Structure and Magnetic Properties of the Stable Nitroxide 2-Cyano-4,4,5,5-tetramethyl-3-oxide-2-imidazoline-1-oxyl

Crystal and molecular structure of the nitroxide 2-cyano-4,4,5,5-tetramethyl-3-oxide-2-imidazoline-1-oxyl was studied. The nontrivial features of the structure are coplanarity of all atoms of the 2-imidazoline heterocycle and the nitrile group bonded to it and short intermolecular contacts between the nitroxyl O atoms and the C atoms in the 2 position of the heterocycles of the neighboring molecules, actually forming layers in the crystal structure. These data agree with the results of magnetic studies, which are well approximated by the two-dimensional model, which is a rare occurrence for organic magnets.