Table 2. Redox Potentials of the Tromancenium Ions of This Study and the Parent Troticene, Trovacene and Trochrocene^a,^b.

compdb	Eox	Ered	solvent	further redox processes
[(Cht)Mn(Cp)]+ (9)	+0.70c	–1.61d	DMF	associated reduced form gives rise to a chemical follow product, which oxidizes at –0.52 V
[(MeCht)Mn(Cp)]+ (10)	+0.69c	–1.62d	DMF	associated reduced form gives rise to a chemical follow product, which oxidizes at –0.55 V
[(Cht)Mn(CpMe)]+ (11)	+0.68c	–1.66d	DMF	associated reduced form gives rise to a chemical follow product, which oxidizes at –0.54 V
[(Cht)Mn(CpCOOMe)]+ (18)	+0.88c	–1.46d	CH3CN	associated reduced form gives a chemical follow product, which oxidizes at –0.44 V; further irreversible reduction peak at –2.50 V
[(Cht)Mn(CpBr)]+ (19)	+0.93d	–1.49e	DMF	associated reduced form gives rise to a chemical follow product, which oxidizes at –0.31 V
[(Cht)Mn(CpNH2)]+ (20)	+0.40	–1.33	DMF	additional oxidation wave at +0.65 V and reduction peaks at –1.84 V and –3.16 V
[(Cht)Ti(Cp)]	–0.01d	–2.70e	THF	associated reduced form gives rise to a chemical follow product, which oxidizes at –2.47 V and regenerates the starting complex23b
[(Cht)Ti(Cp*)]	–0.18d	–2.78e	THF	associated reduced form gives rise to a chemical follow product, which oxidizes at –2.56 V23b
[(Cht)V(Cp)]	–0.23	–3.04	DME	further, chemically irreversible 2e– oxidation at ca. +0.61 V23b
[(Cht)Cr(Cp)]	–1.10	–3.38e	DME	associated anion rapidly forms (η6-C7H8)CrCp by proton abstraction; further oxidation as a chemically irreversible process at +1.10 V23b

^aPotentials are given in volts and are calibrated against the Cp₂Fe^0/+ redox couple.

^bCht = η⁷-cycloheptatrienyl, Cp = η⁵-cyclopentadienyl.

^cHalf-wave potential of a chemically only partially reversible process.

^dPeak potential of a chemically irreversible redox process.

^ePotential calibration against the Cp₂Fe^0/+ redox couple.^24c