. 2019 Mar 12;5(4):580–588. doi: 10.1021/acscentsci.9b00095

Table 1. Interaction of CO₂, CO, and H⁺ for an Isostructural Series of Cobalt Pincer Complexes (Data from Ref (89)).

graphic file with name oc-2019-00095z_0006.jpg

L	P^CN^CP	P^NN^NP	P^ON^OP
E_1/2, LCo(II/I)^a	–1.03 V	–0.88 V	–0.61 V
k[CO₂] (s^–1), [LCo]^b	10^2–3	10^2–3	no reaction
[LCo(CO)]⁺, ν (cm^–1)	1911	1923	1936
pK_a,^c [LCo]	28		32

vs Fe(C₅H₅)₂^+/0 in CH₃CN.

Reactivity with CO₂ occurs upon reduction of the Co(I) complex, which is electrochemically irreversible. E_1/2 for the reversible Co(II/I) couple is provided to illustrate the electronic trend.

Calculated for corresponding protonated complex.

Table 1. Interaction of CO2, CO, and H+ for an Isostructural Series of Cobalt Pincer Complexes (Data from Ref (89)).

Table 1. Interaction of CO₂, CO, and H⁺ for an Isostructural Series of Cobalt Pincer Complexes (Data from Ref (89)).