1
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Tiddens MR, Kappé BT, Smak TJ, Lutz M, Moret ME. Coordination of a Phosphine-Tethered Aminoborane to Group 10 Metals. Chemistry 2024:e202400666. [PMID: 38577933 DOI: 10.1002/chem.202400666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 04/04/2024] [Accepted: 04/05/2024] [Indexed: 04/06/2024]
Abstract
While π-complexes of C=C bonds are ubiquitous in organometallic chemistry, analogous complexes of the isoelectronic but strongly polarized B=N double bond of aminoboranes are extremely scarce. To address this gap, a diphosphine-aminoborane ligand (PhDPBAiPr) is introduced and its coordination with group 10 metals is investigated. The B=N bond does not coordinate to the metal in Pt(0) and Pd(II) complexes. In contrast, side-on coordination of the B=N bond is observed in the Ni(0) complex (PhDPBAiPr)Ni(NCPh), and the X-ray crystal structure reveals B-N bond elongation compared to the free ligand. The choice of co-ligand strongly influences the presence or absence of side-on coordination at Ni(0) as evidenced by NMR spectroscopy. While the B=N π-complex is geometrically similar to C=C analogues, a bonding analysis reveals that the interaction of the B=N motif with the electron-rich Ni(0) center is best described as 3c4e hyperbond, in which Ni and N are competing for the empty orbital on B.
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Affiliation(s)
- Martine R Tiddens
- Organic Chemistry and Catalysis, Faculty of Science, Utrecht University, Institute for Sustainable and Circular Chemistry, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Bram T Kappé
- Organic Chemistry and Catalysis, Faculty of Science, Utrecht University, Institute for Sustainable and Circular Chemistry, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Tom J Smak
- Organic Chemistry and Catalysis, Faculty of Science, Utrecht University, Institute for Sustainable and Circular Chemistry, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Martin Lutz
- Structural Biochemistry, Faculty of Science, Utrecht University, Bijvoet Centre for Biomolecular Research, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
| | - Marc-Etienne Moret
- Organic Chemistry and Catalysis, Faculty of Science, Utrecht University, Institute for Sustainable and Circular Chemistry, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands
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2
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Zhang H, Wang Y, Lu Q, Song J, Duan Y, Zeng Y, Mo Y. Stretched Central Double Bonds in Dialumene and Disilene by Amino Substituents: A Case of Lone Pair Repulsion. Chemistry 2023; 29:e202301862. [PMID: 37506171 DOI: 10.1002/chem.202301862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/28/2023] [Accepted: 07/28/2023] [Indexed: 07/30/2023]
Abstract
There have been remarkable advances in the syntheses and applications of groups 13 and 14 homonuclear ethene analogues. However, successes are largely limited to aryl- and/or silyl-substituted species. Analogues bearing two or more heteroatoms are still scarce. In this work, the block-localized wavefunction (BLW) method at the density functional theory (DFT) level was employed to study dialumene and disilene bearing two amino substituents whose optimal geometries exhibit significantly stretched central M=M (M=Al or Si) double bonds compared with aryl- and/or silyl-substituted species. Computational analyses showed that the repulsion between the lone electron pairs of amino substituents and M=M π bond plays a critical role in the elongation of the M=M bonds. Evidently, replacing the substituent groups -NH2 with -BH2 can enhance the planarity and shorten the central double bonds due to the absence of lone pair electrons in BH2 .
