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Abstract
The temperature dependence of the magnetic susceptibility between 115 and 370°K has been determined for fourteen 1:2 addition complexes formed from copper(II) halides and pyridine or a substituted pyridine. The susceptibility-temperature data has been fit to the Curie-Weiss Law and values of φ in the range −9 to −43°K have been determined. From a knowledge of the structure of the complex the Weiss constant can be used to estimate the magnitude and sign of the exchange interaction. These results are compared with those obtained previously for 1:1 addition complexes formed from copper(II) chloride and bidentate heterocyclic amines. Plausable mechanisms for spin exchange in the two types of complexes are discussed.
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