posted on 2018-09-26, 00:00authored byCaitlin
E. Bien, Kai K. Chen, Szu-Chia Chien, Benjamin R. Reiner, Li-Chiang Lin, Casey R. Wade, W. S. Winston Ho
A Zn benzotriazolate
metal–organic framework (MOF), [Zn(ZnO2CCH3)4(bibta)3] (1, bibta2– = 5,5′-bibenzotriazolate), has
been subjected to a mild CH3CO2–/HCO3– ligand exchange procedure followed
by thermal activation to generate nucleophilic Zn–OH groups
that resemble the active site of α-carbonic anhydrase. The postsynthetically
modified MOF, [Zn(ZnOH)4(bibta)3] (2*), exhibits excellent performance for trace CO2 capture
and can be regenerated at mild temperatures. IR spectroscopic data
and density functional theory (DFT) calculations reveal that intercluster
hydrogen bonding interactions augment a Zn–OH/Zn–O2COH fixation mechanism.