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Synthesis and Structure of (NH 4 ) 2 [(AuI 4 )(MI 4 )] (M = Ga, In)
Author(s) -
Lang E. Schulz,
Abram U.,
Strähle J.,
VázquezLópez E. M.
Publication year - 1999
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/(sici)1521-3749(199902)625:2<359::aid-zaac359>3.0.co;2-n
Subject(s) - orthorhombic crystal system , crystallography , chemistry , octahedron , zigzag , crystal structure , stereochemistry , geometry , mathematics
The compounds (NH 4 ) 2 [(AuI 4 )(MI 4 )] (M = Ga, In) were obtained in sealed glass ampoules by reaction of I 2 , NH 4 I, Au and Ga or In as air‐sensitive black crystals. Both compounds crystallize in the orthorhombic space group Pnma (No. 62) and are isotypic: (NH 4 ) 2 [(AuI 4 )(GaI 4 )], a = 12.619(2), b = 20.625(5) and c = 7.693(2) Å; (NH 4 ) 2 [(AuI 4 )(InI 4 )], a = 12.587(2), b = 20.606(5) and c = 7.696(2) Å. The structures can be described as constituted of NH 4 + cations and anionic zig zag chains of alternating tetrahedral MI 4 – (M = In, Ga) and square planar AuI 4 – units running along [010]. Within the chains, the MI 4 – ions form weak interactions with two of their I atoms to the AuI 4 – ions resulting in strongly elongated AuI 6 octahedra.