PH Dependent Synthesis of Two Manganese Compounds based on 5-(2-Pyrimidyl)tetrazole-1-acetic Acid

Abstract

Reactions of Hpymtza [Hpymtza = 5-(2-pyrimidyl)tetrazole-1-acetic acid] with MnCl 2 ·4H 2 O under different pH conditions, afforded the complexes [Mn(pymtza) 2 (H 2 O) 4 ] (1) and [Mn 2 (pymtza) 2 Cl 2 (EtOH)]·H 2 O (2). The compounds were structurally characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Compound 1 shows a mononuclear structure, whereas complex 2 has a 1D chain structure. In compound 1, the pymtza ligand only acts in a monodentate manner to coordinate to one central Mn II atom by one carboxylate atom, In 2, pymtza acts as tetradentate ligand to connect three Mn II ions. Compounds 1 and 2 display 3D networks by hydrogen bonding interactions. Furthermore, the luminescence properties of Hpymtza as well as compounds 1 and 2 were investigated at room temperature in the solid state.