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Pantalon Juraj N, Kirin SI. Inorganic stereochemistry: Geometric isomerism in bis-tridentate ligand complexes. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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2
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Meshgi MA, Pöcheim A, Baumgartner J, Jouikov VV, Marschner C. Oligosilanylated Silocanes. Molecules 2021; 26:E244. [PMID: 33466467 PMCID: PMC7796475 DOI: 10.3390/molecules26010244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 12/29/2020] [Accepted: 12/31/2020] [Indexed: 12/02/2022] Open
Abstract
A number of mono- and dioligosilanylated silocanes were prepared. Compounds included silocanes with 1-methyl-1-tris(trimethylsilyl)silyl, 1,1-bis[tris(trimethylsilyl)silyl], and 1,1-bis[tris(trimethylsilyl)germyl] substitution pattern as well as two examples where the silocane silicon atom is part of a cyclosilane or oxacyclosilane ring. The mono-tris(trimethylsilyl)silylated compound could be converted to the respective silocanylbis(trimethylsilyl)silanides by reaction with KOtBu and in similar reactions the cyclosilanes were transformed to oligosilane-1,3-diides. However, the reaction of the 1,1-bis[tris(trimethylsilyl)silylated] silocane with two equivalents of KOtBu leads to the replacement of one tris(trimethylsilyl)silyl unit with a tert-butoxy substituent followed by silanide formation via KOtBu attack at one of the SiMe3 units of remaining tris(trimethylsilyl)silyl group. For none of the silylated silocanes, signs of hypercoordinative interaction between the nitrogen and silicon silocane atoms were detected either in the solid state. by single crystal XRD analysis, nor in solution by 29Si-NMR spectroscopy. This was further confirmed by cyclic voltammetry and a DFT study, which demonstrated that the N-Si distance in silocanes is not only dependent on the energy of a potential N-Si interaction, but also on steric factors and through-space interactions of the neighboring groups at Si and N, imposing the orientation of the pz(N) orbital relative to the N-Si-X axis.
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Affiliation(s)
- Mohammad Aghazadeh Meshgi
- Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria; (M.A.M.); (A.P.)
| | - Alexander Pöcheim
- Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria; (M.A.M.); (A.P.)
| | - Judith Baumgartner
- Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria; (M.A.M.); (A.P.)
| | | | - Christoph Marschner
- Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria; (M.A.M.); (A.P.)
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3
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Ranis LG, Gianino J, Hoffman JM, Brown SN. Nonclassical oxygen atom transfer reactions of an eight-coordinate dioxomolybdenum( vi) complex. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00308a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Eight-coordinate MoO2(DOPOQ)2 can donate two oxygen atoms to substrates such as phosphines in a four-electron nonclassical oxygen atom transfer reaction.
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Affiliation(s)
- Leila G. Ranis
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Jacqueline Gianino
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Justin M. Hoffman
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Seth N. Brown
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
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4
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Greb L, Ebner F, Ginzburg Y, Sigmund LM. Element‐Ligand Cooperativity with p‐Block Elements. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000449] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Lutz Greb
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 275 69120 Heidelberg Germany
| | - Fabian Ebner
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 275 69120 Heidelberg Germany
| | - Yael Ginzburg
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 275 69120 Heidelberg Germany
| | - Lukas M. Sigmund
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 275 69120 Heidelberg Germany
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5
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Chegerev MG, Piskunov AV. Chemistry of Complexes of Group 14 Elements Based on Redox-Active Ligands of the o-Iminoquinone Type. RUSS J COORD CHEM+ 2018. [DOI: 10.1134/s1070328418040036] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Pistner AJ, Moon HW, Silakov A, Yennawar HP, Radosevich AT. Stable Open-Shell Phosphorane Based on a Redox-Active Amidodiphenoxide Scaffold. Inorg Chem 2017; 56:8661-8668. [PMID: 28661124 DOI: 10.1021/acs.inorgchem.7b00657] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis and redox reactivity of pentacoordinate phosphorus compounds incorporating a redox-active ONO amidodiphenoxide scaffold [ONO = N,N-bis(3,5-di-tert-butyl-2-phenoxide)amide] are described. Dichloro- and diphenylphosphoranes, 2·Cl2 and 2·Ph2, respectively, are synthesized and crystallographically characterized. Cyclic voltammograms of 2·Cl2 show only a single irreversible oxidation (Epa = +0.83 V vs Cp2Fe0/+), while the diphenyl analogue 2·Ph2 is reversibly oxidized at lower applied potential (E1/2 = +0.47 V vs Cp2Fe0/+). Chemical oxidation of 2·Ph2 with AgBF4 produces the corresponding radical cation [2·Ph2]•+, where electron paramagnetic resonance spectroscopy and density functional theory calculations reveal that the unpaired spin density is largely ligand-based and is highly delocalized throughout the ONO framework of the paramagnetic species. The solid-state structures indicate only minor geometrical changes between the neutral 2·Ph2 and oxidized [2·Ph2]•+ species, consistent with fast self-exchange electron transfer, as observed by NMR line-broadening experiments.
