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Issue 12, 2006
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Ge52− Zintl anions: synthesis and crystal structures of [K([2.2.2]-crypt)]2Ge5·4NH3 and [Rb([2.2.2]-crypt)]2Ge5·4NH3

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Abstract

The new compounds [K(C18H36N2O6)]2Ge5·4NH3 (1) and [Rb(C18H36N2O6)]2Ge5·4NH3 (2) were prepared by the extraction of a binary phase of the nominal composition KGe1.67 and a ternary phase of the composition Rb0.5Cs0.5Ge2.25 with liquid ammonia in the presence of cryptand [2.2.2]. The resulting crystalline materials were characterized by low temperature X-ray structure analysis. Compounds 1 and 2 contain isolated trigonal-bipyramidal Ge52− cage anions, the symmetries of which were investigated and compared to the previously reported pentagermanide anion. Despite the nearly identical formulae, the two compounds are not isotypic, as the space group type changes from the acentric group P1 (no. 1) for the potassium compound to P[1 with combining macron] (no. 2) for the rubidium compound.

Graphical abstract: Ge52− Zintl anions: synthesis and crystal structures of [K([2.2.2]-crypt)]2Ge5·4NH3 and [Rb([2.2.2]-crypt)]2Ge5·4NH3

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Publication details

The article was received on 24 Jul 2006, accepted on 08 Sep 2006 and first published on 27 Sep 2006


Article type: Paper
DOI: 10.1039/B610547E
Citation: New J. Chem., 2006,30, 1737-1739
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    Ge52− Zintl anions: synthesis and crystal structures of [K([2.2.2]-crypt)]2Ge5·4NH3 and [Rb([2.2.2]-crypt)]2Ge5·4NH3

    C. Suchentrunk and N. Korber, New J. Chem., 2006, 30, 1737
    DOI: 10.1039/B610547E

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