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

Abstract

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.

Approaching the structure of REBaB9O16 (RE = rare earth) by characterization of a new analogue Ba6Bi9B79O138

“…A similar sandwiched layer structure built of metal-centered octahedra and two BO 4 layers has been reported for H 2 InB 5 O 10 , 30 while the inter-layer connections are different. As shown in Fig.…”

“…S3 in ESI, † the inter-layer distance in H 2 InB 5 O 10 is short and allows the insertion of a BO 4 monolayer. 30 The inter-layer distance in BBBO is much longer, and is probably the longest in layered-type metal borates. Polyborate anions interconnect the adjacent sandwiched layers into a three-dimensional structure (see Fig.…”

Structural Regulations of Layered Borates: From Centric Layers to Chiral Porous Layers

“…Though the removal of CO 3 2– closed the interlayered distance, the positions and orientations of the −OH groups were not suitable for hydroxyl condensations based on the current B 5 O 10 (OH) cluster. Pentaborate clusters (B 5 O n ) have various derived configurations with different combinations of BO 3 triangles and BO 4 tetrahedra, − which can be regulated by different cationic charges. If more terminal BO 3 triangles could be replaced with BO 4 tetrahedra, there may be potential axial B–O–B linkages to expand dimensions.…”

Structure−Property Relationships in Lithium, Silver, and Cesium Uranyl Borates

“…These BO 3 and BO 4 units can further polymerize to create larger borate clusters by sharing common corners to create clusters, one-dimensional chains, two-dimensional sheets, and three-dimensional framework structures . Because there is a vast number of different topological arrangements of the polyborate anions, the solid-state and materials chemistry of borates is virtually unsurpassed. , Borates can be divided into three groups: main group and transition metal borates, − lanthanide and actinide borates, − organic and transition metal complex templated borates . Recent interest in borates has focused on mixed oxoanion systems that include BOP, BOGe, BOAl, BOGa , and BOIn systems, with a clear effort to prepare microporous zeolitic materials with new catalytic, ion exchange, and sorption properties.…”