Acta Crystallographica Section E: Crystallographic Communications (Mar 2019)
Crystal structure of Ba2Co(BO3)2
Abstract
Single crystals of dibarium cobalt(II) bis(orthoborate), Ba2Co(BO3)2, have been obtained from the melt. The crystal structure is composed of two isolated (BO3)3− triangles linked to Co2+ cations. The resulting [CoO5] square pyramids and the borate anions make up branched rows extending parallel to [010]. The barium cations occupy two sites in the voids of this arrangement and exhibit coordination numbers of nine each. A comparison with the structures of other A2M(BO3)2 compounds reveals a unique five-coordination of the small metal M in the title compound instead of four- or six-coordination for the other A2M(BO3)2 compounds with M = Cu, Zn, Mg, Ca, or Cd.
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