Electron spin resonance study of some copper(II) dithiocarbamates and their mixed-ligand complexes

Abstract

The e.s.r. spectra of seven copper(II) dithiocarbamates have been recorded in chloroform–ethanol mixtures at room temperature and at 113 K. It has been found that the addition of a range of salts to these dithiocarbamates destroys the complex forming a mixed-ligand complex, [Cu(S₂CNR₂)X], with a new e.s.r. spectrum. When X is Cl or Br the additional interaction of the unpaired electron with a single halogen nucleus is observed. The [Cu(S₂CNEt₂)Cl] complex forms a dipole–dipole coupled dimer and a computer simulation of the ΔM_s= 2 absorption of this dimer has been obtained.