The 3d electrons of chromium(III) and the unpaired electron of the nitroxide radical interact ferro- and antiferro-magnetically in chloro-meso-tetraphenylporphyrinatochromium(III) ligated with 3- and 4-(N-oxy-N-tert-butylamino)pyridines to produce quintet and triplet ground states, respectively.
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Kitano et al. (1994) studied this question.
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