H2InB5O10: A New Pentaborate Constructed from 2D Tetrahedrally Four-Connected Borate Layers and InO6 Octahedra

• Published in: European Journal of Inorganic Chemistry 2010, Vol.2010 (11), p.1703-1709
• Main Authors: Cong, Rihong, Yang, Tao, Li, Hongmei, Liao, Fuhui, Wang, Yingxia, Lin, Jianhua
• Format: Review
• Language: English
• Subjects: Borates; Hydrogen bonds; Indium; Network structures; X-ray diffraction
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.200901078

H2InB5O10, a new hydrated indium pentaborate, was prepared by the boric acid flux method and characterized by IR, solid‐state 11B MAS NMR and 1H CRAMPS NMR spectroscopy. Its structure was determined by powder X‐ray diffraction and refined by Rietveld analysis. H2InB5O10 crystallizes in the monoclinic space group C2. The structure features a new 2D tetrahedrally four‐connected borate network constructed from a new pentaborate fundamental building block, B5O14. The 2D borate network is formed by two 63 borate layers linked by additional BO4 groups in a spiro‐5 mode and then combines with InO6 octahedra to give rise to the 3D structure of H2InB5O10. The strong hydrogen bonds that cross‐link oxygen atoms of additional BO4 groups between the borate layers help to stabilize the borate network. The structure of H2InB5O10 is made up of InO6 octahedra layers and 2D tetrahedrally four‐connected borate layers. The 2D borate network, formed by two 63 borate layers combined with additional BO4 groups in a spiro‐5 mode, exhibits a new pentaborate fundamental building block, B5O14. The strong hydrogen bonds that cross‐link oxygen atoms inside the 2D borate layer help to stabilize the network.