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Affiliation(s)
| | - Hye Won Moon
- Department of Chemistry, Massachusetts Institute of Technology (MIT) , Cambridge, Massachusetts 02139, United States
| | | | | | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology (MIT) , Cambridge, Massachusetts 02139, United States
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7
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Hoffman JM, Oliver AG, Brown SN. The Metal or the Ligand? The Preferred Locus for Redox Changes in Oxygen Atom Transfer Reactions of Rhenium Amidodiphenoxides. J Am Chem Soc 2017; 139:4521-4531. [DOI: 10.1021/jacs.7b00985] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Justin M. Hoffman
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
| | - Allen G. Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
| | - Seth N. Brown
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
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8
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Broere DLJ, van Leest NP, de Bruin B, Siegler MA, van der Vlugt JI. Reversible Redox Chemistry and Catalytic C(sp3)–H Amination Reactivity of a Paramagnetic Pd Complex Bearing a Redox-Active o-Aminophenol-Derived NNO Pincer Ligand. Inorg Chem 2016; 55:8603-11. [DOI: 10.1021/acs.inorgchem.6b01192] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniël L. J. Broere
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Nicolaas P. van Leest
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Bas de Bruin
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Maxime A. Siegler
- Department of Chemistry, John Hopkins University, Baltimore, Maryland 21218, United States
| | - Jarl Ivar van der Vlugt
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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9
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Wong JL, Higgins RF, Bhowmick I, Cao DX, Szigethy G, Ziller JW, Shores MP, Heyduk AF. Bimetallic iron-iron and iron-zinc complexes of the redox-active ONO pincer ligand. Chem Sci 2016; 7:1594-1599. [PMID: 28808535 PMCID: PMC5530940 DOI: 10.1039/c5sc03006d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 11/27/2015] [Indexed: 12/13/2022] Open
Abstract
Synthetic and magnetic studies of homo- and heterobimetallic complexes of the redox-active ONO pincer ligand.
A new bimetallic platform comprising a six-coordinate Fe(ONO)2 unit bound to an (ONO)M (M = Fe, Zn) has been discovered ((ONOcat)H3 = bis(3,5-di-tert-butyl-2-phenol)amine). Reaction of Fe(ONO)2 with either (ONOcat)Fe(py)3 or with (ONOq)FeCl2 under reducing conditions led to the formation of the bimetallic complex Fe2(ONO)3, which includes unique five- and six-coordinate iron centers. Similarly, the reaction of Fe(ONO)2 with the new synthon (ONOsq˙)Zn(py)2 led to the formation of the heterobimetallic complex FeZn(ONO)3, with a six-coordinate iron center and a five-coordinate zinc center. Both bimetallic complexes were characterized by single-crystal X-ray diffraction studies, solid-state magnetic measurements, and multiple spectroscopic techniques. The magnetic data for FeZn(ONO)3 are consistent with a ground state S = 3/2 spin system, generated from a high-spin iron(ii) center that is antiferromagnetically coupled to a single (ONOsq˙)2– radical ligand. In the case of Fe2(ONO)3, the magnetic data revealed a ground state S = 7/2 spin system arising from the interactions of one high-spin iron(ii) center, one high-spin iron(iii) center, and two (ONOsq˙)2– radical ligands.
