1
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Shirobokov OG, Kuzmina LG, Howard JA, Nikonov GI. Imido silyl complexes of molybdenum: synthesis, structure, and unusual H 2/silane exchange. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Reaction of complex (ArN)Mo(H)(Cl)(PMe3)3 (1) with BPh3 and silane H3SiPh affords a new silyl complex (ArN)Mo(SiH2Ph)(Cl)(PMe3)2 (3) that catalyses facile H–H/Si–H exchange. EXSY experiments suggest that this exchange does not involve the classical pathways such as oxidative addition of hydrogen or silane to the complex or σ-bond metathesis. It is suggested that the exchange may occur in an FLP cage comprised by the complex and the silane.
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Affiliation(s)
- Oleg G. Shirobokov
- Chemistry Department, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada
| | - Lyudmila G. Kuzmina
- N.S. Kurnakov Institute of General and Inorganic Chemistry, 31 Leninskii Prosp., Moscow 119991, Russia
| | - Judith A.K. Howard
- Chemistry Department, University of Durham, South Road, Durham DH1 3LE, UK
| | - Georgii I. Nikonov
- Chemistry Department, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada
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2
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Price JS, Emslie DJH, Berno B. Manganese Silyl Dihydride Complexes: A Spectroscopic, Crystallographic, and Computational Study of Nonclassical Silicate and Hydrosilane Hydride Isomers. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Kuboki M, Nomura K. (Arylimido)niobium(V) Complexes Containing 2-Pyridylmethylanilido Ligand as Catalyst Precursors for Ethylene Dimerization That Proceeds via Cationic Nb(V) Species. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masaharu Kuboki
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Kotohiro Nomura
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan
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4
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Srisupap N, Wised K, Tsutsumi K, Nomura K. Synthesis of (Arylmido)niobium(V) Complexes Containing Ketimide, Phenoxide Ligands, and Some Reactions with Phenols and Alcohols. ACS OMEGA 2018; 3:6166-6181. [PMID: 31458800 PMCID: PMC6644436 DOI: 10.1021/acsomega.8b01065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Accepted: 05/28/2018] [Indexed: 06/10/2023]
Abstract
Reactions of Nb(NAr)(N=C t Bu2)3 (3a, Ar = 2,6-Me2C6H3) with 1.0, 2.0, or 3.0 equiv of Ar'OH (Ar' = 2,6- i Pr2C6H3) afforded Nb(NAr)(N=C t Bu2)2(OAr'), Nb(NAr)(N=C t Bu2)(OAr')2, or Nb(NAr)(OAr')3, respectively (at 25 °C), whereas the reaction with 2.0 equiv of 2,6- t Bu2C6H3OH afforded Nb(NAr)(N=C t Bu2)2(O-2,6- t Bu2C6H3) upon heating (70 °C) without the formation of bis(phenoxide) and the reaction of 3a with 2.0 equiv of 2,4,6-Me3C6H2OH afforded Nb(NAr)(N=C t Bu2)(O-2,4,6-Me3C6H2)2(HN=C t Bu2). Similar reactions of 3a with 1.0 equiv of (CF3)3COH or 2.0 equiv of (CF3)2CHOH afforded Nb(NAr)(N=C t Bu2)2[OC(CF3)3](HN=C t Bu2) or Nb(NAr)(N=C t Bu2)[OCH(CF3)2]2(HN=C t Bu2), respectively. On the basis of their structural analyses and the reaction chemistry, it was suggested that these reactions proceeded via coordination of phenol (alcohol) to Nb and the subsequent proton (hydrogen) transfer to the ketimide (N=C t Bu2) ligand. The reaction of Nb(NAr)(N=C t Bu2)2(OAr') with 1.0 equiv of 2,4,6-Me3C6H2OH gave the disproportionation products Nb(NAr)(N=C t Bu2)(OAr')2 and Nb(NAr)(N=C t Bu2)(O-2,4,6-Me3C6H2)2(HN=C t Bu2) with 1:1 ratio, clearly indicating the presence of the above mechanism and the fast equilibrium (between the ketimide and the phenoxide). The reaction of 3a with 1.0 or 2.0 equiv of C6F5OH afforded Nb(N=C t Bu2)2(OC6F5)3(HN=C t Bu2) as the sole isolated product, which was formed from once generated Nb(NAr)(N=C t Bu2)2(OC6F5)(HN=C t Bu2) by treating with C6F5OH.
