Group II metal-directed structural variation of coordination compounds derived from 5-[N-acetato(4-pyridyl)]tetrazolate ligand

Reactions of MCl2 (M = Mg, Ca, Sr, Ba) and a4-ptz (a4-ptz = 5-[N-acetato (4-pyridyl)] tetrazolate) potassium salt in water, respectively, and produced four new complexes [Mg(H2O)6] · (a4-ptz)2 · 2H2O (1), [Ca(a4-ptz)2(H2O)2]n · 2nH2O (2), [Sr(a4-ptz)2(H2O)2]n · 2nH2O (3), [Ba4(a4-ptz)8(H2O)8]n · 4nH2O (4). These compounds were structurally characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Compound 1 has mononuclear structure bearing distinct intermolecular hydrogen-bond interactions to form a three-dimensional supramolecular network. While compounds 2–4 have one-dimensional polymeric chains that are bridged by two water molecules linker, respectively. The luminescence properties of 1–4 were investigated at room temperature in the solid state.