Ligational behavior of S, N, and O donor quinoxaline derivatives toward the later first-row transition metal ions

Ligands derived from quinoxaline-2,3-(1,4H)-dithione are treated with Co(II), Ni(II), Cu(II), and Zn(II) chlorides to yield stable complexes. The prepared compounds are characterized by spectro-analytical techniques and magnetic susceptibility measurements, and the coordination behavior of ligands is discussed. All the complexes are octahedral and mononuclear with general formula [MLCl2(H2O)]. The electrochemical behavior of the synthesized compounds was investigated by cyclic voltammetry studies and the redox activity is explained.