośmiałowski B. Substituent effect in 2-benzoylmethylenequinoline difluoroborates exhibiting through-space couplings. Multinuclear magnetic resonance, X-ray diffraction, and computational study. J Phys Chem A 2012; 117:252-6. [PMID: 23252343 DOI: 10.1021/jp311072q] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The series of nine 2-benzoylmethylenequinoline difluoroborates have been synthesized and characterized by multinuclear magnetic resonance, X-ray diffraction (XRD), and computational methods. The through-space spin-spin couplings between (19)F and (1)H/(13)C nuclei have been observed in solution. The NMR chemical shifts have been correlated to the Hammett substituent constants. The crystal structures of six compounds have been solved by XRD. For two derivatives the X-ray wave function refinement was performed to evaluate the character of bonds in the NBF(2)O moiety by topological and integrated bond descriptors.
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Affiliation(s)
- Anna Zakrzewska
- Faculty of Technology and Chemical Engineering, University of Technology and Life Sciences, Seminaryjna 3, PL-85-326 Bydgoszcz, Poland
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46
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Arias A, Forniés J, Fortuño C, Martín A, Latronico M, Mastrorilli P, Todisco S, Gallo V. Formation of P–C Bond through Reductive Coupling between Bridging Phosphido and Benzoquinolinate Groups. Isolation of Complexes of the Pt(II)/Pt(IV)/Pt(II) Sequence. Inorg Chem 2012; 51:12682-96. [DOI: 10.1021/ic301298p] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Andersson Arias
- Departamento de Química Inorgánica,
Instituto
de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza—C.S.I.C., E-50009 Zaragoza,
Spain
| | - Juan Forniés
- Departamento de Química Inorgánica,
Instituto
de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza—C.S.I.C., E-50009 Zaragoza,
Spain
| | - Consuelo Fortuño
- Departamento de Química Inorgánica,
Instituto
de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza—C.S.I.C., E-50009 Zaragoza,
Spain
| | - Antonio Martín
- Departamento de Química Inorgánica,
Instituto
de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza—C.S.I.C., E-50009 Zaragoza,
Spain
| | - Mario Latronico
- Dipartimento DICATECh del Politecnico di Bari and Istituto CNR-ICCOM, Via Orabona 4, I-70125
Bari, Italy
| | - Piero Mastrorilli
- Dipartimento DICATECh del Politecnico di Bari and Istituto CNR-ICCOM, Via Orabona 4, I-70125
Bari, Italy
| | - Stefano Todisco
- Dipartimento DICATECh del Politecnico di Bari and Istituto CNR-ICCOM, Via Orabona 4, I-70125
Bari, Italy
| | - Vito Gallo
- Dipartimento DICATECh del Politecnico di Bari and Istituto CNR-ICCOM, Via Orabona 4, I-70125
Bari, Italy
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47
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Bonhomme C, Gervais C, Babonneau F, Coelho C, Pourpoint F, Azaïs T, Ashbrook SE, Griffin JM, Yates JR, Mauri F, Pickard CJ. First-principles calculation of NMR parameters using the gauge including projector augmented wave method: a chemist's point of view. Chem Rev 2012; 112:5733-79. [PMID: 23113537 DOI: 10.1021/cr300108a] [Citation(s) in RCA: 318] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, Université Pierre et Marie Curie, CNRS UMR, Collège de France, France.
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48
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Dalvit C, Vulpetti A. Technical and practical aspects of (19) F NMR-based screening: toward sensitive high-throughput screening with rapid deconvolution. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2012; 50:592-597. [PMID: 22821476 DOI: 10.1002/mrc.3842] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 06/04/2012] [Accepted: 06/12/2012] [Indexed: 06/01/2023]
Abstract
The technical and practical aspects of (19) F NMR-based screening against a macromolecular target are analyzed in detail. A novel method utilizing the relaxation of (19) F homonuclear double quantum coherence is proposed for performing NMR-based binding assays in a direct- or competition-mode format. A combined strategy based on (19) F NMR chemical shift prediction, 2D (19) F NMR DOSY, and 2D (19) F-(1) H NMR long-range COSY experiments is presented for the deconvolution of complex mixtures of fluorinated molecules generated by either addition of single compounds or by chemical synthesis. The approaches presented here allow the screening of complex mixtures, even in the case where the exact composition is not known, and the rapid identification of the binders contained in the mixtures.
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Affiliation(s)
- Claudio Dalvit
- Department of Chemistry, University of Neuchâtel, CH 2000, Neuchâtel, Switzerland.
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49
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Ducati LC, Contreras RH, Tormena CF. Unexpected geometrical effects on paramagnetic spin-orbit and spin-dipolar 2J(FF) couplings. J Phys Chem A 2012; 116:4930-3. [PMID: 22533483 DOI: 10.1021/jp301912x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The second-rank tensor character of the paramagnetic spin-orbit and spin-dipolar contributions to nuclear spin-spin coupling constants is usually ignored when NMR measurements are carried out in the isotropic phase. However, in this study it is shown that isotropic (2)J(FF) couplings strongly depend on the relative orientation of the C-F bonds containing the coupling nuclei and the eigenvectors of such tensors. Predictions about such effect are obtained using a qualitative approach based on the polarization propagator formalism at the RPA, and results are corroborated performing high-level ab initio spin-spin coupling calculations at the SOPPA(CCSD)/EPR-III//MP2/EPR-III level in a model system. It is highlighted that no calculations at the RPA level were carried out in this work. The quite promising results reported in this paper suggest that similar properties are expected to hold for the second-rank nuclear magnetic shielding tensor.
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Affiliation(s)
- Lucas C Ducati
- Chemistry Institute, State University of Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil
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50
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Weberski MP, Chen C, Delferro M, Zuccaccia C, Macchioni A, Marks TJ. Suppression of β-Hydride Chain Transfer in Nickel(II)-Catalyzed Ethylene Polymerization via Weak Fluorocarbon Ligand–Product Interactions. Organometallics 2012. [DOI: 10.1021/om3002735] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Michael P. Weberski
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
| | - Changle Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
| | - Massimiliano Delferro
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
| | - Cristiano Zuccaccia
- Dipartimento di Chimica, Università degli Studi di Perugia, Via Elce di Sotto, 8-06123 Perugia,
Italy
| | - Alceo Macchioni
- Dipartimento di Chimica, Università degli Studi di Perugia, Via Elce di Sotto, 8-06123 Perugia,
Italy
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
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