Manganese (II, III, IV) Complexes of N-(2-hydroxysalicyliden-1-yl) methylenebenzoylhydrazide; Synthesis and Spectral Studies

Reaction of H₂L [N-(2-hydroxysalicyliden-1-yl)methylenebenzoylhydrazide] with manganese(II) acetate tetrahydrate and manganese(III) acetate dihydrate in methanol followed by addition of methanolic KOH results in [Mn(L)2] and [Mn(L)(OH)(H₂O)]. Further, complexes of the composition [Mn(L)(A)][where A = pyridine(py), 2-picoline(2-pic), 3-picoline(3-pic) and 4-picoline(4-pic)] were synthesized from the reaction of H₂L, Mn(OAc)₂.4H₂O, KOH and pyridine bases. The structures of the complexes were confirmed on the basis of elemental analysis, molar conductivity, magnetic moment, FT-IR, UV-Visible and ESR spectra. The molar conductance values in DMF (N,Ndimethylformamide) suggest non-electrolytic nature of the complexes. Electronic spectral studies suggest 6-coordinate and 4-coordinate metal ions in these complexes. IR spectra reveal that H2L coordinates in enol-form in its complexes.