Magnetic susceptibility and electron spin resonance studies on amine–copper(II) arylcarboxylates

Abstract

Magnetic-susceptibility and e.s.r. data are reported for compounds of the type Cu(RCO₂)₂ L (where RCO₂ is an arylcarboxylate and L is aniline or pyridine). The results for the antiferromagnetic compounds have been analysed on both the Bleaney–Bowers and Jotham–Kettle models. The pyridine derivatives have singlet–triplet separations in the range 290–355 cm^–1. Four aniline derivatives have been prepared in which the singlet–triplet separations are 250–335 cm^–1; these results are contrasted with earlier work which showed the interval to be reduced to ca. 100 cm^–1 in aniline derivatives of copper(II) alkylcarboxylates.