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Mononuclear Manganese(IV) Complexes Derived from Polyfunctional Fumaryldihydrazone

A series of mononuclear manganese(IV) complexes of disalicylaldehyde fumaroyldihydrazone (slfhH4)
were synthesized by reacting manganese acetate tetrahydrate with dihydrazone in absence and presence
of various pyridine bases in methanol medium. Pyridine (py) and its derivatives like 2-picoline (2-pic),
3-picoline (3-pic), 4-picoline (4-pic), 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen) were added
to the reaction mixture of metal salt and dihydrazone to explore the binding possibilities of these
molecules to manganese center. The elemental analysis, mass spectral and thermal studies were used
to derive their composition. Study of magnetic moment, molar conductances, electronic, EPR and
infrared spectroscopy have led to interpretation of their tentative structures. Magnetic moment and
EPR studies correspond to their Mn(IV) oxidation state. The dihydrazone functions as tetradentate
ligand chelating the manganese(IV) ion present in octahedral geometry with anti-cis configuration in
enol form. Electrochemical and antimicrobial studies were also performed.