Abstract
The magnetic behavior of planar bibridged copper(II) halide dimers, trimers, and tetramers are summarized. The planar oligomers exhibit antiferromagnetic coupling. Dimeric Cu2X62 ions can undergo one of two types of distortions: a tetrahedral twist distortion and a bifold, or sedia, distortion. Both distortions cause the exchange interaction to become ferromagnetic. Trimeric species have a S = 1/2 ground state. Evidence for non-Boltzman depopulation of the excited quartet state is observed and is tentatively assumed to arise from frustrated intertrimer interactions. Comparison of the X = Cl and X = Br salts show that the antiferromagnetic contribution to the exchange coupling is approximately twice as large for the bromide salts as for the chloride salts. It is also seen that the coupling becomes more antiferromagnetic as the length of the oligomer increases.
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