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Tetrahedral [Tt 4 ] 4– Zintl Anions Through Solution Chemistry: Syntheses and Crystal Structures of the Ammoniates Rb 4 Sn 4 ·2NH 3 , Cs 4 Sn 4 ·2NH 3 , and Rb 4 Pb 4 ·2NH 3
Author(s) -
Wiesler Katharina,
Brandl Karoline,
Fleischmann Andrea,
Korber Nikolaus
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200801249
Subject(s) - alkali metal , chemistry , crystallography , tin , ion , dissolution , crystal structure , inorganic chemistry , liquid ammonia , cluster (spacecraft) , molecule , caesium , ammonia , organic chemistry , computer science , programming language
The crystalline isotypic solvates Rb 4 Sn 4 ·2NH 3 , Cs 4 Sn 4 ·2NH 3 , and Rb 4 Pb 4 ·2NH 3 have been synthesized using the direct reduction of elemental tin or tetraphenyltin, respectively, with heavier alkali metals or the dissolution of the binary phase RbPb in liquid ammonia. These compounds contain the cluster ions [Sn 4 ] 4– or [Pb 4 ] 4– respectively. This is the first time that[Tt 4 ] 4– ions (Tt = tetrels) are detected as result of a solution reaction. The accommodation of the ammonia molecules, which build up ion‐dipole interactions to alkali metal cations, requires some modifications of the crystal structures compared to the binary phases RbSn, CsSn, and RbPb. The tetrahedral [Tt 4 ] 4– anions have a slightly lower coordination by Rb + or Cs + cations and, furthermore, the intercluster distances show a remarkable increase.