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Affiliation(s)
- Natta Srisupap
- Department of Chemistry,
Faculty of Science, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Kritdikul Wised
- Department of Chemistry,
Faculty of Science, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Ken Tsutsumi
- Department of Chemistry,
Faculty of Science, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Kotohiro Nomura
- Department of Chemistry,
Faculty of Science, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan
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5
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Filippou AC, Hoffmann D, Schnakenburg G. Triple bonds of niobium with silicon, germaniun and tin: the tetrylidyne complexes [(κ 3-tmps)(CO) 2Nb[triple bond, length as m-dash]E-R] (E = Si, Ge, Sn; tmps = MeSi(CH 2PMe 2) 3; R = aryl). Chem Sci 2017; 8:6290-6299. [PMID: 29896377 PMCID: PMC5956830 DOI: 10.1039/c7sc02708g] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Accepted: 07/02/2017] [Indexed: 11/21/2022] Open
Abstract
A systematic, efficient approach to first complexes containing a triple bond between niobium and the elements silicon, germanium or tin is reported. The approach involves a metathetical exchange of the niobium-centered nucleophile (NMe4)[Nb(CO)4(κ2-tmps)] (1) (tmps = MeSi(CH2PMe2)3) with a suitable organotetrel(ii)halide. Compound 1 was obtained from (NMe4)[Nb(CO)6] and the triphosphane tmps by photodecarbonylation. Reaction of 1 with the disilene E-Tbb(Br)Si[double bond, length as m-dash]Si(Br)Tbb in the presence of 4-dimethylaminopyridine afforded selectively the red-brown silylidyne complex [(κ3-tmps)(CO)2Nb[triple bond, length as m-dash]Si-Tbb] (2-Si, Tbb = 4-tert-butyl-2,6-bis(bis(trimethylsilyl)methyl)phenyl). Similarly, treatment of 1 with E(ArMes)Cl (E = Ge, Sn; ArMes = 2,6-mesitylphenyl) afforded after elimination of (NMe4)Cl and two CO ligands the deep magenta colored germylidyne complex [(κ3-tmps)(CO)2Nb[triple bond, length as m-dash]Ge-ArMes] (3-Ge), and the deep violet, light-sensitive stannylidyne complex [(κ3-tmps)(CO)2Nb[triple bond, length as m-dash]Sn-ArMes] (3-Sn), respectively. Formation of 3-Sn proceeds via the niobiastannylene [(κ3-tmps)(CO)3Nb-SnArMes] (4-Sn), which was detected by IR and NMR spectroscopy. The niobium tetrylidyne complexes 2-Si, 3-Ge and 3-Sn were fully characterized and their solid-state structures determined by single-crystal X-ray diffraction studies. All complexes feature an almost linear tetrel coordination and the shortest Nb-E bond lengths (d(Nb-Si) = 232.7(2) pm; d(Nb-Ge) = 235.79(4) pm; d(Nb-Sn) = 253.3(1) pm) reported to date. Reaction of 3-Ge with a large excess of H2O afforded upon cleavage of the Nb-Ge triple bond the hydridogermanediol Ge(ArMes)H(OH)2. Photodecarbonylation of [CpNb(CO)4] (Cp = η5-C5H5) in the presence of Ge(ArMes)Cl afforded the red-orange chlorogermylidene complex [Cp(CO)3Nb[double bond, length as m-dash]Ge(ArMes)Cl] (5-Ge). The molecular structure of 5-Ge features an upright conformation of the germylidene ligand, a trigonal-planar coordinated Ge atom, and a Nb-Ge double bond length of 251.78(6) pm, which lies in-between the Nb-Ge triple bond length of 3-Ge (235.79(4) pm) and a Nb-Ge single bond length (267.3 pm). Cyclic voltammetric studies of 2-Si, 3-Ge, and 3-Sn reveal several electron-transfer steps. One-electron oxidation and reduction of the germylidyne complex of 3-Ge in THF are electrochemically reversible suggesting that both the radical cation and radical anion of 3-Ge are accessible species in solution.
