The extracted parameters for the three isomers are presented in Table . The 𝑘 𝑐 values are >6.7, >6.0, 2.4 𝑠 -1 which would be >192, >171, and 68.6 𝑀 -1 𝑠 -1 (per moles of CO2) for 1,4-, 1,5-, and 1,8-BTMAPAQ isomers, respectively, indicating the rate constant for the occurrence of the nucleophilicity-swing mechanism. In contrast, the rate constant for bicarbonate/carbonate formation that is occurring in the pHswing mechanism is reported to be 12.1 * 10 3 𝑀 -1 𝑠 -1 at 25 o C , significantly higher than what we are reporting for the 𝐵𝑇𝑀𝐴𝑃𝐴𝑄(𝐶𝑂 2 ) 2 2-adduct formation mechanism. Having obtained the rate constants, we can predict the rates of both bicarbonate formation and the formation of the 𝐵𝑇𝑀𝐴𝑃𝐴𝑄(𝐶𝑂 2 ) 2