New Dinuclear Methoxo-Bridged Manganese(III) complex: Synthesis, Characterization and Usage as New Precursor for Synthesis of Mn2O3 Particles

Abstract

New dinuclear methoxo-bridged manganese(III) complex [Mn₂((MeO-bph)en)₂Cl₂(m-CH₃O)₂] (<strong>1</strong>) was synthesized by template reaction of 2-hydroxy-4-methoxybenzophenone, 1,2-ethanediamine and MnCl₂×6H₂O with molar ration (1:1:1) in methanol as solvent. The title compound <strong>1</strong> was characterized by elemental analyses (CHN), Fourier Transform infrared spectroscopy (FT-IR) and single crystal X-ray diffraction. X-ray result reveal that <strong>1</strong> is dimeric with methoxo bridges between two symmetry equivalent manganese ions. The Mn ions are surrounded in a distorted octahedral geometry influenced by Jahn-Teller effect. The tridentate Schiff base ligand MeO-bp-en and one of the methoxo-bridges bind in the equatorial mode, whereas in the axial positions, other metoxo-bridge and Cl atom bind to the Mn ions. Thermogravimetric analysis of <strong>1</strong> was studied and display the title compound <strong>1</strong> decompose in three stages. Finally, by calcination of <strong>1</strong> at 500 °C for 3 h, we prepared Mn₂O₃ particles and characterized by FT-IR, XRD and SEM.