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Transition metal Complexes with the Thiosemicarbazide‐based Ligands. VII. Complexes of some 3d elements with pyruvic acid S‐methylisothiosemicarbazone
Author(s) -
Leovac V. M.,
Češljević V. I.,
Obadović D. Ž.,
Petrović D. M.,
Yu. Chundak S.
Publication year - 1989
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19895700119
Subject(s) - chemistry , deprotonation , ligand (biochemistry) , perchlorate , electron paramagnetic resonance , molar conductivity , octahedron , transition metal , metal , medicinal chemistry , inorganic chemistry , paramagnetism , nickel , crystallography , stereochemistry , ion , crystal structure , elemental analysis , organic chemistry , catalysis , nuclear magnetic resonance , biochemistry , physics , receptor , quantum mechanics
The reaction of warm methanolic solution of M(OAc) 2 · nH 2 O (M = Co II , Ni II , Mn II , and Zn II ) with S‐methylisothiosemicarbazide‐hydrogeniodide and sodium pyruvate yielded the neutral octahedral bis(ligand) complexes [M(HL) 2 ] · 3 H 2 O, where HL is the monoanion of the terdentate NNO ligand, pyruvic acid S‐methylisothiosemicarbazone. The complexes of Co II , Ni II and Mn II have the μ eff values corresponding to a high‐spin state of the central ion. By oxidizing the ammoniacal solution of the Co II complex a weakly paramagnetic NH 4 [Co III L 2 ] · 1.5 H 2 O 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 NH 2 group. The complexes have been characterized by elemental analysis, magnetic measurements, i.r. and diffuse‐reflectance spectra, molar conductivity, and TG analysis.