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Affiliation(s)
- Alexander C Filippou
- Institut für Anorganische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany.
| | - David Hoffmann
- Institut für Anorganische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany.
| | - Gregor Schnakenburg
- Institut für Anorganische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany.
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6
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Mai VH, Kuzmina LG, Churakov AV, Korobkov I, Howard JAK, Nikonov GI. NHC carbene supported half-sandwich hydridosilyl complexes of ruthenium: the impact of supporting ligands on Si⋯H interligand interactions. Dalton Trans 2016; 45:208-15. [DOI: 10.1039/c5dt04067a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Electron donating NHC carbene ligand IPr exerts stronger RuH⋯Si interactions in complexes Cp(IPr)RuH2(SiR3) than in related iPr3P complexes Cp(iPr3P)RuH2(SiR3).
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Affiliation(s)
- Van Hung Mai
- Department of Chemistry
- Brock University
- 1812 Sir Isaac Brock Way
- Canada
| | | | | | - Ilia Korobkov
- X-Ray Core Facility
- Faculty of Science
- University of Ottawa
- Ottawa
- Canada K1N 6N5
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7
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Khalimon AY, Ignatov SK, Okhapkin AI, Simionescu R, Kuzmina LG, Howard JAK, Nikonov GI. Unusual structure, fluxionality, and reaction mechanism of carbonyl hydrosilylation by silyl hydride complex [(ArN=)Mo(H)(SiH2Ph)(PMe3)3]. Chemistry 2013; 19:8573-90. [PMID: 23671027 DOI: 10.1002/chem.201300376] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Indexed: 11/12/2022]
Abstract
The reactions of bis(borohydride) complexes [(RN=)Mo(BH4)2(PMe3)2] (4: R = 2,6-Me2C6H3; 5: R = 2,6-iPr2C6H3) with hydrosilanes afford new silyl hydride derivatives [(RN=)Mo(H)(SiR'3)(PMe3)3] (3: R = Ar, R'3 = H2Ph; 8: R = Ar', R'3 = H2Ph; 9: R = Ar, R'3 = (OEt)3; 10: R = Ar, R'3 = HMePh). These compounds can also be conveniently prepared by reacting [(RN=)Mo(H)(Cl)(PMe3)3] with one equivalent of LiBH4 in the presence of a silane. Complex 3 undergoes intramolecular and intermolecular phosphine exchange, as well as exchange between the silyl ligand and the free silane. Kinetic and DFT studies show that the intermolecular phosphine exchange occurs through the predissociation of a PMe3 group, which, surprisingly, is facilitated by the silane. The intramolecular exchange proceeds through a new non-Bailar-twist pathway. The silyl/silane exchange proceeds through an unusual Mo(VI) intermediate, [(ArN=)Mo(H)2(SiH2Ph)2(PMe3)2] (19). Complex 3 was found to be the catalyst of a variety of hydrosilylation reactions of carbonyl compounds (aldehydes and ketones) and nitriles, as well as of silane alcoholysis. Stoichiometric mechanistic studies of the hydrosilylation of acetone, supported by DFT calculations, suggest the operation of an unexpected mechanism, in that the silyl ligand of compound 3 plays an unusual role as a spectator ligand. The addition of acetone to compound 3 leads to the formation of [trans-(ArN)Mo(OiPr)(SiH2Ph)(PMe3)2] (18). This latter species does not undergo the elimination of a Si-O group (which corresponds to the conventional Ojima's mechanism of hydrosilylation). Rather, complex 18 undergoes unusual reversible β-CH activation of the isopropoxy ligand. In the hydrosilylation of benzaldehyde, the reaction proceeds through the formation of a new intermediate bis(benzaldehyde) adduct, [(ArN=)Mo(η(2)-PhC(O)H)2(PMe3)], which reacts further with hydrosilane through a η(1)-silane complex, as studied by DFT calculations.
