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In this work,magnesium tetraphenylporphyrin(MgTPP) was used as a new supramolecular amine-fixing agent.Once introduced,CO_2 easily competes with MgTPP for amines,leading to the release of MgTPP. The processes can be explained by the fact that the association constant(K_(assoc)) values of MgTPP with amines were in the range of 0.6(ethanolamine) to 3.9(ethylenediamine),which are lower than the K_(assoc) values of CO_2 with these amines.MgTPP interacted with aniline,ethanolamine,pyrrolidine,or ethylenediamine to form 1:1 adducts.Ethylenediamine presents a stronger K_(assoc) value for MgTPP,so it was considered an optimal agent for CO_2 capture.
In this work, magnesium tetraphenylporphyrin (MgTPP) was used as a new supramolecular amine-fixing agent. Once introduced, CO 2 easily competes with MgTPP for amines, leading to the release of MgTPP. The processes can be explained by the fact that the association constant (K_ (assoc)) values of MgTPP with amines were in the range of 0.6 (ethanolamine) to 3.9 (ethylenediamine), which are lower than the K_ (assoc) values of CO_2 with these amines.MgTPP interacted with aniline, ethanolamine, pyrrolidine , or ethylenediamine to form 1: 1 adducts. Ethylenediamine presents a stronger K_ (assoc) value for MgTPP, so it was considered an optimal agent for CO_2 capture.