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 suscept ibility measurements show the unpaired electron of [1](+)[BF4](-) (2) to be principally ferrocene-localized; however, the diarylamino moiety Leads to a substantial red shift of the ligand-to-metal charge-transfer transition o f 2 relative to that of ferrocenium.