Hydrothermal synthesis of three-dimensional open-framework beryllium phosphites with 3,4-connected networks

Two new beryllium phosphites, H2en·Be3(HPO3)4 (1) and H2pda·Be3(HPO3)4 (2), have been synthesized under hydrothermal conditions. Single-crystal structural analyses reveal that both compounds have three-dimensional inorganic frameworks constructed from strictly alternating BeO4 tetrahedra and HPO3 pseudo pyramids. The structure of compound 1 can be described as a pillared layered structure with 12-ring channels. The structure of compound 2 has an interesting sqp topology if Be3(HPO3)4 clusters are regarded as 5-connected nodes in the network.

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► Three-dimensional open-framework beryllium phosphites have been synthesized.
► Beryllium phosphites with different 3,4-connected frameworks.
► Be3(HPO3)4 clusters have been organized into a unique sqp network.
► Different diamines have been used as the structure-directing agents.