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Hartmann D, Schädler M, Greb L. Bis(catecholato)silanes: assessing, rationalizing and increasing silicon's Lewis superacidity. Chem Sci 2019; 10:7379-7388. [PMID: 31489160 PMCID: PMC6713871 DOI: 10.1039/c9sc02167a] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 06/14/2019] [Indexed: 12/14/2022] Open
Abstract
Although bis(catecholato)silanes have been known for several decades, their substantial Lewis acidity is not yet well described in the literature. Herewith, the synthesis and characterization of multiple substituted bis(catecholato)silanes and their triethylphosphine oxide, fluoride and chloride ion adducts are reported. The Lewis acidity of bis(catecholato)silanes is assessed by effective (Gutmann-Beckett, catalytic efficiency), global (theoretical and relative experimental fluoride (FIA) and chloride (CIA) ion affinities) and intrinsic (electrophilicity index) scaling methods. This comprehensive set of experimental and theoretical results reveals their general Lewis acidic nature and provides a consistent Lewis acidity trend for bis(catecholato)silanes for the first time. All experimental findings are supported by high-level DLPNO-CCSD(T) based thermochemical data and the Lewis acidity is rationalized by complementary chemical bonding analysis tools. Against the common belief that inductive electron withdrawal is the most important criterion for strong Lewis acidity, the present work highlights the decisive role of π-back bonding effects in aromatic ring systems to enhance electron deficiency. Thus, bis(perbromocatecholato)silane is identified and synthesized as the new record holder for silicon Lewis superacids.
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Affiliation(s)
- Deborah Hartmann
- Anorganisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 275 , 69120 Heidelberg , Germany .
| | - Marcel Schädler
- Anorganisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 275 , 69120 Heidelberg , Germany .
| | - Lutz Greb
- Anorganisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 275 , 69120 Heidelberg , Germany .
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Sohail M, Bassindale AR, Taylor PG, Korlyukov AA, Arkhipov DE, Male L, Coles SJ, Hursthouse MB. Synthesis and Hydrolysis–Condensation Study of Water-Soluble Self-Assembled Pentacoordinate Polysilylamides. Organometallics 2013. [DOI: 10.1021/om301137b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Muhammad Sohail
- Department of Chemistry and Analytical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA,
U.K
| | - Alan R. Bassindale
- Department of Chemistry and Analytical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA,
U.K
| | - Peter G. Taylor
- Department of Chemistry and Analytical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA,
U.K
| | - Alexander A. Korlyukov
- A.N. Nesmeyanov Institute
of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilov Street, B-334, Moscow 119991, Russia
| | - Dmitry E. Arkhipov
- A.N. Nesmeyanov Institute
of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilov Street, B-334, Moscow 119991, Russia
| | - Louise Male
- EPSRC National Crystallography
Service, School of Chemistry, University of Southampton, Southampton, SO17 1BJ U.K
| | - Simon J. Coles
- EPSRC National Crystallography
Service, School of Chemistry, University of Southampton, Southampton, SO17 1BJ U.K
| | - Michael B. Hursthouse
- EPSRC National Crystallography
Service, School of Chemistry, University of Southampton, Southampton, SO17 1BJ U.K
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Ladewig K, Seifert A, Hahn H, Hietschold M, Moszner N, Burtscher P, Spange S. para-Nitroaniline-functionalized chromophoric organic–inorganic hybrid materials. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15407b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Riedel F, Spange S. A solvatochromic study of silicates and borate containing 4-nitrocatechol ligands. J PHYS ORG CHEM 2009. [DOI: 10.1002/poc.1468] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Abstract
Hydrazide-based hypercoordinate silicon dichelates are remarkably flexible in terms of geometry and reactivity: this paper demonstrates how rather subtle constitutional changes result in dramatic geometrical and reactivity changes. A change of ligand-donor group from NMe2 to N=CMe2 changes the solid-state geometry from bicapped tetrahedral to octahedral. These two geometries are shown to coexist in solution in dynamic equilibrium. Hexacoordinate complexes are shown to dissociate to pentacoordinate compounds in two distinct ways: ionic or neutral, depending on substitution. Hexacoordinate dichelates with imino-donor groups undergo a skeletal rearrangement (intramolecular aldol-type condensation of imines), catalyzed by their dissociated halide counterions. However, even in the absence of counterions, silacyclobutane dichelates undergo a similar rearrangement.
