Abstract

Ab initio and semi-empirical molecular orbital calculations are carried out for clusters of nitroxide radicals. The intermolecular effective exchange integrals calculated are positive (ferromagnetic) in the case of appropriately stacked forms of these species. Implications of the calculated results are discussed in relation to the ferromagnetic intermolecular interactions observed for nitroxide radicals such as para-nitrophenyl nitronyl nitroxide.

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