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Affiliation(s)
- Janice L Wong
- Department of Chemistry , University of California , Irvine , California 92697 , USA . ; Tel: +1-949-824-8806
| | - Robert F Higgins
- Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523 , USA . ; Tel: +1-970-491-7235
| | - Indrani Bhowmick
- Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523 , USA . ; Tel: +1-970-491-7235
| | - David Xi Cao
- Department of Chemistry , University of California , Irvine , California 92697 , USA . ; Tel: +1-949-824-8806
| | - Géza Szigethy
- Department of Chemistry , University of California , Irvine , California 92697 , USA . ; Tel: +1-949-824-8806
| | - Joseph W Ziller
- Department of Chemistry , University of California , Irvine , California 92697 , USA . ; Tel: +1-949-824-8806
| | - Matthew P Shores
- Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523 , USA . ; Tel: +1-970-491-7235
| | - Alan F Heyduk
- Department of Chemistry , University of California , Irvine , California 92697 , USA . ; Tel: +1-949-824-8806
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10
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Broere DLJ, Plessius R, van der Vlugt JI. New avenues for ligand-mediated processes--expanding metal reactivity by the use of redox-active catechol, o-aminophenol and o-phenylenediamine ligands. Chem Soc Rev 2015; 44:6886-915. [PMID: 26148803 DOI: 10.1039/c5cs00161g] [Citation(s) in RCA: 329] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Redox-active ligands have evolved from being considered spectroscopic curiosities - creating ambiguity about formal oxidation states in metal complexes - to versatile and useful tools to expand on the reactivity of (transition) metals or to even go beyond what is generally perceived possible. This review focusses on metal complexes containing either catechol, o-aminophenol or o-phenylenediamine type ligands. These ligands have opened up a new area of chemistry for metals across the periodic table. The portfolio of ligand-based reactivity invoked by these redox-active entities will be discussed. This ranges from facilitating oxidative additions upon d(0) metals or cross coupling reactions with cobalt(iii) without metal oxidation state changes - by functioning as an electron reservoir - to intramolecular ligand-to-substrate single-electron transfer to create a reactive substrate-centered radical on a Pd(ii) platform. Although the current state-of-art research primarily consists of stoichiometric and exploratory reactions, several notable reports of catalysis facilitated by the redox-activity of the ligand will also be discussed. In conclusion, redox-active ligands containing catechol, o-aminophenol or o-phenylenediamine moieties show great potential to be exploited as reversible electron reservoirs, donating or accepting electrons to activate substrates and metal centers and to enable new reactivity with both early and late transition as well as main group metals.
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Affiliation(s)
- Daniël L J Broere
- University of Amsterdam, van't Hoff Institute for Molecular Sciences, Homogeneous, Bio-Inspired and Supramolecular Catalysis Group, Science Park 904, Amsterdam, the Netherlands
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11
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Romain C, Specklin D, Miqueu K, Sotiropoulos JM, Fliedel C, Bellemin-Laponnaz S, Dagorne S. Unusual Benzyl Migration Reactivity in NHC-Bearing Group 4 Metal Chelates: Synthesis, Characterization, and Mechanistic Investigations. Organometallics 2015. [DOI: 10.1021/om501143t] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Charles Romain
- Institut
de chimie de Strasbourg, UMR 7177, CNRS-Université de Strasbourg, 1 rue
Blaise Pascal, F-67000 Strasbourg, France
| | - David Specklin
- Institut
de chimie de Strasbourg, UMR 7177, CNRS-Université de Strasbourg, 1 rue
Blaise Pascal, F-67000 Strasbourg, France
| | - Karinne Miqueu
- Institut
des Sciences Analytiques et de Physico-Chimie pour l’Environnement
et les Matériaux, UMR 5254, Université de Pau et des Pays de l’Adour, Technopôle Hélioparc, 2 avenue du Président Angot, F-64053 Pau cedex 09, France
| | - Jean-Marc Sotiropoulos
- Institut
des Sciences Analytiques et de Physico-Chimie pour l’Environnement
et les Matériaux, UMR 5254, Université de Pau et des Pays de l’Adour, Technopôle Hélioparc, 2 avenue du Président Angot, F-64053 Pau cedex 09, France
| | - Christophe Fliedel
- Institut
de chimie de Strasbourg, UMR 7177, CNRS-Université de Strasbourg, 1 rue
Blaise Pascal, F-67000 Strasbourg, France
| | - Stéphane Bellemin-Laponnaz
- Institut
de Physique et Chimie des Matériaux de Strasbourg UMR 7504, CNRS-Université de Strasbourg, 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex
2, France and
| | - Samuel Dagorne
- Institut
de chimie de Strasbourg, UMR 7177, CNRS-Université de Strasbourg, 1 rue
