SI1           Abdou Khadri Diallo, Jaime Ruiz, Didier Astruc*     1 H and 13 C NMR of [(η 5 %C 5 H 4 CO 2 Me)Fe(η 6 %toluene)][PF 6 ], ……………………..SI2  1 H and 13 C NMR of [(η 5 %C 5 H 4 CO 2 CH 2 CCH)Fe(η 6 %toluene)][PF 6 ], ………………SI3  1 H and 13 C NMR of [(η 5 %C 5 H 4 CONHCH 2 C 6 H 5 )Fe(η 6 %toluene)][PF 6 ], …………...SI4  1 H and 13 C NMR of [(η 5 %C 5 H 4 NHCH 2 C 6 H 5 )Fe(η 6 %toluene)][PF 6 ], ……………….SI5  1 H and 13 C NMR of [Fe 2 Fv((η 6 %toluene) 2 ][PF 6 ] 2 (Fv=  2 %η 5 , η’ 5 %fulvalenyl), ……SI6  1 H and 13 C NMR of [(η 5 %C 5 H 5 )Fe(η 5 %C 5 H 4 CO 2 Me)], ……………………………..SI7  1 H, 13 C and 31 P NMR of [(η 5 %C 5 H 5 )Fe(η 5 %C 5 H 4 PPh 2 )], …………………………...SI8  1 H, 13 C and 29 Si NMR of [(η 5 %C 5 H 5 )Fe(η 5 %C 5 H 4 SiMe 2 CH 2 Cl)], ………………...SI10  1 H and 13 C NMR of [(η 5 %C 5 H 4 COMe)Fe(η 5 %C 5 H 4 CO 2 Me)], …………………….SI11  1 H, 13 C and 29 Si NMR of [(η 5 %C 5 H 4 COMe)Fe(η 5 %C 5 H 4 SiMe 2 CH 2 Cl)], ……….SI13  1 H and 13 C NMR of [(η 5 %C 5 H 4 CO 2 H)Fe(η 5 %C 5 H 4 COMe)], …………………….SI15  1 H, 13 C NMR and mass spectrum of [(η 5 %C 5 H 4 CO 2 CH 2 CCH)Fe(η 5 %C 5 H 4 CO 2 Me)], …………………………………………………………………………………...SI16  1 H, 13 C NMR and mass spectrum of [(η 5 %C 5 H 4 CONHCH 2 C 6 H 5 )Fe(η 5 %C 5 H 4 CO 2 Me)], …………………………………………………………………………………...SI18  1 H, 13 C NMR and mass spectrum of [(η 5 %C 5 H 4 Cl)Fe(η 5 %C 5 H 4 CO 2 Me)], ………SI20  1 H, 13 C NMR and mass spectrum of [(η 5 %C 5 H 4 Me)Fe(η 5 %C 5 H 4 COMe)], ……...SI22  1 H, 13 C NMR and mass spectrum of [(η 5 %C 5 H 4 NHCH 2 C 6 H 5 )Fe(η 5 %C 5 H 4 CO 2 Me)], …………………………………………………………………………………...SI24  1 H, 13 C NMR of [(η 5 %C 5 Me 6 )Fe(η 5 %C 5 H 4 CO 2 Me)], ……………………………SI26  1 H, 13 C NMR of [(η 5 %C 5 H 4 CO 2 Me) 2 Fe 2 Fv] (Fv=  2 %η 5 , η’ 5 %fulvalenyl), ……..SI27  1 H, 13 C NMR of [(η 5 %C 5 H 4 COMe) 2 Fe 2 Fv] (Fv=  2 %η 5 , η’ 5 %fulvalenyl), ……...SI28  ! 13 C NMR, mass spectrum and cyclic voltammogram of [1,4%C 6 H 4 (CH 2 Fc) 2 ] (Fc= C 10 H 9 ), ………………………………………………………………………………SI29