Table 1.

Thermodynamic and kinetic parameters for CO₂ capture and heat release

Entry	Reaction/parameter	ΔH (kJ/mol)c	Kc	Solubility (mol/L)c	Reference
1	FuBIG dissolution	ΔH1 = 49.19d	K1 = 4.03 × 10−1i	S1 = 0.4029	Figure S10
2	FuBIG protonationa	ΔH2 = 46.08e	K2 = 1.91 × 10−12j	–	Figure S12
3	CO2 dissolution	ΔH3 = −19.4	K3 = 3.4 × 10−2	–	Carroll et al., 1991
4	HCO3- formation	ΔH4 = −50	K4 = 3.02×107	–	Wang et al., 2010
5	CO32− formation	ΔH5 = −40.4	K5 = 4.66×103	–	McCann et al., 2011
6	FuBIGH2(CO3) (H2O)4 crystallization	ΔH6 = −101.57f	K6 = 1.63×107k	S6 = 0.009344	Figure S11
7	overall CO2 absorption	ΔH7 = −116.1g	K7 = 5.97 × 104l	–	Table 1
8	CO2 releaseb	ΔH8 = 209.31h	–	–	Figure S15
9	[Rs]	–	–	43.12m	Figures S10 and S11

^aThis reaction included a double deprotonation processes of water.

^bCO₂ heat release was measured at a persistent heating rate (10°C/min).

^cThe parameters were determined at standard temperature (25°C) unless otherwise specified.

^dDetermined by van't Hoff analysis of solubility values of FuBIG measured in the 15–35°C range.

^eThe enthalpies for the protonation processes of FuBIG were calculated by van't Hoff analysis of pK_a values measured in the 15–35°C range, and included the enthalpies for a double deprotonation processes of water (55.8 kJ/mol).

^fDetermined by van't Hoff analysis of K_sp values measured in the 15–35°C range.

^gΔH₇ = ΔH₁ + ΔH₂ + ΔH₃ + ΔH₄ + ΔH₅ + ΔH₆.

^hDetermined from the endotherm observed in the DSC.

ⁱK₁ = K_sp(FuBIG).

^jK₂ = (K_w)²/(K_a1 × K_a2).

^kK₆ = 1/K_sp(FuBIGH₂(CO₃) (H₂O)₄).

^lK₇ = K₁×K₂×K₃×K₄×K₅×K₆.

^m[R_s] = S₁/S₆.