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Affiliation(s)
- Andrey Y Khalimon
- Chemistry Department, Brock University, 500 Glenridge Avenue, St. Catharines, ON, L2S 3A1, Canada
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8
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Khalimon AY, Peterson E, Lorber C, Kuzmina LG, Howard JAK, van der Est A, Nikonov GI. Imido‐Supported Borohydrides of Titanium, Vanadium and Molybdenum. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201351] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Andrey Y. Khalimon
- Chemistry Department, Brock University, 500 Glenridge Ave., St. Catharines, ON, L2S 3A1, Canada, http://www.brocku.ca/mathematics‐science/departments‐and‐centres/chemistry/people/faculty/georgii‐i‐nikonov
| | - Erik Peterson
- Chemistry Department, Brock University, 500 Glenridge Ave., St. Catharines, ON, L2S 3A1, Canada, http://www.brocku.ca/mathematics‐science/departments‐and‐centres/chemistry/people/faculty/georgii‐i‐nikonov
| | - Christian Lorber
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, 31077 Toulouse Cedex 4, France
| | - Lyudmila G. Kuzmina
- N. S. Kurnakov Institute of General and Inorganic Chemistry, 31 Leninskii Prosp., Moscow 119991, Russia
| | | | - Art van der Est
- Chemistry Department, Brock University, 500 Glenridge Ave., St. Catharines, ON, L2S 3A1, Canada, http://www.brocku.ca/mathematics‐science/departments‐and‐centres/chemistry/people/faculty/georgii‐i‐nikonov
| | - Georgii I. Nikonov
- Chemistry Department, Brock University, 500 Glenridge Ave., St. Catharines, ON, L2S 3A1, Canada, http://www.brocku.ca/mathematics‐science/departments‐and‐centres/chemistry/people/faculty/georgii‐i‐nikonov
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9
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Corey JY. Reactions of hydrosilanes with transition metal complexes and characterization of the products. Chem Rev 2011; 111:863-1071. [PMID: 21250634 DOI: 10.1021/cr900359c] [Citation(s) in RCA: 353] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joyce Y Corey
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, 63121, USA.
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10
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Ray M, Nakao Y, Sato H, Sakaki S, Watanabe T, Hashimoto H, Tobita H. Experimental and Theoretical Study of a Tungsten Dihydride Silyl Complex: New Insight into Its Bonding Nature and Fluxional Behavior. Organometallics 2010. [DOI: 10.1021/om100653v] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Mausumi Ray
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Yoshihide Nakao
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | | | - Shigeyoshi Sakaki
- Institute for Integrated Cell-Material Sciences, Kyoto University, Ushinomiya-cho, Yoshida, Sakyo-ku Kyoto 606-8501, Japan
| | - Takahito Watanabe
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Hisako Hashimoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Hiromi Tobita
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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11
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Dannappel K, Nienhaus R, Schürmann M, Costisella B, Jurkschat K. The UV-Light Initiated Reaction of Organosilanes with Tungsten Hexacarbonyl: Formation of an Organosilylene Complex and Organosilylium Salts. Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200900204] [Citation(s) in RCA: 19] [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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12
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Ignatov SK, Khalimon AY, Rees NH, Razuvaev AG, Mountford P, Nikonov GI. β-Agostic Silylamido and Silyl-Hydrido Compounds of Molybdenum and Tungsten. Inorg Chem 2009; 48:9605-22. [DOI: 10.1021/ic900591e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stanislav K. Ignatov
- Department of Chemistry, Nizhnii Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russia
| | - Andrey Y. Khalimon
- Department of Chemistry, Brock University, St. Catharines, ON L2S 3A1, Canada
| | - Nicholas H. Rees
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Alexei G. Razuvaev
