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To qualify as competent sorbents for airborne contaminants such as iodine vapor, permanent porosity and chemical stability are key criteria for the selection of candidate metal-organic frameworks (MOFs). To ensure these characteristics, in the present study, an unsymmetrical bifunctional ligand incorporating both carboxylic acid and hydroxamic acid groups was employed for MOF Zn(CBHA)(DMF) SUM-13; CPHA = 4-carboxyphenylhydroxamate, DMF = N,N-dimethylformamide design and synthesis. Though coupled with Zn2+, which does not typically yield kinetically robust MOFs with hard acids, the SUM-13 featuring differentiated coordination modes of chelating, bridging and monodentate bonding exhibited exceptional chemical stability and permanent porosity, with a Brunauer–Emmett–Teller (BET) surface area of 296.9 m2/g and a total pore volume of 0.1196 cm3/g. Additionally, with porosity and open metal sites at the five-coordinate Zn2+ centers, SUM-13 was demonstrated to be an eligible iodine adsorbent, reaching a maximum uptake of 796 mg/g. These findings underscore the validity and potential of the design strategy in constructing stable metal–organic frameworks.
Song et al. (Thu,) studied this question.