Synthesis and characterization of three open-framework zinc phosphites with (3,4)-connected frameworks

摘要

By using different monoamines as the structure-directing agents, three new open-framework zinc phosphite compounds, [C_4H_(10)ON]_2[Zn_3(HPO_3)_4] (1), [CH_3CH_2NH_3]_2-[Zn_3(HPO_3)_4] (2) and [H_2N(CH_3)_2)_2-[Zn_3(HPo_3)_4] (3), have been synthesized under hydro/solvothermal conditions. The three compounds have different (3,4)-connected frameworks constructed from strictly alternating Zno_4 tetrahedra and HPO_3 pseudo pyramids. The presence of 12-ring channels in their structures is noteworthy. The removal of organic cations in the free voids of compound 1 by an ion-exchange process will make the structure collapse.