- Department of Chemistry, Nizhnii Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russia
| | - Philip Mountford
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Georgii I. Nikonov
- Department of Chemistry, Brock University, St. Catharines, ON L2S 3A1, Canada
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13
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Gutsulyak DV, Churakov AV, Kuzmina LG, Howard JAK, Nikonov GI. Steric and Electronic Effects in Half-Sandwich Ruthenium Silane σ-Complexes with Si−H and Si−Cl Interligand Interactions. Organometallics 2009. [DOI: 10.1021/om801192b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dmitry V. Gutsulyak
- Chemistry Department, Brock University, 500 Glenridge Avenue, St Catharines L2S 3A1, Ontario, Canada, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Andrei V. Churakov
- Chemistry Department, Brock University, 500 Glenridge Avenue, St Catharines L2S 3A1, Ontario, Canada, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Lyudmila G. Kuzmina
- Chemistry Department, Brock University, 500 Glenridge Avenue, St Catharines L2S 3A1, Ontario, Canada, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Judith A. K. Howard
- Chemistry Department, Brock University, 500 Glenridge Avenue, St Catharines L2S 3A1, Ontario, Canada, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Georgii I. Nikonov
- Chemistry Department, Brock University, 500 Glenridge Avenue, St Catharines L2S 3A1, Ontario, Canada, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
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Ignatov SK, Rees NH, Merkoulov AA, Dubberley SR, Razuvaev AG, Mountford P, Nikonov GI. Silyl Hydrides of Tantalum Supported by Cyclopentadienyl-imido Ligand Sets: Syntheses, X-ray, NMR, and DFT Studies. Organometallics 2008. [DOI: 10.1021/om800553y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stanislav K. Ignatov
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
| | - Nicholas H. Rees
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
| | - Alexei A. Merkoulov
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
| | - Stuart R. Dubberley
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
| | - Alexei G. Razuvaev
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
| | - Philip Mountford
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
| | - Georgii I. Nikonov
- Department of Chemistry, Nizhny Novgorod State University, Gagarin Avenue 23, 603600 Nizhny Novgorod, Russian Federation, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., Department of Chemistry, Moscow State University, Vorob’evy Gory, 119992, Moscow, Russian Federation, and Department of Chemistry, Brock University, Glenridge Avenue 500, St. Catharines, ON L2S 3A1, Canada
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15
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Khalimon AY, Holland JP, Kowalczyk RM, McInnes EJL, Green JC, Mountford P, Nikonov GI. Synthesis and Molecular and Electronic Structure of an Unusual Paramagnetic Borohydride Complex Mo(NAr)2(PMe3)2(η2-BH4). Inorg Chem 2008; 47:999-1006. [DOI: 10.1021/ic701826v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrey Y. Khalimon
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Jason P. Holland
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Radoslaw M. Kowalczyk
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Eric J. L. McInnes
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Jennifer C. Green
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Philip Mountford
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Georgii I. Nikonov
