Huang et al. (2025): Phase Change-Mediated Capture of Carbon Dioxide from Air with a Molecular Triamine Network Solid

Adrian J. Huang, Ankur K. Gupta, Henry Z. H. Jiang, Hao Zhuang, Malia B. Wenny Ryan A. Klein, Hyunchul Kwon, Katie R. Meihaus, Hiroyasu Furukawa, Craig M. Brown, Jeffrey A. Reimer, Wibe A. de Jong, Jeffrey R. Long IN: Journal of the American Chemical Society, https://doi.org/10.1021/jacs.4c18643

The recent discovery that diamine-appended metal–organic frameworks can exhibit cooperative CO₂ uptake via the formation of ammonium carbamate chains begs the question of whether simple organic polyamine molecules could be designed to achieve a similar switch-like behavior with even higher separation capacities. Here, the authors present a solid molecular triamine, 1,3,5-tris(aminomethyl)benzene (TriH), that rapidly captures large quantities of CO₂ upon exposure to humid air to form the porous, crystalline, ammonium carbamate network solid TriH(CO₂)_1.5·xH₂O (TriHCO₂). The phase transition behavior of TriH converting to TriHCO₂ was studied through powder and single-crystal X-ray diffraction analysis, and additional spectroscopic techniques further verified the formation of ammonium carbamate species upon exposing TriH to humid air.

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