. 2017 Feb 14;3(3):217–223. doi: 10.1021/acscentsci.7b00014

Table 1. N₂-to-NH₃ Conversion with P₃^EM Complexes (M = Fe, Co)^a.

	catalyst	Cp*₂Co (equiv)	acid (equiv)	equiv of NH₃/Fe	% yield of NH₃/e^–
1	P₃^BFe⁺	54	108^c	12.8 ± 0.5	72 ± 3
2	P₃^BFe⁺	162	322^c	34 ± 1	63 ± 2
3	P₃^BFe⁺	322	638^c	26.7 ± 0.9	25 ± 1
4^b	P₃^BFe⁺	[162] × 2	[322] × 2^c	56 ± 9	52 ± 9
5^b	P₃^BFe⁺	[162] × 3	[322] × 3^c	84 ± 8	52 ± 5
6	P₃^BFe⁺	54	108^d	8 ± 1	42 ± 6
7	P₃^BFe⁺	54	108^e	7 ± 1	38 ± 7
8	P₃^BFe⁺	162	322^e	16 ± 3	29 ± 4
9	P₃^SiFeN₂	54	108^c	1.2 ± 0.1	6 ± 1
10	P₃^BCoN₂^–	54	108^c	1.1 ± 0.4	6 ± 2
11	P₃^SiCoN₂	54	108^c	0 ± 0	0 ± 0

The catalyst, acid, Cp*₂Co, and Et₂O were sealed in a vessel at −196 °C under an N₂ atmosphere followed by warming to −78 °C and stirring. Yields are reported as an average of at least 2 runs; for individual experiments see the Supporting Information.

For these experiments the reaction was allowed to proceed for 3 h at −78 °C before cooling to −196 °C and furnishing with additional substrate and solvent.

[Ph₂NH₂][OTf].

[Ph₂NH₂][BAr^F₄].

[PhNH₃][OTf].

Table 1. N2-to-NH3 Conversion with P3EM Complexes (M = Fe, Co)a.

Table 1. N₂-to-NH₃ Conversion with P₃^EM Complexes (M = Fe, Co)^a.