- Chemistry Department, Brock University, Glenridge Ave. 500, St Catharines, ON L2S3A1, Canada, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K., and EPSRC c. w. EPR Service Centre, School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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Gutsulyak DV, Osipov AL, Kuzmina LG, Howard JAK, Nikonov GI. Unexpected effect of the ring on the extent of Si⋯H interligand interactions in half-sandwich silyl hydrides of ruthenium. Dalton Trans 2008:6843-50. [DOI: 10.1039/b806447d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Ignatov SK, Rees NH, Merkoulov AA, Dubberley SR, Razuvaev AG, Mountford P, Nikonov GI. Non-Innocent Behaviour of Imido Ligands in the Reactions of Silanes with Half-Sandwich Imido Complexes of Nb and V: A Silane/Imido Coupling Route to Compounds with Nonclassical SiH Interactions. Chemistry 2007; 14:296-310. [PMID: 17899558 DOI: 10.1002/chem.200700271] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Reactions of imido complexes [M(Cp)(=NR')(PR''3)2] (M=V, Nb) with silanes afford a plethora of products, depending on the nature of the metal, substitution at silicon and nitrogen and the steric properties of the phosphine. The main products are [M(Cp)(=NR')(PR3)(H)(SiRnCl3-n)] (M=V, Nb; R'=2,6-diisopropylphenyl (Ar), 2,6-dimethylphenyl (Ar')), [Nb(Cp)(=NR')(PR''3)(H)(SiPhR2)] (R2=MeH, H2), [Nb(Cp)(==NR')(PR''3)(Cl)(SiHRnCl2-n)] and [Nb(Cp)(eta 3-N(R)SiR2--H...)(PR''3)(Cl)]. Complexes with the smaller Ar' substituent at nitrogen react faster, as do more acidic silanes. Bulkier groups at silicon and phosphorus slow down the reaction substantially. Kinetic NMR experiments supported by DFT calculations reveal an associative mechanism going via an intermediate N-silane adduct [Nb(Cp){=N(-->SiHClR2)R'}(PR''3)2] bearing a penta-coordinate silicon centre, which then rearranges into the final products through a Si--H or Si--Cl bond activation process. DFT calculations show that this imido-silane adduct is additionally stabilized by a Si--HM agostic interaction. Si--H activation is kinetically preferred even when Si--Cl activation affords thermodynamically more stable products. The niobium complexes [NbCp(=NAr)(PMe3)(H)(SiR2Cl)] (R=Ph, Cl) are classical according to X-ray studies, but DFT calculations suggest the presence of interligand hypervalent interactions (IHI) in the model complex [Nb(Cp) (==NMe)(PMe3)(H)(SiMe2Cl)]. The extent of Si--H activation in the beta-Si--HM agostic complexes [Cp{eta 3-N(R')SiR2--H}M(PR''3)(Cl)] (R''=PMe3, PMe2Ph) primarily depends on the identity of the ligand trans to the Si--H bond. A trans phosphine leads to a stronger Si--H bond, manifested by a larger J(Si--H) coupling constant. The Si--H activation diminishes slightly when a less basic phosphine is employed, consistent with decreased back-donation from the metal.
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Affiliation(s)
- Stanislav K Ignatov
- Department of Chemistry, University of Nizhny Novgorod, 23 Gagarin Avenue, Nizhny, Novgorod 603950, Russia
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18
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Khalimon AY, Dorogov KY, Churakov AV, Kuzmina LG, Lemenovskii DA, Howard JAK, Nikonov GI. Synthesis and structural studies of germyl and germyl/stannyl substituted tungstenocenes. Dalton Trans 2007:2440-9. [PMID: 17844666 DOI: 10.1039/b618806k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-pot reactions of [WCp2(H)2] and [WCp2(H)(SnMe3)] with "BuLi followed by an equivalent of GeMe2Cl2 afford mono(germyl) substituted tungstenocenes [WCp2(H)(GeMe2Cl)] (1) and [WCp2(SnMe3)(GeMe2Cl)] (7). Reactions of the products with tin halides in the presence NEt3 afford the mixed complexes [WCp2(SnR2X)(GeMe2Y)] (X, Y = Cl, Br, R = Me, Et), which were further converted to moderately stable compounds [WCp2(SnR2H)(GeMe2H)] (R = Me (10), Et (11)). A number of asymmetric mono(halo)-substituted germyl/stannyl tungstenocenes [WCp2(SnMe2X)(GeMe2H)] (X = Cl (12), Br (13)) and [WCp2(SnEt2Y)(GeMe2H)] (Y = Br (14), I (15)) were prepared by selective halogenation of the Sn-H bond in 10 and 11. X-Ray studies of [WCp2(H)(GeMe2Cl)] (1), [WCp2(SnEt2Br)(GeMe2Cl)] (4), and [WCp2(SnEt2Br)(GeMe2H)] (14) established classical structures of these compounds. X-Ray study of complex [WCp2(SnMeCl)(GeMe2Cl)] (3) revealed the presence of interligand Ge-Cl...Sn-Cl interactions in a highly Ge/Sn disordered structure. Analyses of molecular parameters of 1, 4, and 14 suggest the presence of a negative hyperconjugation between metal lone pairs and the sigma*-orbital of the E-X bond, which is stronger in bromo substituted complexes in comparison with chloro substituted ones.