Blaise Pascal, F-67000 Strasbourg, France
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12
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Shekar S, Brown SN. Mechanism and selectivity of methyl and phenyl migrations in hypervalent silylated iminoquinones. J Org Chem 2014; 79:12047-55. [PMID: 25289545 DOI: 10.1021/jo501888r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Chlorosilanes R(X)(Y)SiCl (R = Me, Ph; X, Y = Me, Ph, Cl) have been reported to react with Pb(ONO(Q))2 (ONO(Q) = 3,5-di-tert-butyl-1,2-quinone-(3,5-di-tert-butyl-2-oxy-1-phenyl)imine) to give five-coordinate (X)(Y)Si(ON[R]O), in which the R group has migrated from silicon to nitrogen. This migration is intramolecular, as confirmed by the lack of crossover between (CH3)3SiCl and (CD3)3SiCl in their reaction with Pb(ONO(Q))2. Reaction of PhSiMeCl2 takes place with high kinetic stereoselectivity to produce isomer Ph(Cl)Si(ON[Me]O) in which the phenyl is axial in the trigonal bipyramid, which subsequently isomerizes to the thermodynamic isomer with axial chlorine. This indicates that migration takes place preferentially from the stereoisomer of the octahedral intermediate, κ(3)-Ph(CH3)(Cl)Si(ONO(Q)), in which the phenyl and methyl groups are mutually trans, indicating that the observed complete selectivity for methyl over phenyl migration is due to intrinsic differences in migratory aptitude. DFT calculations suggest that migration takes place from this isomer not because it undergoes migration faster than other possible stereoisomers, but because it is formed most rapidly, and migration occurs faster than isomerization.
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Affiliation(s)
- Sukesh Shekar
- Department of Chemistry and Biochemistry, University of Notre Dame , 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
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13
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Smolyaninov IV, Poddel’sky AI, Smolyaninova SA, Berberova NT. Penta- and hexacoordinate antimony(V) compounds with the tridentate O,N,O-donor ligand: Electrochemical transformations and antiradical activity. RUSS J COORD CHEM+ 2014. [DOI: 10.1134/s1070328414090097] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Ranis LG, Werellapatha K, Pietrini NJ, Bunker BA, Brown SN. Metal and Ligand Effects on Bonding in Group 6 Complexes of Redox-Active Amidodiphenoxides. Inorg Chem 2014; 53:10203-16. [DOI: 10.1021/ic501222n] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Leila G. Ranis
- Department
of Chemistry and Biochemistry and ‡Department of Physics, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
| | - Kalpani Werellapatha
- Department
of Chemistry and Biochemistry and ‡Department of Physics, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
| | - Nicholas J. Pietrini
- Department
of Chemistry and Biochemistry and ‡Department of Physics, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
| | - Bruce A. Bunker
- Department
of Chemistry and Biochemistry and ‡Department of Physics, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
| | - Seth N. Brown
- Department
of Chemistry and Biochemistry and ‡Department of Physics, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670, United States
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15
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Kämpfe A, Brendler E, Kroke E, Wagler J. 2-Acylpyrroles as mono-anionic O,N-chelating ligands in silicon coordination chemistry. Chemistry 2014; 20:9409-18. [PMID: 25043769 DOI: 10.1002/chem.201402803] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Indexed: 11/07/2022]
Abstract
Kryptopyrrole (2,4-dimethyl-3-ethylpyrrole) was acylated with, for example, benzoyl chloride to afford 2-benzoyl-3,5-dimethyl-4-ethylpyrrole (L(1)H). With SiCl4 this ligand reacts under liberation of HCl and formation of the complex L(1)2SiCl2. In related reactions with HSiCl3 or H2SiCl2, the same chlorosilicon complex is formed under liberation of HCl and H2 or liberation of H2, respectively. The chlorine atoms of L(1)2SiCl2 can be replaced by fluoride and triflate using ZnF2 and Me3Si-OTf, respectively. The use of a supporting base (triethylamine) is required for the complexation of phenyltrichlorosilane and diphenyldichlorosilane. The complexes L(1)2SiCl2, L(1)2SiF2, L(1)2Si(OTf)2, L(1)2SiPhCl, and L(1)2SiPh2 exhibit various configurations of the octahedral silicon coordination spheres (i.e. cis or trans configuration of the monodentate substituents, different orientations of the bidentate chelating ligands relative to each other). Furthermore, cationic silicon complexes L(1)3Si(+) and L(1) SiPh(+) were synthesized by chloride abstraction with GaCl3. In contrast, reaction of L(1)2SiCl2 with a third equivalent of L(1)H in the presence of excess triethylamine produced a charge-neutral hexacoordinate Si complex with a new tetradentate chelating ligand which formed by Si-templated C-C coupling of two ligands L(1).
