Synthesis, spectral and structural studies of a Mn(II) complex of [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid ethyl ester and Mn(II) and Ni(II) complexes of [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid methyl ester

The new complexes [Mn(Hpchce)2(o-phen)], {2[Mn(pchcm)(o-phen)2]}·7H2O and [Ni(Hpchcm)(o-phen)2]Cl·CH3OH with [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid ethyl ester (H2pchce) and [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid methyl ester (H2pchcm) have been synthesized, containing o-phenanthroline (o-phen) as a coligand. These ligands and their complexes have been characterized by elemental analyses, IR, magnetic susceptibility and single crystal X-ray data. H2pchce (2), [Mn(Hpchce)2(o-phen)] (3) {2[Mn(pchcm)(o-phen)2]}·7H2O (4) and [Ni(Hpchcm)(o-phen)2]Cl·CH3OH (5) crystallized in the monoclinic system, space group Pc, C2/c, P21/n and P21/n, respectively. The (N, O) donor sites of the bidentate ligands chelate the Mn(II) and Ni(II) centers forming a five-membered CN2OM ring. The resulting complexes are paramagnetic and have a distorted octahedral geometry.

The new complexes [Mn(Hpchce)2(o-phen)], {2[Mn(pchcm)(o-phen)2]}·7H2O and [Ni(Hpchcm)(o-phen)2]Cl·CH3OH with [N′-(pyridine-4-carbonyl)hydrazine]-carbodithioic acid ethyl ester (H2pchce) and [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid methyl ester (H2pchcm) have been synthesized, containing o-phenanthroline (o-phen) as a coligand. The (N, O) donor sites of the bidentate ligands chelate the Mn(II) center to form a five-membered CN2OM ring. Various hydrogen bonds in the crystal structures stabilise the molecules.Figure optionsDownload as PowerPoint slide