Synthesis and Characterization of Manganese(iv) Complexes Derived From the Direct Reaction of Manganese(ii) Acetate Tetrahydrate With Oxaloyldihydrazide and 2-Hydroxy-1-Naphthaldehyde

Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

“…Hydrazones obtained by the condensation of 2-hydroxy or methoxy aldehydes and ketones with hydrazides are considered potential polynucleating ligands because they have amide, azomethine and phenol or methoxy functions thus offer a variety of bonding possibilities in metal complexes (Sherif and Ahmed, 2010). Nevertheless, a lot of hydrazone-complexes [M = Cu(II), Ni(II), Pd (II), Co(II), Mn(II), V(IV), and ruthenium(II)] have been studied , little chelates of oxaloyldihydrazones have been identified Salavati-Niasari and Sobhani, 2008;Lal et al, 2002. This finding arises from the limited solubility of oxaloyldihydrazones.…”

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

“…Complexes of bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone with a variety of transition metals have been reported [11][12][13][14][15][16][17]. From our laboratory [18], a template synthesis by reaction of Mn(OAc) 2 Á 4H 2 O, oxaloyldihydrazide and 2-hydroxy-1-naphthaldehyde has been carried out in ethanol. But there is no report on the reaction of preformed bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone with Mn(OAc) 2 Á 4H 2 O in methanol under basic conditions.…”

Bis(2-hydroxy-1-naphthaldehyde) oxaloyldihydrazone dihydrate

“…The title compound was synthesised by a modification of the procedure described by Lal et al (2002). A hot aqueous solution (10 ml) of oxaloyldihydrazine (0.12 g, 1.00 mmol) was added to a hot ethanol solution (10 mol) of manganese(II) acetate tetrahydrate (0.25 g, 1.00 mmol) with stirring.…”

“…The mixture was refluxed for 6 h. The volume of the solution was reduced to 10 ml. The brown-orange precipitate of the manganese complex of the title compound (Lal et al, 2002) was filtered off while hot, and dried under vacuum. The dried precipitate (0.05 g) and pyridine (20 ml) were added to a 25 ml Teflon-lined stainless steel acid-digestion vessel and heated at 393 K for 1 d under autogenous pressure.…”