Structure and Chemical Bonding in K14Cd9Tl21, a Compound Containing Both Isolated Tl7-11 Clusters and 2[Cd9Tl7-10] Metallic Layers

✍ Scribed by Monique Tillard-Charbonnel; Abdelkrim Chahine; Claude Belin; Roger Rousseau; Dr. Enric Canadell; Dr. R. Rousseau

• Book ID: 102792906
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 955 KB
• Volume: 3
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.19970030520

✦ Synopsis

The compound K14Cd,T12, has been prepared by fusion of the elements in a tantalum reactor followed by slow cooling at the rate of 6" per hour to enable crystal growth. The X-ray crystal structure (hexagonal, P62m; u = 9.884(3), c = 17.173(5) %.; Z = 2) was refined to reliability factors of R 1 = 5.09, w R 2 = 11.64%. The anionic substructure contains both isolated clusters of T1: ; and a layered network based on Cd,Tl, pentagonal bipyramids. The structure-electron count relationship for the TI:; cluster was analyzed in detail. The Cd,TI:, layers are found to confer metallic properties to the material, and the bonding within such layers is found to be highly delocalized. Keywords cadmiumclusters * layered compoundssemiempirical calculationsthallium . Zintl phases 0 VCH ~r l a ~s h r e . ~e / l . ~~l i ~~f t mbH, D-69451 IVeinhcitn. 19Y7 OY47-SS39/97/U3US-~SOZ d 17.50+ .SO/O Cizem.