Synthesis, Structure, Magnetic Properties, and Catalase- like Activity of Methoxy- bridged Manganese( III) Coordination Polymer containing Hydrazone based ( O, N, O) 2-Donor Ligand

A 1D coordination polymer of manganese(III) with a hydrazone-based ligand, [Mn2(L)(μ-OCH3)2(OHCH3) 2]n (1), was synthesized and characterized by elemental analyses and spectroscopic methods {H4L = bis[(2-hydroxynaphthalen-1- yl)methylene]adipohydrazide}. The crystal structure of 1 was determined by X-ray crystallography. The two dianionic domains of the ligand adopt trans configuration, and each coordinates in a tridentate mode via the O, N, O′-donor atoms to a MnIII ion forming a dinuclear compound. The methoxy ligands provide an asymmetric bridge between two central manganese atoms, which lead to the formation of a 1D coordination polymer. A 2D supramolecular structure is formed by hydrogen bonding interactions between the 1D chains. Although the methoxy ligands are labile, the polymer preserves its oligonuclearity in the solution. Temperature-dependent magnetic susceptibility studies proved the presence of a weak antiferromagnetic interaction between manganese(III) ions with J = -3.2 cm-1, which results from axial distortion of the manganese coordination environment. Compound 1 showed catalase-like activity in disproportionation of H2O2. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.