Fig. 9. Freeze-trapped 80 K Mössbauer spectrum of the in situ formed iron species upon reaction of 4^Mes with CO at 24 hours of reaction. The individual Mössbauer components are identified as 4^Mes (orange. δ = −0.10 mm s⁻¹, |ΔE_Q| = 1.56 mm s⁻¹) Fe(CO)₅ (pink. δ = −0.08 mm s⁻¹, |ΔE_Q| = 2.54 mm s⁻¹), 10 (light blue. δ = 0.30 mm s⁻¹, |ΔE_Q| = 1.10 mm s⁻¹), A (light green. δ = 1.10 mm s⁻¹, |ΔE_Q| = 1.79 mm s⁻¹) and B (red. δ = 1.21 mm s⁻¹, |ΔE_Q| = 2.33 mm s⁻¹). Raw data are shown as black dots, total fit as a black line, and individual components as colored lines. Further reaction time points at 2, 3, 4 and 5 days are given in the ESI (Fig. S61).‡.