Synthesis and characterization of a new organically templated open-framework beryllium phosphite with 3, 4-connected networks

•A new organically templated beryllium phosphite was hydrothermally synthesized.•Interesting 8- and 12-ring channels coexist in the structure.•The framework were constructed from heptameric [Be3(HPO3)4] clusters.•The 3D network features a 6-connected pcu topology.

Employing diethylenetriamine (=dien) as a structure-directing agent, a new open-framework beryllium phosphite H2dien·Be3(HPO3)4 (1), has been synthesized hydrothermally and structurally characterized by single crystal X-ray diffraction. The structure of 1 features a (3, 4)-connected framework with 8- and 12-ring channels, which is constructed from strictly alternating BeO4 tetrahedra and HPO32− pseudopyramids. The 3-D framework possesses a pcu topology when the heptameric [Be3(HPO3)4] clusters are regarded as 6-connected secondary building units. Crystal data: 1, monoclinic, C2/c (no. 15), a = 8.7350(3) Å, b = 15.1704(6) Å, c = 13.0851(4) Å, β = 101.223(5)°, V = 1700.79(10) Å3, Z = 4, R1 = 0.0625, wR2 = 0.1692.

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