An electron spin resonance study of dimer formation by copper(II) dialkyldithiocarbamates in various solvent mixtures

Abstract

The e.s.r. spectra of copper(II) dialkyldithiocarbamates in frozen solutions of chloroform containing small amounts of other solvents have been shown to give a well resolved signal at g ca. 2 and 77°K superimposed on a broader line while at the same instrument gain a signal at low field is observed. The broad signal at g ca. 2 and the lines at half-field have been interpreted as arising from ΔM= 1 and ΔM= 2 transitions, respectively, occurring as the result of dimer formation. Solution of a spin Hamiltonian including dipole–dipole terms and the application of computer simulation of the line-shapes have enabled the distance of 4·7 ± 0·4 Å between the copper(II) ions in the dimer to be determined. A structure of the dimer is considered which would be compatible with this distance.