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Affiliation(s)
- Huaiyu Zhang
- Institute of Computational Quantum Chemistry, and Hebei Key Laboratory of Inorganic Nano-materials, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China
| | - Yating Wang
- Institute of Computational Quantum Chemistry, and Hebei Key Laboratory of Inorganic Nano-materials, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China
| | - Qingrui Lu
- Institute of Computational Quantum Chemistry, and Hebei Key Laboratory of Inorganic Nano-materials, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China
| | - Jinshuai Song
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Yandong Duan
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, School of Sciences, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Yanli Zeng
- Institute of Computational Quantum Chemistry, and Hebei Key Laboratory of Inorganic Nano-materials, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China
| | - Yirong Mo
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, NC 27401, USA
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3
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Rather SA, Athimoolam S, Naveed Ahmed Q. Cesium‐Fluoride‐Promoted Synthesis of Stable Organocesium Reagents and Their Ambident Reactivities with Arynes. Chemistry 2022; 28:e202200822. [DOI: 10.1002/chem.202200822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Suhail A. Rather
- Natural Product and Medicinal Chemistry Division Indian Institute of Integrative Medicine (CSIR-IIIM) 180001 Canal Road, Jammu Jammu & Kashmir India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - S. Athimoolam
- Department of Physics University College of Engineering Nagercoil Anna University of Technology Tirunelveli Nagercoil 629004 India
| | - Qazi Naveed Ahmed
- Natural Product and Medicinal Chemistry Division Indian Institute of Integrative Medicine (CSIR-IIIM) 180001 Canal Road, Jammu Jammu & Kashmir India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
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4
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Zhao R, Sheng L, Gao K. Theoretical prediction of an NXeH4+ ion with N-Xe triple bond. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Marczenko KM, Jee S, Chitnis SS. High Lewis Acidity at Planar, Trivalent, and Neutral Bismuth Centers. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00378] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katherine M. Marczenko
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, Halifax, Nova Scotia B3H 4R2, Canada
| | - Samantha Jee
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, Halifax, Nova Scotia B3H 4R2, Canada
| | - Saurabh S. Chitnis
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, Halifax, Nova Scotia B3H 4R2, Canada
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6
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Lu Z, Quanz H, Ruhl J, Albrecht G, Logemann C, Schlettwein D, Schreiner PR, Wegner HA. Control of Excited-State Conformations in B,N-Acenes. Angew Chem Int Ed Engl 2019; 58:4259-4263. [PMID: 30657239 DOI: 10.1002/anie.201814104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Indexed: 11/07/2022]
Abstract
We present a new concept to control the conformations of molecules in the excited state through harvesting negative hyperconjugation. The strategy was realized with the 2,3,1,4-benzodiazadiborinane scaffold, which was prepared by a new synthetic procedure. Photochemical studies identified dual light emission, which was assigned to well-defined conformers. The emission at longer wavelength can be switched off by restricting the rotational degrees of freedom in the solid state as well as by controlling the energy levels of the excited states through adjusting the solvent polarity.
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Affiliation(s)
- Zhenpin Lu
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Henrik Quanz
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Julia Ruhl
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Georg Albrecht
- Institute of Applied Physics and Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Christian Logemann
- Institute of Inorganic Chemistry, Department of Chemistry, University of Cologne, Greinstr. 6, 50939, Köln, Germany
| | - Derck Schlettwein
- Institute of Applied Physics and Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Hermann A Wegner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
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7
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Lu Z, Quanz H, Ruhl J, Albrecht G, Logemann C, Schlettwein D, Schreiner PR, Wegner HA. Control of Excited‐State Conformations in B,N‐Acenes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814104] [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)
