Synthesis and characterization of manganese(IV) and ruthenium(III) complexes derived from bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone.

Singh, Mahesh K.; Kar, Nirmal K.; Lal, Ram A.

Bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone(naohH4) interacts with manganese(II) acetate in methanol followed by addition of KOH giving [MnIV(naoh)(H2O)2]. Activated ruthenium(III) chloride reacts with naohH4 in methanol yielding [RuIII(naohH4)Cl(H2O)Cl2]. The replacement of aquo by heterocyclic nitrogen donor in these complexes has been observed when the reaction is carried out in presence of heterocyclic nitrogen donors such as pyridine(py), 3-picoline(3-pic) or 4-picoline(4-pic). The molar conductance values in DMF for these complexes suggest non-electrolytic nature. Magnetic moment values suggest 4 oxidation state for manganese in its complexes, however, ruthenium(III) complexes are paramagnetic with one unpaired electron. Electronic spectral studies suggest six coordinate metal ions. IR spectra reveal that naohH4 coordinates in enol-form and keto-form to manganese and ruthenium, respectively. ESR and cyclic voltammetric studies of the complexes have also been reported.

MANGANESE; RUTHENIUM; TRANSITION metals; PLATINUM group; SPECTRUM analysis

Journal of Coordination Chemistry, 2008, Vol 61, Issue 19, p3158

0095-8972

Academic Journal

10.1080/00958970802010583