ABSTRACT
The chemistry of coordination compounds of transition metals with stable nitroxides is one of the more modern and actively developed directions in inorganic chemistry. Research results, syntheses, and applications of metal complexes with nitroxides are covered in reviews and monographs. Interest in the solid-phase magnetism of these compounds grew sharply after O. P. Anderson and T. C. Kuechler had shown that nitroxyl group (NG) coordination by a paramagnetic metal ion may not involve spin pairing of metal ion and NG paramagnetic centers. Attention is focused on the complexes where the solid phase undergoes NG coordination by the paramagnetic metal ion. The structure of nitronyl nitroxides is favorable for bridge coordination of paramagnetic ligands, being a symmetric structure with actually two equivalent donor N-O groups. Solid phases of complexes with bifunctional nitroxides are considerably more stable in storage and in handling in a study than complexes with monofunctional nitroxides.
