Clusters of the Heavier Elements of Main Groups 14-16: A Novel Synthetic Route for Polyanions in Molten Crown Ether

Author： Fässler Thomas F. Hoffmann Rudolf

ISSN： 0009-4293

Source： CHIMIA International Journal for Chemistry, Vol.52, Iss.4, 1998-04, pp. : 158-159

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Abstract

A novel procedure allows the synthesis of homoatomic polyanions directly from the elements E (E = Sn, As, Sb, Te) in molten A/18-crown-6 as reaction medium (A = K, Rb) at temperatures between 40 and 80° [1]. The reactions are carried out by adding E to mixtures of A and 18-crown-6 that proved to form stable melts under these conditions. Further work off using ethylenediamine or DMF as solvent yielded single crystals of the following compounds: [K(18-crown-6)]₄Sn₉ (1), [K(l8-crown-6)₃KSn₉·en (2), [K(18-crown-6)₃As₇ (3), [K([2.2.2]crypt)₂[K(l8-crown-6)]Sb₇·0.5en (4), [Rb(18-crown-6)₃Sb₇ (5), [K(l8-crown-6)]₂Te₄ (6), and [K(l8-crown-6)]₂Te₄·en (7). In all compounds short contacts between the Zintl ions and A-atoms are observed. The influence of cation-anion interactions on the structure of these anions is discussed.