Synthesis, crystal structure and luminescence of two barium(II) compounds: from mono- to bis-tetrazole carboxylic acids

摘要： Tetrazole carboxylates are acknowledged as bifunctional ligands for the construction of new coordination architectures. Two new coordination compounds, [Ba(atzpa)2(H2O)3]n·2nH2O (1) and [Ba2(dtzpda)(H2O)]n (2) have been prepared by solvothermal reactions of BaCl2·2H2O with Hatzpa or H4dtzpda, respectively (Hatzpa = 5-aminotetrazole-1-propanoic acid, H4dtzpda = 3,3-di(1H-tetrazol-5-yl)pentanedioic acid). The X-ray diffraction results reveal that compound 1 is a linear chain in which atzpa acts as a tridentate ligand to bridge adjacent Ba2+ ions in a μ1,1,3-COO mode. In contrast, compound 2 is a three-dimensional network where dtzpda4? acts as a dode-dentate ligand to bridge various Ba2+ ions. Furthermore, the luminescence of Hatzpa, H4dtzpda, compounds 1 and 2 in the solid state at room temperature were investigated.