title: Heteroatomic Si/Ge Zintl clusters: single-crystal structure determination of Rb4[Si7.8Ge1.2](NH3)5 and [Rb([18]crown-6)Rb3][Si7.5Ge1.5](NH3)4.
authors.affiliation: Department Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Waibel
authors.forename: Christian B
authors.initials: CB
authors.lastname: Benda
authors.forename: Bernhard
authors.initials: B
authors.lastname: Wahl
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Fässler