Stabilization of manganese(III) in aqueous medium. Synthesis and spectral characterization of new mixed-ligand fluoromanganate(III) containing dicarboxylic and hydroxy-carboxylic acids as co-ligands

Department of Chemistry, Tripura University, Suryamaninagar-799 022, West Tripura, India

E-mail : rndp09@gmail.com

Manuscript received 06 October 2010, revised 05 May 2011, accepted 20 June 2011

Fluoride assisted stabilization of manganese(m) has been demonstrated by synthesizing new mixed-ligand fluoromanganate(lll) complexes from aqneous medium. Mixed-ligand fluoromanganate(lll) complexes have been synthesized from a reaction of MnO(OH), 40% HF with corresponding co-ligands in aqueous medium in presence of alkali metal carbonate. Newly synthesized complexes are stable in absence of moisture and are insoluble in organic solvents. Complexes were characterized on the basis of elemental analyses, chemical determination of oxidation state, FTIR, electronic spectra, room temperature magnetic moment measurements, TGA/DTA, SEM, EDX and cyclic voltammctry studies. The synthesized complexes are likely to have distorted octahedral structure.