NACDALF6 - A NEW STRUCTURE WITH [ALF5]N2N- CHAINS AND INDEPENDENT F-

Crystals of NaCdAlF6 are orthorhombic (space group Pnma) with a = 12.506(1) Å, b = 3.6406(6) Å, c = 9.902(1) Å, and Z = 4. The structure was solved from single crystal data using 982 independent reflections (R = 0.019, Rw = 0.019). Aluminum octahedra form a new arrangement of linear trans-connected [AlF5]2nn chains, running in the [010] direction, between which sodium and cadmium ions, in six- and seven-fold coordination, respectively, and an independent fluorine ion are located. Cationic tetrahedra (3 Cd2+ + 1 Na+) around independent fluorine ions form chains of formula [FNaCd]2nn, running in the [010] direction. © 1990.