THE MAGNETIC-PROPERTIES OF FERROCENE BASED MACROMOLECULES

Magnetic susceptibility data for conjugatively linked biferrocenes and a methylene bridged ferrocene polymer are presented. In 9,10-di((2-fe rrocenyl)vinyl)anthracene a rigid divinylanthracene bridge is connecti ng two ferrocene units, and the oxidation of both iron centers leads t o an antiferromagnetic coupling. In contrast, ferromagnetic coupling b etween iron centers is indicated for 2,2'-cis,trans-di((2-ferrocenyl)v inyl)biphenyl, where a twist around the phenylphenyl bond in the divin ylbiphenyl bridging molecule is likely to occur.