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The Crystal Structure of Ba2CuAlF9: a New Structure Type in Copper Fluoride Chemistry

✍ Scribed by Nathalie Dupont; Patrick Gredin; Stéphanie Fouquet; Ariel de Kozak

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

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✦ Synopsis

Ba 2 CuAlF 9 is monoclinic: a = 5.374(2) A Ê , b = 7.312(2) A Ê , c = 9.371(3) A Ê , b = 90.20(1)°, Z = 2, space group P2 1 /c (n°14). The crystal structure was solved from X-ray single crystal data using 1071 unique reflections (900 with F o /r(F o ) > 4, R factor = 0.075). It is built up from infinite isolated cis chains of [MF 6 ] mixed occupied fluorine octahedra sharing each, one edge and one vertex (M is randomly Cu or Al). An analogous kind of linkage was already observed for two other compounds from the ternary system BaF 2 /CuF 2 / AlF 3 . Close structural relationships exist between the cationic subnetworks of c-BaAlF 5 and Ba 2 CuAlF 9 .

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