Preparation and study of bis(theophyllinato) copper(II) compounds

Bis(theophyllinato) copper(II) dihydrate and its anhydrous form, were prepared. Their thermal, spectral and magnetic behaviours were investigated. Magnetic susceptibility studies show that the dihydrate form can be fitted to the Curie law. The magnetic behaviour of the anhydrous form is interpreted in terms of antiferromangetically exchange-coupled pairs of copper atoms. The change in magnetic properties as the dihydrate is dehydrated implies that structural rearrangement in first coordination sphere of copper accompanies the dehydration process. For bis(theophyllinato)copper(II) dihydrate we propose a pseudo octahedral coordination of copper(II) in a polymeric chain, and for the anhydrous form four-coordination in binuclear units.