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6
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Gan L, Brook MA. Competitive Substitution Reactions at Extracoordinate Silicon during Asymmetric Hydrosilylation. Organometallics 2006. [DOI: 10.1021/om0606035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Li Gan
- Department of Chemistry, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
| | - Michael A. Brook
- Department of Chemistry, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
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Seiler O, Burschka C, Metz S, Penka M, Tacke R. Synthesis and Structural Characterization of Neutral Higher-Coordinate Silicon(iv) Complexes with Tridentate Dianionic Chelate Ligands. Chemistry 2005; 11:7379-86. [PMID: 16187376 DOI: 10.1002/chem.200500296] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The neutral pentacoordinate silicon(IV) complexes 8 and 9 with an SiO2N3 skeleton and the neutral hexacoordinate silicon(IV) complex 10.1/2 CH3CN with an SiO4N2 skeleton were synthesized, starting from tetra(cyanato-N)silane or tetra(thiocyanato-N)silane. Compounds 8 and 9 contain one tridentate dianionic ligand derived from 4-[(2-hydroxyphenyl)amino]pent-3-en-2-one and two monodentate singly charged cyanato-N or thiocyanato-N ligands bound to the silicon(IV) coordination center, whereas the silicon(IV) center of 10 is coordinated by two of these tridentate dianionic ligands. All compounds were characterized by single-crystal X-ray diffraction and solid-state and solution NMR spectroscopy. To get more information about the stereochemistry of the compounds studied, the experimental investigations were complemented by computational studies.
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Affiliation(s)
- Oliver Seiler
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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8
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Tacke R, Bertermann R, Burschka C, Dragota S. Hexacoordinate Silicon(IV) Complexes withSiO6 Skeletons and Multidentate Ligands Derived from Citric Acid or Malic Acid. Z Anorg Allg Chem 2004. [DOI: 10.1002/zaac.200400237] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Tacke R, Mühleisen M, Jones PG. The First Zwitterionic, Optically Active Disilicate with Pentacoordinate Silicon. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.199411861] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Tacke R, Bertermann R, Dannappel O, Neugebauer RE, Pülm M, Willeke R. Monocyclic Zwitterionic λ5Si-Silicates with an SiO2FC2 Framework: Syntheses and Structural Characterization in the Solid State and in Solution. Inorg Chem 2001; 40:2520-7. [PMID: 11350229 DOI: 10.1021/ic0014484] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of the acyclic zwitterionic pentacoordinate silicate F(3)MeSiCH(2)NMe(2)H with 1 molar equiv of Me(3)SiOC(6)H(4)OSiMe(3), Me(3)SiOCH(2)C(O)OSiMe(3), Me(3)SiOC(Ph)=NOSiMe(3), or Me(3)SiOC(O)C(O)OSiMe(3) (solvent CH(3)CN, room temperature) yielded the respective monocyclic zwitterionic pentacoordinate silicates (11a), (12a), (13a), and (14a), along with 2 molar equiv of Me(3)SiF. The derivatives 11b-14b with a 2,2,6,6-tetramethylpiperidinio substituent instead of the dimethylammonio group were prepared analogously, starting from F(3)MeSiCH(2)NR(2)H (NR(2)H = 2,2,6,6-tetramethylpiperidinio). Single-crystal X-ray diffraction studies showed that the Si-coordination polyhedra of 11a.1.5CH(3)CN, 12a-14a, and 11b-14b are distorted trigonal bipyramids, the axial positions being occupied by the fluorine atom and one of the two oxygen atoms (12a/12b, carboxylate oxygen atom; 13a/13b, carbon-linked oxygen atom). These results are in agreement with the NMR data ((1)H, (13)C, (19)F, (29)Si) obtained for these compounds in solution. The chiral (C(1) symmetry) zwitterions 11a-14a and 11b-14b exist as pairs of (A)- and (C)-enantiomers in solution. VT (1)H NMR studies with 11b-14b in CH(3)CN in the temperature range 25-85 degrees C gave no indications for an enantiomerization process [(A)/(C)-enantiomerization] at the silicon atom.
