CRYSTAL-STRUCTURE AND MAGNETIC-PROPERTIES OF PYRIDYL-SUBSTITUTED NITRONYL NITROXIDES

X-ray crystal structure and cryomagnetic properties of three organic r adicals, 4,5-dihydro-l-H-imidazol-1-oxyl-3-N-oxide(NIT-oPy) 1, 4,5-dih ydro-1-H-imidazol-1-oxyl-3-N-oxide(NIT-mPy) 2 and -dihydro-1-H-imidazo l-1-oxyl-3-N-oxide(NIT-6M-oPy) 3 were investigated. The crystal struct ures of compounds 1-3 show the same feature of a P2(1)/c space group o f a monoclinic system. Two crystallographically independent molecules were found in the crystals of compounds 1-3. The temperature dependenc e of magnetic susceptibility of compounds 1-3 revealed an intermolecul ar antiferromagnetic exchange interaction.