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By employing the ligand 2-(isonicotinamido)terephthalic acid (H2L) containing the amide functional groups, a Cd-MOF, {[Cd2L2(H2O)2]·4H2O}n (1) has been constructed by solvothermal synthesis. The dinuclear clusters [Cd2(COO)2] in 1 are linked by the pyridinyl and carboxylate groups of ligands to form a three-dimensional (3D) skeleton, containing 1D channels with the free amide groups. The activated framework shows good stability in water and high selectivity for CO2 over CH4. The open Cd2+ site as Lewis acidic center makes the MOF achieve efficiently catalytic conversion for CO2 cycloaddition with epoxides. Furthermore, 1 also exhibits good chemical stability in water, allowing the detection for ronidazole (RDZ) and dimetridazole (DTZ) with the low detection limit and rapid response.

The self-assembly of Zn2+ ion and an azolyl-carboxyl bifunctional ligand, 4,6-bis(triazol-1-yl)isophthalic acid (H2btzip), give rise to one three-dimensional (3D) porous metal-organic framework (MOF), [Zn(btzip)(H2O)0.5]·H2O (1). The MOF shows a rare (4,8)-connected scu net containing 1D channels, based on 4-connecetd ligands and 8-connected [Zn(COO)2(H2O)] dimers. Owing to the decoration of uncoordinated N atoms in porous walls, 1 can selectively capture CO2 molecules over CH4 with high adsorption heat and considerable selectivity. The different adsorption sites for CO2 in 1 were deeply explored by simulations. In addition, 1 also displays strong solid-state luminescence that is from the intraligand charge transfer.