The InSnCl3-Type Arrangement: I. A New ABX3 Structure Type with Close Cation–Cation Contacts

✍ Scribed by H.P. Beck; H. Tratzky; V. Kallmayer; K. Stöwe

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 367 KB
• Volume: 146
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8360

✦ Synopsis

We report on the synthesis and structure of InSnCl 3 and InSnBr 3 . Their structure represents a new ABX 3 structure type which will only be found for compounds with large cations A and B having an ns 2 electron con5guration. The cations have high coordination numbers and therefore their coordination polyhedra are connected mainly by common edges and even faces. This leads to fairly short cation}cation distances. However, the electrostatic repulsion may be decreased by a shielding e4ect of the s-electrons. The distribution of the cations on di4erent sites, which cannot be determined by routine X-ray investigations, is discussed on the basis of crystal chemical considerations. Low temperature di4raction measurements on InSnCl 3 show that the high symmetry of the arrangement is mimicked by a polydomain con5guration, which can be dealt with by a split atom re5nement.