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Si 9 4– Anions in Solution – Structures of the Solvates Rb 4 Si 9 ·4.75NH 3 and [Rb(18‐crown‐6)]Rb 3 Si 9 ·4NH 3 , and Chemical Bonding in Si 9 4– (Eur. J. Inorg. Chem. 31/2009)
Author(s) -
Joseph Stefanie,
Suchentrunk Christof,
Kraus Florian,
Korber Nikolaus
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200990084
Subject(s) - chemistry , liquid ammonia , crystallography , ternary operation , crystal structure , alkali metal , ammonia , silicon , ion , rubidium , inorganic chemistry , potassium , organic chemistry , computer science , programming language
The cover picture shows significant parts of the crystal structures of Rb(18‐crown‐6)Rb 3 Si 9 ·4NH 3 and Rb 4 Si 9 ·4.75NH 3 . On the left, the coordination sphere of the nonasilicide anion in the 18‐crown‐6‐containing compound is shown. The second structural part shows the Rb‐ammonia‐nonasilicide strands found in the crystal structure of Rb 4 Si 9 ·4.75NH 3 . The existence of these thermally labile ammoniates demonstrates that it is possible to extract Si 9 4– anions from a ternary solid‐state material into a liquid ammonia solution without further oxidation. This opens the door to chemical transformations of bare electron‐rich silicon clusters. The ELF picture on the left shows that no evidence for three‐center, two‐electron bonding can be found, although the Wade–Mingos–Williams rules obviously apply for the prediction of the molecular shape of the anions. Details are discussed in the article by N. Korber et al. on p. 4641 ff.