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Affiliation(s)
- Alexander Kämpfe
- Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, 09596 Freiberg (Germany), Fax: (+49) 3731394058
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Cipressi J, Brown SN. Octahedral to trigonal prismatic distortion driven by subjacent orbital π antibonding interactions and modulated by ligand redox noninnocence. Chem Commun (Camb) 2014; 50:7956-9. [DOI: 10.1039/c4cc03404j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ruthenium and osmium bis(amidodiphenoxides) distort towards trigonal prismatic geometries to minimize aryloxide-to-metal π* interactions, limited by increasing degree of oxidation of the redox-active ligand.
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Affiliation(s)
- Jacqueline Cipressi
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame, USA
| | - Seth N. Brown
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame, USA
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17
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Wagler J, Brendler E, Heine T, Zhechkov L. Disilicon complexes with two hexacoordinate Si atoms: paddlewheel-shaped isomers with (ClN4 )Si-Si(S4 Cl) and (ClN2 S2 )Si-Si(S2 N2 Cl) skeletons. Chemistry 2013; 19:14296-303. [PMID: 24009095 DOI: 10.1002/chem.201300452] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 06/07/2013] [Indexed: 11/11/2022]
Abstract
The reaction of 1-methyl-3-trimethylsilylimidazoline-2-thione with hexachlorodisilane proceeds toward substitution of four of the disilane Cl atoms during the formation of disilicon complexes with two neighboring hexacoordinate Si atoms. The N,S-bidentate methimazolide moieties adopt a buttressing role, thus forming paddlewheel-shaped complexes of the type ClSi(μ-mt)4 SiCl (mt=methimazolyl). Most interestingly, three isomers (i.e., with (ClN4 )SiSi(S4 Cl), (ClN3 S)SiSi(S3 NCl), and (ClN2 S2 )SiSi(S2 N2 Cl) skeletons as so-called (4,0), (3,1), and cis-(2,2) paddlewheels) were detected in solution by using (29) Si NMR spectroscopic analysis. Two of these isomers could be isolated as crystalline solids, thus allowing their molecular structures to be analyzed by using X-ray diffraction studies. In accord with time-dependent NMR spectroscopy, computational analyses proved the cis-(2,2) isomer with a (ClN2 S2 )SiSi(S2 N2 Cl) skeleton to be the most stable. The compounds presented herein are the first examples of crystallographically evidenced disilicon complexes with two SiSi-bonded octahedrally coordinated Si atoms and representatives of the still scarcely explored class of Si coordination compounds with sulfur donor atoms.
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Affiliation(s)
- Jörg Wagler
- Institut für Anorganische Chemie, TU Bergakademie Freiberg, 09596 Freiberg (Germany), Fax: (+49) 3731-39-4058.
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18
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Wright DD, Brown SN. Nonclassical Oxygen Atom Transfer as a Synthetic Strategy: Preparation of an Oxorhenium(V) Complex of the Bis(3,5-di-tert-butyl-2-phenoxo)amide Ligand. Inorg Chem 2013; 52:7831-3. [DOI: 10.1021/ic4010592] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel D. Wright
- Department
of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556-5670,
United States
| | - Seth N. Brown
- Department
of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556-5670,
United States
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19
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Tokoro Y, Tanaka K, Chujo Y. Synthesis of Dibenzo[b,f]silepins with a Benzoquinolyl Ligand. Org Lett 2013; 15:2366-9. [DOI: 10.1021/ol400730n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Yuichiro Tokoro
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Kazuo Tanaka
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yoshiki Chujo
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
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