A New Sulfur-containing Schiff-Base Ligand and Binding to Copper(II) and Cobalt(II)

A new Schiff-base ligand having a potentially coordinating thioether group (2-quinoline-N-(2'-methylthiphenyl)methyleneimine, qmtpm) has been prepared. The synthesis, structure, UV-Vis and EPR studies of one copper(II) and two cobalt(II) complexes from this ligand is reported. The X-ray structures Of the Cu-II and Co-II chlorido complexes 1 and 2 reveal the metal atoms in highly distorted square-pyramidal environments constituted of one tridentate ligand and two anions. On the other hand, the thiocyanato COII compound 3 exhibits a distorted trigonal-bipyramidal structure. These structural variations are apparently due to the different counter-ions which leads to distinct lattice interactions. The spectroscopic data obtained by EPR and UV-Vis investigations are in agreement with the solid-state structures of the coordination compounds.