title: 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.
authors.affiliation: Eduard-Zintl-Institut, Anorganische Chemie II Technische Universität Darmstadt Petersenstrasse 18, 64287 Darmstadt (Germany).
authors.forename: Stefan
authors.initials: S
authors.lastname: Hoffmann
authors.forename: Thomas F.
authors.initials: TF
authors.lastname: Fässler
authors.forename: Constantin
authors.initials: C
authors.lastname: Hoch
authors.forename: Caroline
authors.initials: C
authors.lastname: Röhr