Chemical Physics Letters, Vol.344, No.3-4, 305-309, 2001
Magnetic exchange coupling in tetranuclear copper clusters of the type [Cu-4 (mu O-4) Cl6-nBrnL4]
The magnetic susceptibility Of [Cu4OCl6-nBrnL4] type tetranuclear complexes (L=morpholine) has been recorded and analysed using models that account for a decreased symmetry. Although the structural distortions are rather low, a symmetry descent to S-4 is ultimate for a successful fitting of the magnetic data. On a systematic substitution of Cl for Br atoms a decrease of the 'intradimer' coupling constants is registered.