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. 2022 Aug 3;8(31):eabo6849. doi: 10.1126/sciadv.abo6849

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Fig. 4. — (A) Depiction of the network of reversible carbamate N─CO₂ reaction sites. (B) ¹⁵N CP-MAS NMR spectra of MNNs^Cya ⊃ DETA with and without CO₂ adsorption. (C) ¹H-¹³C HETCOR NMR spectrum, with the assignment of observed correlations, for MNNs^Cya ⊃ DETA loaded with CO₂ at 1 bar. The contact time was 100 μs. (D) The two-level dynamic combinatorial system of CO₂ chemisorption species as confirmed by NMR. First-level species: ammonium carbamate and carbamic acid. Second-level species: ammonium carbamate/carbamic acid pairs.