Synthesis, spectral and X-ray structural studies of Ni(II) complexes of N′-acylhydrazine carbodithioic acid esters containing ethylenediamine or o-phenanthroline as coligands

The new complexes [Ni(Hbstbh)2(en)] (1) and [Ni(Hpchce)(o-phen)2]Cl·CH3OH·H2O (2) with N′-benzoyl hydrazine carbodithioic acid benzyl ester (H2bstbh) and [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid ethyl ester (H2pchce) have been synthesized, containing ethylenediamine (en) or o-phenanthroline (o-phen) as coligands. The ligands and their complexes have been characterized by elemental analyses, IR, magnetic susceptibility and single crystal X-ray data. [Ni(Hbstbh)2(en)] (1) and [Ni(Hpchce)(o-phen)2]Cl·CH3OH·H2O (2) crystallized in the monoclinic and triclinic systems, space group C2/c   and P-1P-1, respectively. The (N, O) donor sites of the bidentate ligands chelate the Ni(II) center and form a five-membered CN2ONi ring. The resulting complexes are paramagnetic and have a distorted octahedral geometry.

The new complexes [Ni(Hbstbh)2(en)] (1) and [Ni(Hpchce)(o-phen)2]Cl·CH3OH·H2O (2), with N′-benzoyl hydrazine carbodithioic acid benzyl ester (H2bstbh) and [N′-(pyridine-4-carbonyl)-hydrazine]-carbodithioic acid ethyl ester (H2pchce), have been synthesized, containing ethylenediamine or o-phenanthroline as coligands. The (N, O) donor sites of the bidentate ligands chelate the Ni(II) center and form a five-membered CN2ONi ring. Various hydrogen bonds in the crystal structure have stabilized the molecules.Figure optionsDownload as PowerPoint slideResearch highlights
► N′-Aroyl hydrazine carbodithioic acid esters and Lewis bases form complexes with a nickel(II).
► The ester and the neutral Lewis base act as bidentate ligands.
► The (N, O) donor sites of the ligands chelate the Ni(II) forming a five-membered CN2ONi ring.
► The crystal structure are stabilized by N–H⋯S and N–H⋯O hydrogen bonds.