- Zhenpin Lu
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Henrik Quanz
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Julia Ruhl
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Georg Albrecht
- Institute of Applied Physics and Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Christian Logemann
- Institute of Inorganic ChemistryDepartment of ChemistryUniversity of Cologne Greinstr. 6 50939 Köln Germany
| | - Derck Schlettwein
- Institute of Applied Physics and Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Peter R. Schreiner
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Hermann A. Wegner
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
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8
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Beguerie M, Faradji C, Vendier L, Sabo-Etienne S, Alcaraz G. Ruthenium-Catalyzed Tandem Activation of C≡N and B−H Bonds under Dihydrogen: Synthesis of BN Heterocycles. ChemCatChem 2017. [DOI: 10.1002/cctc.201700682] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Marion Beguerie
- CNRS, LCC, Laboratoire de Chimie de Coordination and; Université de Toulouse, UPS, INPT; F-31077 Toulouse Cedex 4 France
| | - Charly Faradji
- CNRS, LCC, Laboratoire de Chimie de Coordination and; Université de Toulouse, UPS, INPT; F-31077 Toulouse Cedex 4 France
| | - Laure Vendier
- CNRS, LCC, Laboratoire de Chimie de Coordination and; Université de Toulouse, UPS, INPT; F-31077 Toulouse Cedex 4 France
| | - Sylviane Sabo-Etienne
- CNRS, LCC, Laboratoire de Chimie de Coordination and; Université de Toulouse, UPS, INPT; F-31077 Toulouse Cedex 4 France
| | - Gilles Alcaraz
- UMR 6226 CNRS; Université de Rennes 1; Institut des Sciences Chimiques de Rennes, Team “Organometallics:Materials and Catalysis”; Campus de Beaulieu 35042 Rennes, Cedex France
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9
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Drover MW, Bowes EG, Schafer LL, Love JA, Weller AS. Phosphoramidate-Supported Cp*IrIII
Aminoborane H2
B=NR2
Complexes: Synthesis, Structure, and Solution Dynamics. Chemistry 2016; 22:6793-7. [DOI: 10.1002/chem.201600951] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Marcus W. Drover
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Eric G. Bowes
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Laurel L. Schafer
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Jennifer A. Love
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Andrew S. Weller
- Department of Chemistry; The University of Oxford; Chemistry Research Laboratories; Oxford OX1 3TA UK
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10
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Altman AB, Pemmaraju CD, Camp C, Arnold J, Minasian SG, Prendergast D, Shuh DK, Tyliszczak T. Theory and X-ray Absorption Spectroscopy for Aluminum Coordination Complexes – Al K-Edge Studies of Charge and Bonding in (BDI)Al, (BDI)AlR2, and (BDI)AlX2 Complexes. J Am Chem Soc 2015; 137:10304-16. [PMID: 26258886 DOI: 10.1021/jacs.5b05854] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alison B. Altman
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | | | - Clément Camp
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - John Arnold
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
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11
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Stevens CJ, Dallanegra R, Chaplin AB, Weller AS, Macgregor SA, Ward B, McKay D, Alcaraz G, Sabo-Etienne S. [Ir(PCy3)2(H)2(H2BNMe2)]+ as a Latent Source of Aminoborane: Probing the Role of Metal in the Dehydrocoupling of H3B⋅NMe2H and Retrodimerisation of [H2BNMe2]2. Chemistry 2011; 17:3011-20. [DOI: 10.1002/chem.201002517] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 11/05/2010] [Indexed: 11/06/2022]
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12
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Wrackmeyer B, Molla E, Thoma P, Klimkina E, Tok O, Bauer T, Kempe R. N-Methyl-anilinoborane: Monomer, Dimers, Molecular Structure, and Rearrangement into μ-(N-Methyl-anilino)diborane(6). A Convenient Route to μ-(Amino)diboranes(6). Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201000420] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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13
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Fischer RC, Power PP. π-Bonding and the Lone Pair Effect in Multiple Bonds Involving Heavier Main Group Elements: Developments in the New Millennium. Chem Rev 2010; 110:3877-923. [DOI: 10.1021/cr100133q] [Citation(s) in RCA: 894] [Impact Index Per Article: 63.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Roland C. Fischer
