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The 80 K Mössbauer spectra of the in situ generated iron species upon reaction of 57FeCl2(SciOPP) (57Fe–1-Cl2) with 2 equiv PhMgBr in 1:1 THF/2-MeTHF at (A) 25 °C freeze-trapped after 30 s of reaction time and (B) 0 °C freeze-trapped after 5 min of reaction time. The individual Mössbauer components are identified as 4a (red), 4b (blue), and 3 (orange).
