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Binary alkali metal compounds with the zintl anions [Ge 9 ] 4− and [Sn 9 ] 4−
Author(s) -
Von Schnering H. G.,
Baitinger M.,
Bolle U.,
CarrilloCabrera W.,
Curda J.,
Grin Y.,
Heinemann F.,
Llanos J.,
Peters K.,
Schmeding A.,
Somer M.
Publication year - 1997
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.19976230704
Subject(s) - thermogravimetric analysis , crystallography , alkali metal , crystal structure , cluster (spacecraft) , phase (matter) , zintl phase , metal , germanide , chemistry , materials science , germanium , silicon , organic chemistry , computer science , programming language
The binary germanides M 12 Ge 17 and M 4 Ge 9 (M Na, K, Rb, Cs) and the stannides M 12 Sn 17 and M 4 Sn 9 (M K, Rb, Cs) were identified by a combination of direct synthesis, thermogravimetric analysis, vibrational spectroscopy, X‐ray powder data and single crystal structure analysis. The M 12 E 17 phases contain the cluster anions [E 9 ] 4− and [E 4 ] 4− in the ratio 1:2, forming a hierarchical structure with the cluster anions at the atomic positions of the hexagonal Laves phase MgZn 2 . Like the M 4 E 4 phases, the M 4 Ge 9 compounds are hierarchical derivatives of the cubic Cr 3 Si structure but with [Ge 9 ] 4− anions. The thermogravimetric analyses give strong evidence for the existence of at least one more phase with [E 9 ] 4− and [E 4 ] 4− clusters and of the clathrate phases M 6 E 136 in addition to the well‐known M 8 E 44 □ 2 chlathrates.