Two polymorphs of a new barium borate, α- and β-Ba 3 [B 10 O 17 (OH) 2 ], have been synthesized through hydrothermal reactions at 500 °C and 1000 bar and their structures determined by single-crystal X-ray diffraction. The 3D framework structure of the α-form is formed of two different fundamental building blocks (FBB) with the descriptors 4Δ6□:-<3□>-<2Δ□>|-<3□>-<2Δ□>| and 2Δ3□:<Δ2□>-<Δ2□>. The former FBB is unique and contains unusual edge-sharing BO 4 tetrahedra. The β-form has a double layer structure which is formed of two stereoisomers of a pentaborate polyanion with the descriptor 2Δ3□:<Δ2□>-<Δ2□>. Within a double layer, one sheet composed of FBBs in l configuration is connected by sharing tetrahedral vertices to the other sheet of FBBs in d configuration. The α-form is the first compound with edge-sharing BO 4 tetrahedra synthesized in aqueous solution under hydrothermal conditions.
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Lii, K. (Contributor), Lee, Y. (Contributor), Tsai, C. (Contributor) & Jen, I. (Contributor), The Cambridge Structural Database, 1 Apr 2019
Jen, I. (Contributor), Lii, K. (Contributor), Tsai, C. (Contributor) & Lee, Y. (Contributor), The Cambridge Structural Database, 1 Apr 2019