- Technische Universität Graz, Stremayrgasse 16/IV, A-8010, Graz, Austria, and University of California, Department of Chemistry, One Shields Avenue, Davis, California 95616
| | - Philip P. Power
- Technische Universität Graz, Stremayrgasse 16/IV, A-8010, Graz, Austria, and University of California, Department of Chemistry, One Shields Avenue, Davis, California 95616
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14
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Wodrich MD, Vargas A, Morgantini PY, Merino G, Corminboeuf C. What governs nitrogen configuration in substituted aminophosphines? J PHYS ORG CHEM 2009. [DOI: 10.1002/poc.1431] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Rowley CN, Ong TG, Priem J, Woo TK, Richeson DS. Amidolithium and Amidoaluminum Catalyzed Synthesis of Substituted Guanidines: An Interplay of DFT Modeling and Experiment. Inorg Chem 2008; 47:9660-8. [DOI: 10.1021/ic801028m] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Christopher N. Rowley
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ontario, Canada, K1N 6N5
| | - Tiow-Gan Ong
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ontario, Canada, K1N 6N5
| | - Jessica Priem
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ontario, Canada, K1N 6N5
| | - Tom K. Woo
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ontario, Canada, K1N 6N5
| | - Darrin S. Richeson
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ontario, Canada, K1N 6N5
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16
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Richard RM, Ball DW. G2, G3, and complete basis set calculations of the thermodynamic properties of aminoborane, diaminoborane, and triaminoborane. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.08.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Gupta N, Shah KK, Garg R. Substituent-dependent anomeric effects as a source of conformational preference in pyridinium methylides. J Org Chem 2006; 71:1344-50. [PMID: 16468781 DOI: 10.1021/jo051852q] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A systematic density functional theory level investigation of differently substituted pyridinium methylides was carried out to determine the role of C(ylidic) lone-pair-associated hyperconjugative and negative hyperconjugative interactions in deciding conformational preferences. Deviation from the coplanar orientation of the carbanionic center with the pyridine ring and its substituent dependence has been found to correlate well with the relative opportunities for conjugative and negative hyperconjugative interactions of a ylidic moiety with different substituent groups present at the ylidic carbon. The contribution of individual n-->pi* conjugative, n-->sigma* negative hyperconjugative, and sigma-->pi* hyperconjugative interactions in a particular conformation of pyridinium dichlorophosphinomethylides was assessed from donor-acceptor stabilization energies, as obtained from natural bond orbital (NBO) analysis. The relative extent of conjugative and negative hyperconjugative interactions with the substituents present at the ylidic carbon plays an important role in permitting the delocalization of ylidic charge into the pyridine ring, thereby controlling the relative orientation of the latter with the carbanionic plane.
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Affiliation(s)
- Neelima Gupta
- Department of Chemistry, University of Rajasthan, Jaipur-302 004, India.
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18
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Chaplin AB, Harrison JA, Dyson PJ. Revisiting the Electronic Structure of Phosphazenes. Inorg Chem 2005; 44:8407-17. [PMID: 16270979 DOI: 10.1021/ic0511266] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Natural bond orbital (NBO) and topological electron density analyses have been used to investigate the electronic structure of phosphazenes [N3P3R6] (R = H, F, Cl, Br, CH3, CF3, N(C2H4); 2R = O2C6H4), [N4P4Cl8], and H[NPCl2]4H. Using the former, the two most likely phosphazene bonding alternatives, negative hyperconjugation and ionic bonding have been critically evaluated. Ionic bonding, as suggested by topological analysis, was found to be the dominant bonding feature, although contributions from negative hyperconjugation are necessary for a more complete bonding description. Substituent effects on the P-N bond have been assessed and cases of bond length alternation have been rationalized using this combined bonding model, which supersedes previous models involving d-orbital participation, leading to an explanation for the observed bond length alternation found in some linear polyphosphazenes. In addition, common aromaticity indicators, nucleus independent chemical shifts (NICS) and para-delocalization indices (PDI), have been determined for the cyclophosphazenes.
