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The 80 K Mössbauer spectra of the in situ formed iron species upon reaction of 57FeCl2(SciOPP) (57Fe–1-Cl2) with 20 equiv tBuPh-borate/6.7 equiv MgBr2 freeze-trapped after reaction at (A) 25 °C for 6 min and (B) 0 °C for 2 h. The individual Mössbauer components are identified as 4a (red), 4b (blue), 5-X (green), and 1-X2 (beige).
