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Extraction of Ternary Alloys: Synthesis and Crystal Structure of [K([2.2.2]crypt)]Cs 7 [Sn 9 ] 2 (en) 3
Author(s) -
Hauptmann Ralf,
Hoffmann Rudolf,
Fässler Thomas F.
Publication year - 2001
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 - 10.1002/1521-3749(200109)627:9<2220::aid-zaac2220>3.0.co;2-6
Subject(s) - crystallography , chemistry , orthorhombic crystal system , crypt , crystal structure , medicine , endocrinology
The compound [K([2.2.2]crypt)]Cs 7 [Sn 9 ] 2 (en) 3 ( 1 ) was synthesized from an alloy of formal composition KCs 2 Sn 9 by dissolving in ethylenediamine (en) followed by the addition of [2.2.2]crypt and toluene. 1 crystallizes in the orthorhombic space group Pcca with a = 45.38(2), b = 9.092(4), c = 18.459(8) Å, and Z = 4. The structure consists of Cs 7 [Sn 9 ] 2 layers which contain [Sn 9 ] 4– anions and Cs + cations. The layers are separated by [K([2.2.2]crypt)] + units. In the intermetallic slab (Cs 7 [Sn 9 ] 2 ) – compares the arrangement of pairs of symmetry‐related [Sn 9 ] 4– anions with the dimer ([Ge 9 ]–[Ge 9 ]) 6– in [K([2.2.2]crypt)] 2 Cs 4 ([Ge 9 ]–[Ge 9 ]), in which the clusters are linked by a cluster‐exo bond. The shortest distance between atoms of such two clusters in 1 is 4.762 Å, e. g. there are no exo Sn‐Sn bonds. The [Sn 9 ] 4– anion has almost perfect C 4v ‐symmetry.