title: Bi-Zn bond formation in liquid ammonia solution: [Bi-Zn-Bi]4-, a linear polyanion that is iso(valence)-electronic to CO2.
abstract: Reactions of the zinc(I) complex [Zn2(Mesnacnac)2] (Mesnacnac = [(2,4,6-Me3C6H2)NC(Me)]2CH) with solid K3Bi2 dissolved in liquid ammonia yield crystals of the compound K4[ZnBi2]⋅(NH3)12 (1), which contains the molecular, linear heteroatomic [Bi-Zn-Bi](4-) polyanion (1 a). This anion represents the first example of a three-atomic molecular ion of metal atoms being iso(valence)-electronic to CO2 and being synthesized in solution. The analogy of the discrete [Bi-Zn-Bi](4-) anion and the polymeric ∞(1)[(ZnBi4/2)(4-)] unit to monomeric CO2 and polymeric SiS2 is rationalized.
authors.affiliation: Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany).
authors.forename: Christian B
authors.initials: CB
authors.lastname: Benda
authors.forename: Tobias
authors.initials: T
authors.lastname: Köchner
authors.forename: Raphaela
authors.initials: R
authors.lastname: Schäper
authors.forename: Stephan
authors.initials: S
authors.lastname: Schulz
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Fässler
keywords: Zintl ions; bismuth; carbon dioxide; solid-state structures; zinc