Syntesis and Crystal Structure of Cs2Nb6Br5F12: A Nb6 Cluster Compound with a One-Dimensional Nb6Bri5Fi7Fa6 Unit Connection

✍ Scribed by S. Cordier; O. Hernandez; C. Perrin

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 534 KB
• Volume: 163
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9418

✦ Synopsis

The synthesis and the crystal structure of Cs 2 Nb 6 Br 5 F 12 containing octahedral niobium clusters are presented in this work. This bromo6uoride is based on a Nb 6 L i 12 F a 6 (L : Br and F) unit and crystallizes in the orthorhombic system (space group, Cccm; Z : 4; a : 9.2446(2) A s , b : 13.6256(3) A s , and c : 17.1665(4) A s ; R : 0.0241). Fluorine and bromine are randomly distributed on the inner ligand positions, L i , that edge-bridge the Nb 6 cluster whereas 6uorine fully occupies the apical positions (L a ). The units are linked to each other by apical ligands leading to an original one-dimensional unit connection. The cesium atoms are statistically distributed on several sites that describe parallel channels along the [1 0 0] direction. The in6uence of 6uorine ligands upon the stabilization of this structure type as well as the structural relationships with Ba 2 Zr 6 Cl 17 (B), Nb 6 F 15 , and NaMo 6 Cl 13 will be evidenced and discussed.