Synthesis and Properties of a (Diarylamino)ferrocene and Its Radical Cation

(Di- p -tolylamino)ferrocene ( 1 ) was synthesized using Pd-catalyzed C−N bond formation; it is oxidized at −250 mV vs ferrocene in THF. Magnetic susceptibility measurements show the unpaired electron of [ 1 ] + [BF 4 ] - ( 2 ) to be principally ferrocene-localized; however, the diarylamino moiety leads to a substantial red shift of the ligand-to-metal charge-transfer transition of 2 relative to that of ferrocenium.