Coexistence of two aromatic bicarboxylate ligands with distinct conformations in a fluorescent zinc(II) polymer

A new zinc compound, [Zn3(DPA)2(BDC)]n (1, H2DPA = diphenic acid and H2BDC = benzene-1,4-dicarboxylic acid), has been hydrothermally prepared and characterized. It illustrates an unusual three-dimensional architecture containing two organic aromatic bicarboxylate ligands with distinct configurations. Moreover, this polymer exhibits strong photoluminescence at room temperature, and the main emission band is at about 390 nm with λex = 337 nm in the solid state at room temperature.