Abstract
AbstractThe reaction of warm methanolic solution of M(OAc)2 · nH2O (M = CoII, NiII, MnII, and ZnII) with S‐methylisothiosemicarbazide‐hydrogeniodide and sodium pyruvate yielded the neutral octahedral bis(ligand) complexes [M(HL)2] · 3 H2O, where HL is the monoanion of the terdentate NNO ligand, pyruvic acid S‐methylisothiosemicarbazone. The complexes of CoII, Ni II and MnII have the μeff values corresponding to a high‐spin state of the central ion. By oxidizing the ammoniacal solution of the CoII complex a weakly paramagnetic NH4[CoIIIL2] · 1.5 H2O complex was prepared, in which L stands for the dianion of the same ligand, formed as a result of deprotonation (apart from the carboxylic group) of the NH2 group. The complexes have been characterized by elemental analysis, magnetic measurements, i.r. and diffuse‐reflectance spectra, molar conductivity, and TG analysis.
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