Solvent-assisted linker exchange as a tool for the design of mixed-linker MIL-140D structured MOFs for highly selective detection of gaseous H 2 S.

A MIL-140D- sdc framework has been used as a highly stable backbone for the introduction of 4,4'-azobenzene dicarboxylic acid (H 2 abdc ) via solvent-assisted ligand exchange (SALE). The implemented azo groups can serve as coordination sites for copper ions. These can exchange ligands with different gases, but show a high selectivity against H 2 S, which makes this material promising for potential sensor applications.