Abstract
NaSr 2CrF 8 is monoclinic (space group P2 1 c ) with a = 7.7388(6) Å, b = 6.2756(5) Å, c = 14.827(2) Å, β = 112.03(1)°, and Z = 4. The structure was solved from single crystal data using 2341 independent reflections ( R = 0.040, R w = 0.043). Chromium ions are in octahedral sites while two strontiums and one sodium atoms are respectively, in eight-, nine-, and sixfold coordination. The structure is characterized by isolated [CrF 6] 3− octahedra between which sodium and strontium atoms and two independent fluorine ions are located. Cationic tetrahedra (3Sr 2+ + Na +) around independent fluorine ions form double chains, running in the [010] direction, with formula [F 2NaSr 2] 3 n+ n . Structural correlations with CsCu 2Cl 3 are given.
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