title: [Ge=Ge](4-) Dumbbells in the Zintl Phase Li3NaGe2.
abstract: Ge-Ge double bonds: The reaction of elemental lithium, sodium, and germanium at 750 °C results in the Zintl phase Li3NaGe2 , which, according to the Zintl-Klemm concept, contains [Ge=Ge](4-) dumbbells with unprecedented short Ge-Ge distances. Based on structural, spectroscopic, and theoretical considerations, convincing evidence is given that Ge-Ge double bonds are in fact present.
authors.affiliation: Institut für Anorganische Chemie, Universität zu Köln, Greinstraße 6, 50939, Köln, Germany. uwe.ruschewitz@uni-koeln.de.
authors.forename: Uwe
authors.initials: U
authors.lastname: Ruschewitz
keywords: alkali metals; double bonds; germanides; solid-state chemistry; zintl phases