Vertex‐sharing BO4 and PO4 tetrahedra form the framework of the title compounds. Ca[BPO5] and Sr[BPO5] crystallize in the stillwellite structural type and contain tetrahedral chain anions [BPO], which can be described as loop‐branched “dreier” single chains. In Ba3[BP3O12] the tetrahedral anions form “zweifach” open “vierer” single chains. Given these results and the known linking modes of tetrahedral units, it is expected that borophosphates with layered and framework structures, as well as microporous structures, can be found.

Fe(H2O)2BP2O8·H2O, an ordered zeotype hydrated ferriborophosphate, was synthesized by a mild hydrothermal method. Its structure was characterized by single-crystal X-ray diffraction which has ordered, alternating, vertex-sharing BO4, PO4, and FeO4(H2O)2 groups.

No abstract

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