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Two novel 3D borates: porous-layer and layer-pillar frameworks

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Abstract

Two new borates, NaK1.5[B{B5O9(OH)}{B5O8(OH)2}1/2] (1) and Na3.5[Al{B3O6(OH)}{B5O10}1/2{BO(OH)}] (2), have been made by a solvothermal method. Structure 1 is made of two types of oxoboron clusters ([B5O9(OH)]4− and [B5O8(OH)2]3−) and BO4 tetrahedra to form a 3D porous layer, in which the [B5O9(OH)]4− clusters are bridged by BO4 groups to produce a 2D B–O layer with 11-membered ring (MR) windows, while the [B5O8(OH)2]3− clusters as 2-connected pillars join the adjacent B–O layers to make a 3-D porous layer. Structure 2 is built from two types of oxoboron clusters ([B3O6(OH)]4− and [B5O12]9−), AlO4 units and BO2(OH) triangles to produce 3D pillar-layered aluminoborate (ABO), in which the [B5O12]9− clusters are linked together to form a 2-D B–O layer; the [B3O6(OH)]4− clusters and AlO4 groups join each other to form 1D tubular ABO; and the BO2(OH) triangles act as linkers to connect the adjacent B–O layer and the ABO tubes, resulting in 3D pillar-layered ABO. Interestingly, the ABO tubes decorated with the BO2(OH) triangles act as pillars to make a 3D layer-pillared structure. UV-vis diffuse spectra indicate that both have cut-off edges below 190 nm, and the calculated band gaps are 5.75 and 5.78 eV, respectively.

Graphical abstract: Two novel 3D borates: porous-layer and layer-pillar frameworks

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Article information


Submitted
30 Sep 2019
Accepted
28 Oct 2019
First published
29 Oct 2019

Dalton Trans., 2020, Advance Article
Article type
Paper

Two novel 3D borates: porous-layer and layer-pillar frameworks

D. Qin, T. Zhang, C. Ma and G. Yang, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT03867A

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