Structure-Magnetism Relationships inα-Nitronyl Nitroxide Radicals

Abstract

Statistical analysis of the packing of all known α-nitronyl nitroxide crystals (see diagram) with dominant ferro- and antiferromagnetic properties shows that there are no differences in the geometrical distribution of the NO⋅⋅⋅ON, C(sp3)−H⋅⋅⋅O−N and C(sp3)−H⋅⋅⋅O−N contacts in these two subsets. The magnetic properties are a result of the relative orientation of the molecules, that is, of their packing patterns (or synthons) and not of the geometry of an individual contact.