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The crystal structure of CsBa2Cr2F11: first evidence of vertex-sharing octahedral dimers in fluorides

CsBa 2 Cr 2 F 11 is tetragonal (S.G.: I4/mmm): a=6.048(1) A, c=15.080(2) A, Z=2. The structure was solved from single crystal data using 564 independent reflections (R=0.027, R w =0.030). It consists of isolated [Cr 2 F 11 ] dimers of vertex-sharing bioctahedra separated by cesium (10-fold coordinated) and barium (12-fold coordinated) ions located in an ordered way. The Cs and Ba ions form a three-dimensional subnetwork of cubooctahedra. The structure is compared with that of the hypothetical compound Cs 2 BaCr 2 F 10