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Affiliation(s)
- Andrey Yu Khalimon
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia
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20
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Dorogov KY, Yousufuddin M, Ho NN, Churakov AV, Kuzmina LG, Schultz AJ, Mason SA, Howard JAK, Lemenovskii DA, Bau R, Nikonov GI. Syntheses and Structures of Asymmetric Bis(silyl) Niobocene Hydrides. Inorg Chem 2006; 46:147-60. [PMID: 17198423 DOI: 10.1021/ic061314b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper deals with the preparation and structural investigation of asymmetric bis(silyl) niobocene hydrides, Cp2Nb(SiHMe2)(H)(SiXMe2) (2; X = F (a), Cl (b), Br (c), I (d)) and Cp2Nb(SiXMe2)(H)(SiYMe2) (X,Y= F-I; X not equal Y). Complexes 2a-d were prepared by selective electrophilic activation of the Si-H bond in Cp2Nb(SiHMe2)2(H). The Cp2Nb(SiXMe2)(H)(SiYMe2) complexes were prepared by electrophilic activation of the Si-H bond in 2a-d and, in some cases, by electrophilic exchange of the X halides in Cp2Nb(SiXMe2)2(H) (1) for other halides, Y. The structures of complexes 2b and 2c have been studied by X-ray and neutron diffraction (ND). The ND results unequivocally established that the hydride ligand in 2c is shifted toward the SiBrMe2 ligand and that in 2b is positioned symmetrically between two nonequivalent silyl groups, with the H...SiClMe2 distance being shorter because of the shorter Nb-SiClMe2 bond length. Analysis of the X-ray structures of complexes 2a-d and complexes Cp2Nb(SiXMe2)(H)(SiYMe2) shows that the largest structural distortions are observed for the silyl groups substituted by heavy halogen atoms. These trends are rationalized in terms of stronger interligand hypervalent interactions (IHI) Nb-H...Si-X for heavy atoms X from Group 7.
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Affiliation(s)
- Konstantin Yu Dorogov
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia
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21
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Osipov AL, Gerdov SM, Kuzmina LG, Howard JAK, Nikonov GI. Syntheses and X-ray Diffraction Studies of Half-Sandwich Hydridosilyl Complexes of Ruthenium. Organometallics 2005. [DOI: 10.1021/om0495271] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander L. Osipov
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Sergei M. Gerdov
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Lyudmila G. Kuzmina
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Judith A. K. Howard
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
| | - Georgii I. Nikonov
- Chemistry Department, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia, Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia, and Chemistry Department, University of Durham, South Road, Durham DH1 3LE, U.K
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22
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Recent Advances in Nonclassical Interligand Si…H Interactions. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2005. [DOI: 10.1016/s0065-3055(05)53006-5] [Citation(s) in RCA: 172] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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23
