Post-Synthetic Mannich Chemistry on Metal-Organic Frameworks: System-Specific Reactivity and Functionality-Triggered Dissolution.

ABSTRACT: The Mannich reaction of the zirconium MOF [Zr₆ O₄ (OH)₄ (bdc-NH₂ )₆ ] (UiO-66-NH₂ , bdc-NH₂ =2-amino-1,4-benzenedicarboxylate) with paraformaldehyde and pyrazole, imidazole or 2-mercaptoimidazole led to post-synthetic modification (PSM) through C-N bond formation. The reaction with imidazole (Him) goes to completion whereas those with pyrazole (Hpyz) and 2-mercaptoimidazole (HimSH) give up to 41 and 36 % conversion, respectively. The BET surface areas for the Mannich products are reduced from that of UiO-66-NH₂ , but the compounds show enhanced selectivity for adsorption of CO₂ over N₂ at 273 K. The thiol-containing MOFs adsorb mercury(II) ions from aqueous solution, removing up to

SUBMITTER: Amer Hamzah H 

PROVIDER: S-EPMC6099314 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature