Solvothermal syntheses and structures of four indium–phosphite coordination polymers

Abstract

Four new indium–phosphite coordination polymers [C₃H₁₂N₂][In₂(HPO₃)₄] (denoted as InHPO-CJ11), [C₃H₁₂N₂][InF(HPO₃)₂] (denoted as InHPO-CJ12), In₂(HPO₃)₃ (denoted as InHPO-CJ13) and [C₄H₁₂N₂][In₄(HPO₃)₇(H₂O)₃] (denoted as InHPO-CJ14) have been solvothermally synthesized in the presence of mixed solvents. Single-crystal structure analysis reveals that InHPO-CJ11 displays a novel (3,6)-connected three-dimensional (3D) structure containing multi-directional intersecting 8-ring channels and unique left/right-handed helical chains. InHPO-CJ12 has a 1D chain-like structure constructed by InO₆ and HPO₃ units. Notably, the syntheses of these two compounds are similar except for the use of hydrofluoric acid. InHPO-CJ13 possesses a 3D inorganic framework with 12-ring channels without occluded organic templates, which is built up by connection of In₂O₁₀ face-shared dimers and pseudo pyramidal HPO₃. InHPO-CJ14 exhibits a pillared-layer structure with intersecting 12-ring channels along [100], [010] and [110] directions. These compounds are further characterized by SEM, powder XRD, ICP, CHN, TGA and IR analyses.