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Affiliation(s)
- Adrian B Chaplin
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
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19
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Østby KA, Haaland A, Gundersen G, Nöth H. Two-Center, Three-Center, and Four-Center Dative π-Bonding Systems in Boron−Nitrogen Compounds Studied by Density Functional Theory Calculations: The Molecular Structures of Bis(dimethylboryl)amine, Bis(dimethylboryl)methylamine and Bis(dimethylamino)methylborane Determined by Gas Electron Diffraction. Organometallics 2005. [DOI: 10.1021/om050476x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kari-Anne Østby
- Department of Chemistry, University of Oslo, Box 1033 Blindern, N-0315 Oslo, Norway
| | - Arne Haaland
- Department of Chemistry, University of Oslo, Box 1033 Blindern, N-0315 Oslo, Norway
| | - Grete Gundersen
- Department of Chemistry, University of Oslo, Box 1033 Blindern, N-0315 Oslo, Norway
| | - Heinrich Nöth
- Institute of Inorganic Chemistry, Ludwig-Maximillians-Universität München, Butenandtstrasse 7-13, Haus D, D-81377 München, Germany
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20
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Kenney AP, Yap GPA, Richeson DS, Barry ST. The Insertion of Carbodiimides into Al and Ga Amido Linkages. Guanidinates and Mixed Amido Guanidinates of Aluminum and Gallium. Inorg Chem 2005; 44:2926-33. [PMID: 15819580 DOI: 10.1021/ic048433g] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The insertion of carbodiimides into existing metal-heteroatom bonds is an important preparative route for the synthesis of useful ligand systems such as amidinates and guanidinates. Our interest lies in multiple insertions at one metal center and the mechanisms of insertion and rearrangement. We have synthesized and characterized [Me(2)NC(N(i)Pr)(2)](n)M(NMe(2))(3)(-)(n) (n = 1, 2, 3; M = Al, Ga). We have investigated the mechanism of synthesis and discovered a ligand transfer step that is important for the formation of the final products.
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Affiliation(s)
- Amanda P Kenney
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada
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21
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Rowley CN, DiLabio GA, Barry ST. Theoretical and Synthetic Investigations of Carbodiimide Insertions into Al−CH3 and Al−N(CH3)2 Bonds. Inorg Chem 2005; 44:1983-91. [PMID: 15762725 DOI: 10.1021/ic048501z] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Carbodiimides are known to insert into aluminum-carbon bonds to form four-membered bidentate amidinate chelate rings. Insertions into Al-R and Al-NR'2 (R, R' = alkyl) have been reported in the literature. We have devised a mechanism for these insertions and modeled it using density functional theory (DFT) calculations. The calculated barrier heights for competitive insertions show the insertion into Al-N(CH3)2 goes through a lower barrier than the reaction with Al-CH3 for diisopropyl carbodiimide due to the necessity of forming a pentavalent carbon intermediate in the Al-CH3 case. However, insertion into Al-CH3 has the lower barrier for the reaction with di-tert-butyl carbodiimide because of steric effects, which is consistent with the published experimental results. We have synthesized aluminum amidinates containing two and three acetamidinate rings via insertion of 2 and 3 equiv of diisopropylcarbodiimide into trimethylaluminum (TMA). The crystal structure for [CH3C(N(i)Pr)2]2 AlCH3 is reported. We have found that, although the first insertion is rapid at room temperature, the second and third insertions require refluxing above 70 degrees C. We have calculated the barrier heights for the first and second insertion and have found that this is due to a higher barrier for the migration of the methyl group in the second insertion. This higher barrier is the result of the lack of an exergic precoordination of the carbodiimide to the metal center, which facilitates the first insertion.
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Affiliation(s)
- Christopher N Rowley
- Department of Chemistry, Carleton University, Ottawa, 1125 Colonel By Drive, Ontario, Canada K1S 5B6
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Jacquemin D, Perpète EA, Wathelet V, André JM. Ab Initio Investigation of the Structures and Properties of Polyaminoborane. J Phys Chem A 2004. [DOI: 10.1021/jp0465027] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Denis Jacquemin
- Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, rue de Bruxelles, 61, B-5000 Namur, Belgium
| | - Eric A. Perpète
- Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, rue de Bruxelles, 61, B-5000 Namur, Belgium
| | - Valérie Wathelet
- Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, rue de Bruxelles, 61, B-5000 Namur, Belgium
| | - Jean-Marie André
- Laboratoire de Chimie Théorique Appliquée, Facultés Universitaires Notre-Dame de la Paix, rue de Bruxelles, 61, B-5000 Namur, Belgium
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