(C5H6N)4[Be6(HPO3)8]·H2O: A low-density open-framework beryllium phosphite with multidirectional 12-ring channels

• A novel beryllium phosphite was hydrothermally synthesized.
• Pyridine solvent serves as a template in microporous materials.
• The structure features (3,4)-connected network with a new topology.
• Multidirectional 12-ring channels were observed in the structure.

Employing the common pyridine (=py) solvent as the source of structure-directing agents (SDAs), a novel three-dimensional open-framework beryllium phosphite (Hpy)4[Be6(HPO3)8]·H2O (1), has been solvothermally synthesized and structurally characterized by IR, elemental analysis, thermogravimetric analysis, powder and single-crystal X-ray diffractions. It crystallizes in the orthorhombic system, space group Pbca (No. 61), a = 20.0034(4) Å, b = 20.2188(4) Å, c = 20.9731(3) Å, V = 8482.5(3) Å3, and Z = 8. The alternating connection of BeO4 tetrahedra and HPO3 pseudopyramids give rise to a (3, 4)-connected network with multidirectional intersecting 12-ring channels. The compound possesses a low density and a new {4.8.10}{42.6.8.10.12}{42.6}3{42.8.102.12}{43.62.8} topology.

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