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Synthesis and Structure of (NH4)2[(AuI4)(MI4)] (M = Ga, In)

✍ Scribed by E. Schulz Lang; U. Abram; J. Strähle; E. M. Vázquez-López

Publisher
John Wiley and Sons
Year
1999
Tongue
German
Weight
89 KB
Volume
625
Category
Article
ISSN
0372-7874

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✦ Synopsis

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) A Ê ; (NH 4 ) 2 [(AuI 4 )(InI 4 )], a = 12.587(2), b = 20.606(5) and c = 7.696(2) A Ê . 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.

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