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Citation: LI Lin-yan, LI Guo-bao, LIAO Fu-hui, LIN Jian-hua. Synthesis and Structure of La[B₅O₈(OH)(H₂O)]NO₃•2H₂O[J]. Acta Physico-Chimica Sinica, ;2005, 21(07): 769-773. doi: 10.3866/PKU.WHXB20050714 shu

Synthesis and Structure of La[B₅O₈(OH)(H₂O)]NO₃•2H₂O

1.
State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871

Received Date: 23 December 2004
Available Online: 15 July 2005

Boric acid is used as a flux and reactant to synthesize a novel hydrated rare earth polyborate, La[B₅O₈(OH)(H₂O)]NO₃•2H₂O. The structure of the title compound is established by single X-ray diffraction data. It crystallizes in monoclinic structures (P21/n) and consists of a double three-membered ring composed of three BO4 and two BO3 groups as the fundamental building block (FBB). The FBB shares four common oxygen atoms with thethe adjacent FBBs producing a borate layer containing nine-membered borate ring window. Lanthanum cations are located around the center of the nine-membered ring. The borate layers are stacked along the b axis and are interlinked by the La－O bond. Nitrate ions and some water molecules are sandwiched between the borate layers. This study further demonstrates that the low temperature synthesis approach by using molten boric acid as a flux is effective for the syntheses of hydrated rare earth polyborates.
- Rare earth borate;Synthesis;Crystal structure
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通讯作者: 陈斌, bchen63@163.com

Synthesis and Structure of La[B₅O₈(OH)(H₂O)]NO₃•2H₂O