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Kwok WH, Lu GL, Rickard CE, Roper WR, Wright LJ. Tethered silyl complexes from nucleophilic substitution reactions at the Si–Cl bond of the chloro(diphenyl)silyl ligand in Ru(SiClPh2)(κ2-S2CNMe2)(CO)(PPh3)2. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2004.06.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Gavenonis J, Tilley TD. Synthesis and Reactivity of Tris(imido)rhenium Complexes Containing Rhenium−Main Group Element Bonds. Silicon−Carbon Bond Activations of PhSiH3 by Silyl Complexes. Inorg Chem 2004; 43:4353-62. [PMID: 15236548 DOI: 10.1021/ic030282e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis and reactivity of a series of complexes of the (DippN=)(3)Re (Dipp = 2,6-(i)Pr(2)C(6)H(3)) fragment are reported. The anionic, Re(V) complex (THF)(2)Li(micro,micro-NDipp)(2)Re(=NDipp) (1), prepared by the reaction of (DippN=)(3)ReCl with (THF)(3)LiSi(SiMe(3))(3) or (t)BuLi (2 equiv) in the presence of THF (4 equiv), served as an important starting material for the synthesis of rhenium-element-bonded complexes. For example, treatment of 1 with ClSiR(3) gave the corresponding silyl complexes (DippN=)(3)ReSiR(3) (SiR(3) = SiMe(3) (2a), SiHPh(2) (2b), SiH(2)Ph (2c)). Complexes 2a-c are thought to exist in equilibrium between the Re(VII) (DippN=)(3)ReSiR(3) and Re(V) (DippN=)(2)ReN(SiR(3))Dipp isomers. Complexes 2a,b reacted with PhSiH(3) to give reaction mixtures that included 2c, Ph(2)SiH(2), SiH(4), and C(6)H(6). The silane and organic products arise from Si-C bond formation and cleavage. Treatment of 2a with CO gave (DippN=)(2)Re[N(SiMe(3))Dipp](CO) (3), which appears to result from trapping of the reactive Re(V) isomer of 2a by CO. Complex 1 reacted with the main group halides MeI, Ph(3)GeCl, Me(3)SnCl, Ph(2)PCl, and PhSeCl to give the corresponding rhenium complexes (DippN=)(3)ReER(n) (ER(n)() = Me (4), GePh(3) (5), SnMe(3) (6), PPh(2) (7), SePh (8)) in high yields. X-ray diffraction data for 5 indicate that the germyl ligand is bonded to rhenium, but positional disorder of the phenyl and Dipp groups prevented refinement of accurate metric parameters.
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Affiliation(s)
- John Gavenonis
- Department of Chemistry, University of California at Berkeley, Berkeley, California 94720-1460, USA
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Dorogov K, Churakov A, Kuzmina L, Howard J, Nikonov G. Direct Hydride/Silyl Exchange — Synthesis and X‐ray Study of the Bis(silyl) Complex [Cp
2
NbH(SiCl
3
)
2
]. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300134] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Konstantin Yu. Dorogov
- Chemistry Department, Moscow State University, Vorob’evy Gory, 119992 Moscow, Russia, Fax: (internat.) + 7‐095‐932‐8846
| | - Andrei V. Churakov
- Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia
| | - Lyudmila G. Kuzmina
- Institute of General and Inorganic Chemistry RAS, Leninskii Prosp. 31, 119991 Moscow, Russia
| | | | - Georgii I. Nikonov
- Chemistry Department, Moscow State University, Vorob’evy Gory, 119992 Moscow, Russia, Fax: (internat.) + 7‐095‐932‐8846
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Ignatov SK, Rees NH, Dubberley SR, Razuvaev AG, Mountford P, Nikonov GI. Unexpected features of stretched Si–H⋯Mo β-agostic interactions. Chem Commun (Camb) 2004:952-3. [PMID: 15069490 DOI: 10.1039/b315517j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Coupling of silanes with the imido group of (Ar'N)2Mo(PMe3)3 gives either the silanimine dimer (ArN-SiHCl)2 or Si-H agostic silylamido complexes which do not exhibit the commonly expected correlation between the nature of the substituents on silicon, the degree of Si-H addition and the value of the Si-H coupling constant.
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Affiliation(s)
- Stanislav K Ignatov
- University of Nizhnii Novgorod, 23 Gagarin Avenue, Nizhnii Novgorod 603600, Russia
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