title: NaSn2: a novel binary Zintl phase with 2D polyanions of Realgar-type units [Sn8]4-.
abstract: NaSn2, obtained from the reaction of stoichiometric amounts of the elements, crystallizes in a new structure type, in which two-dimensional polyanions are separated by Na+ cations. The tin framework is made up of Realgar-type Sn8 units. The density of states obtained from the TB-LMTO-ASA calculations with the implementation of the electron localization function (ELF) reveals that NaSn2 has all characteristics of a Zintl phase. Thus, the title compound can be written as (Na+)4(2infinity)[Sn8(4-)]. NaSn2 dissolves readily in ethylenediamine, under the formation of a reddish brown solution indicative of the presence of [Sn9](4-) anions.
authors.affiliation: Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
authors.forename: Franck
authors.initials: F
authors.lastname: Dubois
authors.forename: Martin
authors.initials: M
authors.lastname: Schreyer
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Fässler