Experimental study demonstrates reversible structural transitions and gate-opening adsorption in a cobalt framework, indicating high selectivity for benzene over cyclohexane.
A new metal-organic framework, namely [Co(DMTDC)(3-dptz)]·2.5DMF·0.5H2O] (Co-MOF-α), was solvothermally synthesized using the mixed ligands of a thienothiophene-containing dicarboxylate ligand, 3,4-dimethylthieno[2,3-b]thiophene-2,5-dicarboxylic acid (H2DMTDC), and 3,6-di(pyridin-3-yl)-1,2,4,5-tetrazine (3-dptz). Co-MOF-α exhibits a double-pillared-layer structure with primitive cubic (pcu) topology and two-dimensional channels with effective pore dimensions of ca. 3.5 × 8.0 and 2.7 × 6.5 Å2. Upon thermal activation, Co-MOF-α undergoes a reversible solid-state structural transformation to a nonporous phase, Co-MOF-β. Gas adsorption studies reveal that Co-MOF-β displays sudden gate-opening adsorption behaviors (type F‑IV isotherms) for both N2 (at 77 K) and CO2 (at 195 K). Furthermore, Co-MOF-β shows selective adsorption of benzene over cyclohexane at 298 K.
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Li et al. (2026) studied this question.
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