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Tantalum Chlorides in Octahedral Cluster Chemistry: The Structures of Cs2PbTa6Cl18 and CsPbTa6Cl18

✍ Scribed by S. Cordier; C. Loisel; C. Perrin; M. Sergent

Book ID: 102603885
Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 338 KB
Volume: 147
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8337

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✦ Synopsis

In the former compound the structure consists of a fcc stacking of Ta 6 Cl 18 units, while a pseudohexagonal AAA stacking of units is observed for the latter compound. The tetrahedral site of units, half-occupied by K ؉ in KLuNb 6 Cl 18 is fully occupied by Cs ؉ in Cs 2 PbTa 6 Cl 18 . The interatomic distances are consistent with valence electron concentrations per cluster (VEC) of 16 and 15 for Cs 2 PbTa 6 Cl 18 and CsPbTa 6 Cl 18 , respectively. It is the 5rst time that such a VEC of 15 is observed for a quaternary Me 6 X 18 -unit based compound; this feature is discussed in relation to the density functional theory results previously reported on Me 6 X 18 (Me ‫؍‬ Nb, Ta; X ‫؍‬ Cl, Br). 1999 Academic Press

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