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Affiliation(s)
- R Tacke
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Tacke R, Ulmer B, Wagner B, Arlt M. A Novel Silicon-Based Linkage and Cleavage Strategy for Solid-Phase Synthesis: Formation of Resin-Linked Zwitterionic Pentacoordinate Silicates as the Key Step and Release of the Target Molecules in a Traceless Fashion. Organometallics 2000. [DOI: 10.1021/om000616x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Reinhold Tacke
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, and Merck KGaA, Frankfurter Strasse 250, D-64293 Darmstadt, Germany
| | - Bernhard Ulmer
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, and Merck KGaA, Frankfurter Strasse 250, D-64293 Darmstadt, Germany
| | - Brigitte Wagner
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, and Merck KGaA, Frankfurter Strasse 250, D-64293 Darmstadt, Germany
| | - Michael Arlt
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, and Merck KGaA, Frankfurter Strasse 250, D-64293 Darmstadt, Germany
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13
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Kost D, Kalikhman I, Krivonos S, Bertermann R, Burschka C, Neugebauer RE, Pülm M, Willeke R, Tacke R. New Zwitterionic Pentacoordinate Silicates with SiONFC2, SiONF2C, and SiO2N2C Frameworks: Synthesis, Structure, and Dynamic Stereochemistry. Organometallics 2000. [DOI: 10.1021/om990842a] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Kost
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Inna Kalikhman
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Sonia Krivonos
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Rüdiger Bertermann
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Christian Burschka
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Ruth E. Neugebauer
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Melanie Pülm
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Reiner Willeke
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
| | - Reinhold Tacke
- Department of Chemistry, Ben Gurion University, Beer-Sheva 84105, Israel, and Institut für Anorganische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
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14
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LaRonde FJ, Brook MA. Stereoselective reduction of ketones using extracoordinate silicon: C2-symmetric ligands. Inorganica Chim Acta 1999. [DOI: 10.1016/s0020-1693(99)00356-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Tacke R, Bertermann R, Biller A, Dannappel O, Pülm M, Willeke R. Syntheses, Stereochemistry, and Dynamic Behavior of Chiral Zwitterionic (Ammoniomethyl)bis[glycolato(2–)-O1,O2]silicates. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199905)1999:5<795::aid-ejic795>3.0.co;2-a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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16
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Tacke R, Pfrommer B, Pülm M, Bertermann R. New Chiral Zwitterionic λ5Si-Silicates with anSiO5 orSiO4C Framework: Syntheses, Crystal Structures, and Properties. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199905)1999:5<807::aid-ejic807>3.0.co;2-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Mercado RML, Chandrasekaran A, Day RO, Holmes RR. Synthesis and Structure of Cyclic Zwitterionic Silicates. Formation via Si−N Donor Interaction1. Organometallics 1999. [DOI: 10.1021/om9808413] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ramil-Marcelo L. Mercado
- Department of Chemistry, Box 34510, University of Massachusetts, Amherst, Massachusetts 01003-4510
| | - A. Chandrasekaran
- Department of Chemistry, Box 34510, University of Massachusetts, Amherst, Massachusetts 01003-4510
| | - Roberta O. Day
- Department of Chemistry, Box 34510, University of Massachusetts, Amherst, Massachusetts 01003-4510
| | - Robert R. Holmes
- Department of Chemistry, Box 34510, University of Massachusetts, Amherst, Massachusetts 01003-4510
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19
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20
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Veith M, Rammo A. Synthese und Struktur eines neuartigen molekularen λ5-Organospirosilikats und dessen dynamisches Verhalten in Lösung. J Organomet Chem 1996. [DOI: 10.1016/0022-328x(96)06297-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Karsch HH, Deubelly B, Keller U, Steigelmann O, Lachmann J, Müller G. Hexacoordinated Group-14 Elements with Phosphorus Donor Ligands: Syntheses and Structures of Cl2E[C(PMe2)2(SiMe3)]2 (E = Si, Ge, Sn). ACTA ACUST UNITED AC 1996. [DOI: 10.1002/cber.19961290613] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Tacke R, Becht J, Dannappel O, Ahlrichs R, Schneider U, Sheldrick WS, Hahn J, Kiesgen F. Zwitterionic λ5Si-Organofluorosilicates of the Formula Types F4SiCH2NMe2R and F3MeSiCH2NMe2R (R = H, Me) and Related Compounds: Synthesis, Structure, and Dynamic Behavior. Organometallics 1996. [DOI: 10.1021/om9509296] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Reinhold Tacke
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Joachim Becht
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Olaf Dannappel
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Reinhart Ahlrichs
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Uwe Schneider
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - William S. Sheldrick
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Josef Hahn
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Frank Kiesgen
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany, Lehrstuhl für Theoretische Chemie, Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.43, D-76128 Karlsruhe, Germany, Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany, and Institut für Anorganische Chemie, Universität Köln, Greinstrasse 6, D-50939 Köln, Germany
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23
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Chuit C, Corriu RJP, Mehdi A, Reyé C. Unexpected Basicity of a Hexacoordinate Silicon Compound, {2,6-Bis[ (dimethylamino)methyl]phenyl}bis(1,2-benzenediolato)silicate. Chemistry 1996. [DOI: 10.1002/chem.19960020316] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Tacke R, M�hleisen M, Lopez-Mras A, Sheldrick WS. Synthesen und Kristallstrukturanalysen neuer zwitterionischer spirocyclischer (Ammonioorganyl)bis[vic-arendiolato(2-)]silicate: Untersuchungen zur Struktur der ?5Si-Koordinationspolyeder. Z Anorg Allg Chem 1995. [DOI: 10.1002/zaac.19956210515] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Tacke R, Mühleisen M. Hexakoordiniertes Silicium in einer molekularen Verbindung mit einer F5SiC-Einheit. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Tacke R, Mühleisen M, Jones PG. Das erste zwitterionische, optisch aktive Disilicat mit pentakoordiniertem Silicium. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061123] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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27
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Tacke R, Lopez-Mras A, Becht J, Sheldrick WS. Synthese sowie Kristall- und Molek�lstruktur von Tetrafluoro[2-(pyrrolidinio)ethyl]silicat. Z Anorg Allg Chem 1993. [DOI: 10.1002/zaac.19936190610] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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