A (4,6)-c copper-organic framework constructed from triazole-inserted dicarboxylate linker with CO₂ selective adsorption

Angular ligands are a class of important linkers to design and construct new metal-organic frameworks (MOFs). Herein, solvothermal reaction of 4,4 '-(4H-1,2,4-triazole-3,5-diyl)dibenzoic acid (TZDB), a triazole-inserted dicarboxylate, acetate, and Cu(NO3)(2)3H(2)O afforded a copper(II)-organic framework of Cu-TZDB. Structural analysis shows that Cu-TZDB displays an unusual (4,6)-c topological network concomitant with the generation of metalloligand [Cu(TZDB)(H2O)(2)] in situ. Due to its bi-channel cavities replete with triazolate, coordinated water and methyl groups, Cu-TZDB exhibits CO2 selective adsorption over N-2 and CH4, which was not only predicted by ideal adsorption solution theory (IAST), but also verified by dynamic column breakthrough tests.