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Two isostructural transition-metal (TM) triphosphonates decorated with neutral rigid N-containing ligands 1,3,5-tris(1-imidazolyl)benzene (tib), [Zn(L1)(tib)]·8HO (1) and [Co(L1)(tib)]·9HO (2) (HL1 = N(CHPOH)), nitrilotris(methylenephosphonic acid), have been solvothermally prepared and structurally characterized by infrared spectroscopy, elemental analysis, thermogravimetric analysis and single-crystal/powder X-ray diffraction. The title compounds exhibit a pillar-layer structure with the TM-triphosphonates as layers and the rigid tib ligand as a pillar. The luminescence and magnetic properties have been investigated. Compound 1 exhibits intense blue luminescence, while compound 2 shows weak ferromagnetic behaviour.

We report herein a 3D interrupted beryllium phosphite open-framework with a low density (1.594 g cm−3), which is the first case of a beryllium phosphite framework containing extra-large 18-ring channels.

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