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Structural Investigation of a Fully Ordered closo-Ge-9(2-) Cluster in the Compound [K+(2,2,2-crypt)](2)Ge-9(2-)

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Author

  • Josefin Akerstedt
  • Simeon Ponou
  • Lars Kloo
  • Sven Lidin

Summary, in English

[K+(2,2,2-crypt)] Ge-2(9)2- containing the deltahedral Zintl anion Ge-9(2-) has been isolated from a solution of K4Ge9 in ethylenediamine in the presence of 2,2,2-crypt, intended as an intermediate in mixed-cluster synthesis. The subsequent crystallographic characterisation shows the closo-Ge-9(2-) cluster unit to be tricapped trigonal-prismatic with a symmetry very close to D-3h. Each Ge-9(2-) unit is surrounded by two 2,2,2-crypt units, each with a chelated K+ cation, viz. [K+(2,2,2-crypt)]. The structure characterisation of this ordered Ge-9(2-) cluster is surprisingly enough the first one reported. A chemical bonding analysis reveals two local minima of D-3h symmetry, with that of lowest energy being highly similar to that resulting from the crystallographic analysis of low-temperature data. The cluster interaction scheme is based on highly delocalised bonding.

Publishing year

2011

Language

English

Pages

3999-4005

Publication/Series

European Journal of Inorganic Chemistry

Issue

26

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Chemical Sciences

Keywords

  • Germanium
  • Zintl anions
  • Cluster compounds
  • X-ray diffraction
  • Cryptands

Status

Published

ISBN/ISSN/Other

  • ISSN: 1099-0682