Cobalt phthalocyanine ( Na 2.8 CoPc ) organic molecular ferromagnets with a Curie temperature higher than room temperature were synthesized. By means of EXAFS spectroscopy the nearest coordinational environment of the Co ion was examined in both Na 2.8 CoPc and pristine β- CoPc as well as in standard substances containing metallic cobalt. The nearest coordinational environment of the Co ion in ferromagnetic Na 2.8 CoPc is shown to remain virtually invariable as compared with that in pristine β- CoPc . This environment is conditioned by the nitric and carbonic coordination spheres of the phthalocyanine and differs essentially from the nearest coordinational environment of Co in metallic cobalt. The results of EXAFS studies serve as direct structural evidence that the nature of the ferromagnetism in Na 2.8 CoPc is conditioned by the organic matrix, namely by ( CoPc )2− and ( CoPc )3− anions with unpaired π-electrons in the 7 e g doubly degenerate MO of the conjugated phthalocyanine macro-ring.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.