New Stable Cu–K Metal–Organic Framework Constructed by a Bifunctional Ligand: Structure, Application in Dye Adsorption, and Catalytic CO<sub>2</sub> Cycloaddition Reaction
Yuting Yang, Chang‐Zheng Tu, Junyou Shi, Xiao-Li Yang, Jian‐Jun Liu, Feixiang Cheng
Abstract
A new three-dimensional heterometallic metal–organic framework (MOF), namely, {(Me2NH2)2[CuK4(BPDSDC)2]}n (1), has been synthesized under solvothermal conditions. Compound 1 was constructed by biphenyl-3,3′-disulfonyl-4,4′-dicarboxylic acid dipotassium salt (H2K2–BPDSDC), which has two sulfonyl and two carboxyl functional groups. Compound 1 is a 3D framework with ribbon-shaped Cu–K chains, regular square channels, unsaturated Lewis acidic Cu(II) ions, and exposed oxygen atoms. PXRD and TGA measurements confirmed that 1 exhibits good chemical and thermal stability. The dye adsorption behavior of compound 1 was explored in detail, which showed that 1 can efficiently and selectively adsorb cationic dye methylene blue (MB). Compound 1 also showed catalytic activity for the cycloaddition reaction of carbon dioxide (CO2) with epoxides. Furthermore, catalyst 1 was easy to recover and reuse, and the catalytic activity did not decrease significantly after 5 cycles. A plausible mechanism for the cycloaddition reaction was also proposed.