Hydrothermal synthesis and structural characterization of an organically-templated zincophosphite: [C_4N_2H_(12)]_(0.5)·[Zn_3(HPO_3)_4]·H_3O

摘要

A new three-dimensional organically templated [C_4N_2H_(12)]_(0.5)·[Zn_3(HPO_3)_4]·H_3O was hydrothermally synthesized and characterized by single crystal X-ray diffraction. The three-dimensional framework is built up from two-dimensional layers with 4.8-membered rings and one-dimensional chains of 4-membered rings. The structure ahs strictly alternating ZnO_4 tetrahedra and HPO_3 pseudo pyramids which are linked through their vertices giving rises to the three-dimensional architecture with 8,12-membered ring channels. The protonated water moleculaes and diprotonated piperazine are located in the 8-membered and 12-membered channels, respectively. The compound crystallizes in monoclinic system, space group P2_1 with cell parameters, a = 9.6739(16) A, b = 8.4528(13) A, c = 20.257(4) A, beta = 97.966(5) deg, Z = 4, R = 0.023, and R_w = 0.060. It was characterized by the powder X-ray diffraction, differential thermal-thermogravimetric analyses, IR spectroscopy and proton-decoupled ~(31)P MAS NMR solid-state spectroscopy.