1,2-Diferrocenylethane From an Unusual Reaction

Comparison of the bis(ferrocenylethynyl)phenylmethylium cation with bis(ferrocenylethenyl)methylium analogues

“…3) could potentially be due to a ferrocenium-containing product (k max for unsubstituted ferrocenium and for [FcCCH] + are 628 and 698 nm, respectively, in dichloromethane [49]); this is consistent with NMR spectra which reveal appearance of a paramagnetic species. The same UV-Vis-NIR spectrum is obtained on addition on ethereal tetrafluoroboric acid to III in dichloromethane, but decays more rapidly than that generated using CF 3 CO 2 H. The formation of ferrocenium products is reminiscent of that observed for many mononuclear ferrocenyl carbocations where the reactivity can be understood in terms of a redox tautomer in which the ferrocene is oxidised and the ''carbocation'' center is a radical; for example, the dimagnetic Fe II species [FcCH 2 ] + has been shown to dimerise to the paramagnetic Fe III dimer [FcCH 2 CH 2 Fc] 2+ [54].…”

Synthesis, structures and reactions of some metallocene alcohols

“…a-Ferrocenylcarbocations are well-known to slowly dimerise to paramagnetic 1,2-bis(ferroceniumyl)ethanes, [16,[55][56][57][58] which can be reduced to the corresponding neutral species. 1,2-Bis(metallocenyl)ethanes may also be obtained under acidic reducing conditions from a-ferrocenylalcohols [59,60], a-ferrocenylalkoxides [61], or vinylferrocenes [62], or from direct reduction of the a-metallocenylcarbocations [12].…”

Enzyme electrodes based on sono-gel containing ferrocenyl compounds

“…All the reagents were of analytical grade and were used without further purification. The biferrocene 1,2-diferrocenylethane was prepared as described in the literature (Rinehart et al, 1959); methyl trimethoxysilane (hereinafter abbreviated MTMOS, Merck) and graphite powder (spectroscopic grade RBW, SGL Carbon Ringsdorff, Germany) were used as purchased. All potassium-phosphate buffers (KPB) were prepared with water obtained from a Milli-Q system (Millipore).…”