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. Author manuscript; available in PMC: 2017 Apr 27.
Published in final edited form as: J Am Chem Soc. 2016 Apr 15;138(16):5341–5350. doi: 10.1021/jacs.6b01706

Scheme 3.

Scheme 3

Possible catalytic scenarios for N2-to-NH3 conversion by 1. [Fe] = P3BFe. Thoroughly characterized species and their respective ground spin states S are shown in blue, while as yet undetected species are shown in black. Blue arrows indicate known pathways that are likely kinetically competent (solid) at −78 °C. Dashed arrows are likely incompetent at −78 °C.