. 2020 Oct 1;5(40):26125–26133. doi: 10.1021/acsomega.0c03727

Table 1. Activation Energy Ea and Free Gibbs Energy Δ_rG* in kcal mol^–1 for the Reaction Involving CO₂ and Several Amines under Dry and Wet Conditions in the Gas State and in the Presence of CCl₄ and H₂O Solvents.

		CH₃NH₂	H₂N(CH₂)₂NH₂	CH₃NH₂/CH₃NH₂^a	CH₃NH₂/H₂O^a	CA^b + H₂O	H₂O/CH₃NH₂^a
Ea	gas	42.8	26.5	13.2	16.5	47.3	21.0
Δ_rG*	gas	44.8	32.6	25.9	27.7	55.4	18.5
	CCl₄	41.8	23.4	16.7	24.7	54.9	20.5
	H₂O	31.3	5.2	2.4	15.1	53.1	9.4

The first compound is the nucleophile (Lewis base), and the second compound is the assisting species (Bro̷nsted base).

CA designates carbamic acid formed by the addition of methylamine and CO₂.

Table 1. Activation Energy Ea and Free Gibbs Energy ΔrG* in kcal mol–1 for the Reaction Involving CO2 and Several Amines under Dry and Wet Conditions in the Gas State and in the Presence of CCl4 and H2O Solvents.