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A novel copper‐based coordination network Cu(1,4‐DPB)(H 2 NBP) was synthesized via a hydrothermal process using 1,4‐di(pyridin‐4‐yl)benzene (1,4‐DPB) and naphthalene‐1,4‐diylbis(hydrogenphosphonate) (H 2 NBP 2– ) as organic linkers. Single‐crystal structure analysis shows that the Cu(II) center exhibits a square‐planar coordination and is surrounded by three oxygen atoms from different hydrogenphosphonate groups as well as a nitrogen atom from the 1,4‐DPB linker. The structure is based on zigzag‐shaped Cu–bisphosphonate double strands that are connected by the organic linkers to form a two‐dimensional coordination network. These layers are organized via hydrogen bonds into a three‐dimensional, two‐fold interpenetrated hydrogen‐bonded framework as a mixed covalent–supramolecular copper–phosphonate network. Thermogravimetric studies reveal a higher thermal stability of the network compared to the free linkers. Photophysical measurements demonstrate complete quenching of the free linker luminescence upon metal coordination in the network.
Fetzer et al. (Mon,) studied this question.