Structures of mixed ligand copper(II) complexes coordinating through S,O and N. E.p.r. studies

Summary The formation of near square planar mixed ligand Cu^II complexes with diethyldithiocarbamate (dtc) as one of the ligands and 8-hydroxyquinolinate (Hy) or salicylaldehydate (Sal) as the second ligand by exchange reactions, has been detected by e.p.r. spectroscopy. The concentrations of the mixed ligand complexes in the reaction mixtures are small compared to those of the reactants. Six different tests were used to identify the m₁=3/2,⁶³Cu hyperfine transition of the near square planar complexes, based upon the relative concentrations of the different Cu^II species in the reaction mixture, ligand hyperfine structures, the minium linewidths observed in a temperature dependent study and the isotropic g₀ estimated from the e.p.r. spectra in solution.