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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
NaSn2: a novel binary Zintl phase with 2D polyanions of Realgar-type units [Sn8]4-
Franck Dubois1, Martin Schreyer, Thomas F Fässler
1Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
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.
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