Chapter 47. Silicon and Germanium Amidinates

  1. Prof. Norbert Auner2 and
  2. Prof. Johann Weis3
  1. Hans H. Karsch and
  2. Peter A. Schlüter

Published Online: 28 APR 2008

DOI: 10.1002/9783527619917.ch47

Organosilicon Chemistry IV: From Molecules to Materials

Organosilicon Chemistry IV: From Molecules to Materials

How to Cite

Karsch, H. H. and Schlüter, P. A. (2000) Silicon and Germanium Amidinates, in Organosilicon Chemistry IV: From Molecules to Materials (eds N. Auner and J. Weis), Wiley-VCH Verlag GmbH, Weinheim, Germany. doi: 10.1002/9783527619917.ch47

Editor Information

  1. 2

    Inst. für Anorganische Chemie, der Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt am Main, Germany, Phone: 0 69/7 98-29180, -29591, Fax: 069/798-29188

  2. 3

    Wacker-Chemie GmbH, Geschäftsbereich S, Werk Burghausen, Johannes-Hess-Strasse 24, D-84489 Burghausen, Germany

Author Information

  1. Anorganisch-chemisches Institut der Technischen Universität München Lichtenbergstr. 4, D85747 Garching, Germany Tel.: Int. code + (89)28913132—Fax: Int. code + (89)28914421

Publication History

  1. Published Online: 28 APR 2008
  2. Published Print: 17 JAN 2000

ISBN Information

Print ISBN: 9783527298549

Online ISBN: 9783527619917

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Keywords:

  • silicon amidinates;
  • germanium amidinates;
  • bidentate coordination;
  • pentacoordination;
  • hexacoordination

Summary

The synthesis of novel amidinate silicon and germanium complexes is described. It is shown that the coordination chemistry of amidinate ligands at Si(IV), Ge(II) and Ge(IV) metal centers is strongly influenced by the substituents on the nitrogen and carbon atom. The reaction of different stoichiometric amounts of lithium amidinates with GeCl4 and Sicl4 leads to mono-, di- and trisubstituted compounds, while the reaction of 2 equiv. NH(tBu)C(Ph)NLi with GeCl2.dioxane yields a tetrameric species. Therefore monoanionic, bidentate four-electron donor amidinate ligands are highly suitable for stabilizing low oxidation states and/ or high coordination numbers at group 14 element centers (Si, Ge). A newly synthesized hexacoordinated cis-dichloro-silicon (bis)amidinate complex possibly might be a promising candidate as a precursor for new stable Si(II) compounds.