Solvent Formula E1/2 (V) (FeCp20/+ vs SCE, 0.1 M NBu4PF6 at 298 K) Acetonitrile CH3CN 0.40,[1] 0.382[2] Dichloromethane CH2Cl2 0.46,[5] 0.475[6] Tetrahydrofurane THF 0.56,[5] 0.547[6] Dimethylformamide DMF 0.45,[5] 0.470[6] Acetone (CH3)2C=O 0.48[5] Dimethylsulfoxide DMSO 0.435[6] Dimethylether DME 0.51,[5] 0.580[6]