Abstract
Low temperature specific heat and magnetic susceptibility studies were carried out on polycrystalline pellets of three copper(II) complexes of 1.4-diazacycloheptane having different geometries. Above 4 K, the specific heat can be described by the relation: C = αT 3 which allows the determination of Debye temperatures for the investigated systems. Below 4 K, the specific heat rises very fast and goes through a maximum at T max suggesting weak antiferromagnetic interactions. These findings are substantiated by the Curie-Weiss behavior in the ac susceptibility results and by the general features of the M vs. H curves.
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