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Denhof A, Olaru M, Lork E, Mebs S, Chęcińska L, Beckmann J. Silyl Cations Stabilized by Pincer Type Ligands with Adjustable Donor Atoms. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000800] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Andreas Denhof
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
| | - Marian Olaru
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
- Department of Chemistry Supramolecular Organic and Organometallic Chemistry Centre Babes‐Bolyai University 11 Arany Janos 400028 Cluj‐Napoca Romania
| | - Enno Lork
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
| | - Stefan Mebs
- Institut für Experimentalphysik Freie Universität Berlin Arnimallee 14 14195 Berlin Germany
| | - Lilianna Chęcińska
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
- Department of Theoretical and Structural Chemistry Faculty of Chemistry University of Lodz Pomorska 163/165 90‐236 Lodz Poland
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
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Schröder A, Denhof A, Lork E, Beckmann J. Reactivity of 2,6-Dihalophenyl Lithium Reagents Towards Chlorosilanes. Synthesis and Structure of 2,3- and 2,6-Dihalophenyl(di-)silanes. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Artem Schröder
- Institut für Anorganische Chemie und Kristallographie; Universität Bremen; Leobener Straße 7 28359 Bremen Germany
| | - Andreas Denhof
- Institut für Anorganische Chemie und Kristallographie; Universität Bremen; Leobener Straße 7 28359 Bremen Germany
| | - Enno Lork
- Institut für Anorganische Chemie und Kristallographie; Universität Bremen; Leobener Straße 7 28359 Bremen Germany
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie; Universität Bremen; Leobener Straße 7 28359 Bremen Germany
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Sunada Y, Ogushi H, Yamamoto T, Uto S, Sawano M, Tahara A, Tanaka H, Shiota Y, Yoshizawa K, Nagashima H. Disilaruthena- and Ferracyclic Complexes Containing Isocyanide Ligands as Effective Catalysts for Hydrogenation of Unfunctionalized Sterically Hindered Alkenes. J Am Chem Soc 2018; 140:4119-4134. [DOI: 10.1021/jacs.8b00812] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tahara A, Tanaka H, Sunada Y, Shiota Y, Yoshizawa K, Nagashima H. Theoretical Study of the Catalytic Hydrogenation of Alkenes by a Disilaferracyclic Complex: Can the Fe-Si σ-Bond-Assisted Activation of H-H Bonds Allow Development of a Catalysis of Iron? J Org Chem 2016; 81:10900-10911. [PMID: 27704834 DOI: 10.1021/acs.joc.6b01961] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mechanisms associated with the hydrogenation of alkenes catalyzed by the iron complex Fe(cis-CO)2{o-(SiMe2)2C6H4}2(H)2 (1) were investigated by DFT calculations. The complex 1 has a structure in which the iron center is bonded to four silicon atoms and two hydrides. Secondary Si···H···Si interactions were also observed. The exchange of a 1,2-bis(dimethylsilyl)benzene ligand with ethylene and hydrogen gives a disilaferracycle bearing η2-(CH2═CH2) and η2-H2 ligands. The catalytic cycle initiated from the disilaferracycle involves cleavage of a H-H linkage assisted by an Fe-Si bond to form Fe-H and η1-(H-Si) moieties (step 1), hydrogen migration from the Fe-H group to the η2-(CH2═CH2) ligand which accomplishes the insertion of ethylene into the Fe-H bond (step 2), and reaction of the resulting β-agostic ethyl moiety with the η2-(H-Si) group to form ethane on the iron atom (step 3). The octahedral geometry of 1 as well as the presence of π-acidic CO ligands and Fe-Si σ-bonds contributes to all of the catalytic intermediates and the transition states being in the low-spin state. Steps 1 and 3 correspond to the σ-complex-assisted metathesis (σ-CAM) mechanisms proposed by Perutz and Sabo-Etienne, suggesting that these mechanisms can assist in the design of iron-based hydrogenation catalysts operating under mild conditions.
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Affiliation(s)
| | | | | | | | | | - Hideo Nagashima
- CREST, Japan Science and Technology Agency , Tokyo 102-0076, Japan
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Grabowsky S, Beckmann J, Luger P. The Nature of Hydrogen Bonding Involving the Siloxane Group. Aust J Chem 2012. [DOI: 10.1071/ch11468] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Variation of the Si–O–Si angle in siloxane compounds is a way to tune their basicity from highly hydrophobic systems at linear geometry to hydrophilic systems at small angles. This has great potential in the design of new siloxane materials with properties distinct from those of known silicones. We investigate hydrogen bonds with the siloxane linkage as an acceptor in a large range of Si–O–Si angles for the two hydrogen-bonded complexes disiloxane⋯silanol [(H3Si)2O⋯HOSiH3] and disiloxane⋯water [(H3Si)2O⋯HOH] with free disiloxane [H3SiOSiH3] as reference in a quantum-mechanical ab-initio study. Geometry, electron density, and the electron localizability indicator provide several complementary indicators of hydrogen bonding which show how Si–O–Si angle variation affects the nature and strength of these unusual hydrogen bonds.
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Grabowsky S, Hesse MF, Paulmann C, Luger P, Beckmann J. How to Make the Ionic Si−O Bond More Covalent and the Si−O−Si Linkage a Better Acceptor for Hydrogen Bonding. Inorg Chem 2009; 48:4384-93. [DOI: 10.1021/ic900074r] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simon Grabowsky
- Anorganische und Analytische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany, Kristallographie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 36a, 14195 Berlin, Germany, and Mineralogisch-Petrographisches Institut, Universität Hamburg, c/o HASYLAB/DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Maxie F. Hesse
- Anorganische und Analytische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany, Kristallographie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 36a, 14195 Berlin, Germany, and Mineralogisch-Petrographisches Institut, Universität Hamburg, c/o HASYLAB/DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Carsten Paulmann
- Anorganische und Analytische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany, Kristallographie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 36a, 14195 Berlin, Germany, and Mineralogisch-Petrographisches Institut, Universität Hamburg, c/o HASYLAB/DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Peter Luger
- Anorganische und Analytische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany, Kristallographie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 36a, 14195 Berlin, Germany, and Mineralogisch-Petrographisches Institut, Universität Hamburg, c/o HASYLAB/DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Jens Beckmann
- Anorganische und Analytische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany, Kristallographie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 36a, 14195 Berlin, Germany, and Mineralogisch-Petrographisches Institut, Universität Hamburg, c/o HASYLAB/DESY, Notkestr. 85, 22607 Hamburg, Germany
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