Magnesium(II), Calcium(II), and Barium(II) Coordination Compounds Constructed by 1H-Tetrazolate-5-acetic Acid Ligand

Reactions of H2tza (H2tza = 1H-tetrazolate-5-acetic acid) with Mg(NO3)2.6H2O, Ca(NO3)2.4H2O, or Ba(NO3)2 with the presence of KOH under hydrothermal conditions, produced three new coordination compounds, [M(tza)(H2O)2] (M = Mg (1), Ca (2), Ba (3)). These compounds were structurally characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Compounds 1 and 3 display 2D structures, whereas 2 reveals a 1D structure with bridging tza ligand molecules as linkers. Furthermore, the luminescence properties of 13 at room temperature in the solid state were also investigated. The results show that the nature of metal ions play an important role in governing the molecular frameworks of 13, and the strong coordinate abilities of carboxylate and tetrazolate group, endow tza with abundant coordination modes.