Alkali Metal Tetrelide-Tetrelates: "Double Salts" With [E(4)](4-) Zintl Anions (E=Si, Ge) and the First Dimeric Cyclotrisilicate Ions [Si(6)O(17)](10- ) This work was supported by the Deutsche Forschungsgemeinschaft, the Verband der Chemischen Industrie, the Eidgenössische Technische Hochschule Zürich, the Bundesministerium für Forschung und Technik, and the Adolf-Messer-Stiftung. T.F. and S.H. thank Prof. Dr. D. Günther for the LA-ICP-MS and Dr. V. Shklover (both of the ETH Zürich) for the EDX measurements, C.H. and C.R. thank Mr. M. Idilbi for assistance in the preparative work

Angew Chem Int Ed Engl. 2001 Dec 3;40(23):4398-4400. doi: 10.1002/1521-3773(20011203)40:23<4398::aid-anie4398>3.0.co;2-9.
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