The First Gallium Borophosphate NaGa[BP2O7(OH)3]:Synthesis and Crystal Structure Characterization

Borophosphates, as potential microporous materials, have drawn much attention in recent years and show rich chemistry^[1-3]. Although many compounds with transition metals have been reported, compounds with the p-block main group elements participating in the framework are rare^[4] The title compound has been synthesized by mild hydrothermal methods and crystal structure characterized by X-ray single crystal methods. Crystallographic data:monoclinic,C2/c (No. 15), a=10.408(3), b=8.094(2),c=9.099(2) Å, β=116.64(2), Z=4, R=0.0246,Rw=0.0676. The crystal structure contains isolated anions[(OH)O₂P_1/2-O_1/2B(OH)₂O_1/2-O_1/2PO₃]^4-. Geometrically, four GaO₆ groups with four PO₄ groups form an eight-member ring by sharing comers resulting to a two dimensional layer in be plane. The layers are joined by BO₄ group through comer sharing with GaO₆ and PO₄ and result to a three dimensional network structure. A 350pm x 600pm open channel along c-axis can be seen (figure below) and occupied by Na cations.