. 2021 Nov 11;12(48):16035–16053. doi: 10.1039/d1sc02963k

Ground state absorption and redox properties. Extinction coefficient (ε) at peak wavelength (λ) and peak energy (E), potentials of first oxidation (E_1/2 Fe^III/II) and first reduction (E_p L^0/−).

Complex^a	λ ^b (nm)	E ^b (eV)	ε ^b (10³ M⁻¹ cm⁻¹)	E _1/2 Fe^III/II ^c (V)	E _p L^0/− ^c^,^d (V)
[Fe(pbmi)₂]²⁺	456	2.71	15	0.31^e	−2.39^e
[Fe(cpbmi)₂]²⁺	515	2.41	23^f	0.45^e (0.22)^g	−1.71^e
[Fe(cpbmi)(dtapbmi)]²⁺	511	2.42	16	0.26 (0.17)^g	−1.63^h, −2.38
[Fe(cpbmi)(daapbmi)]²⁺	512	2.42	14	0.25 (0.19)^g	−1.7^h, −2.3
[Fe(dtapbmi)₂]²⁺	459	2.70	34	0.06	−2.52
[Fe(daapbmi)₂]²⁺	454	2.73	32	0.05	−2.58

As PF₆⁻ salt.

In acetonitrile buffered with 0.1 M TBA methanesulfonate and 0.1 M methanesulfonic acid.

Vs. Fc⁺/Fc in acetonitrile with 0.1 M TBAPF₆.

DPV peak potential of irreversible wave.

From ref. 55.

This is a higher value than previously published,^54,55 attributed to the fact that the protonated complex has higher extinction at 515 nm than the deprotonated complex.

Potential of first oxidation of the complex adsorbed on a TiO₂ film (using the same procedure as for DSSC fabrication, see ESI.9) immersed in acetonitrile with 0.1 M TBAPF₆.

Minor reduction peak.

Ground state absorption and redox properties. Extinction coefficient (ε) at peak wavelength (λ) and peak energy (E), potentials of first oxidation (E1/2 FeIII/II) and first reduction (Ep L0/−).

Ground state absorption and redox properties. Extinction coefficient (ε) at peak wavelength (λ) and peak energy (E), potentials of first oxidation (E_1/2 Fe^III/II) and first reduction (E_p L^0/−).