Some antiferromagnetic, anionic cupric acetate complexes

Abstract

Compounds of stoicheiometry (R₄N)Cu(CH₃CO₂)₂X (X = NCS, NO₂, or Br) have been prepared and their spectral and magnetic properties have been studied. The infrared spectra of the compounds where X^–= NCS^– or NO₂^– are in agreement with co-ordination of these anions as isothiocyanato- and nitrito-groups, respectively. The compounds display antiferromagnetism, and it is suggested that the anions may have the dimeric structure of cupric acetate monohydrate, with the X^– ions replacing the water molecules. The preparation of the compound Cu(CH₃CO₂)₂·Ph₃AsO is also reported, and this has a low magnetic moment at room temperature.