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organic compounds
The crystal structure of a nitroxide radical exhibiting ferromagnetic exchange interactions is described. The closest NONO contact in 4,4′,4′′4′′′-[1,2,4,5-benzenetetrayltetrakis(carbonyloxy)]tetrakis(2,2,6,6- tetramethyl-1-piperidinyloxy) involves an orthogonal arrangement of two nitroxide groups, leading to a ferromagnetic exchange interaction.