Two MOFs as dual-responsive photoluminescence sensors for metal and inorganic ion detection

Abstract

Two metal–organic frameworks (MOFs), [Zn(BIPA)(tfbdc)]_n (1) and {[Cd(BIPA)(tfbdc)(H₂O)]·DMF}_n (2), were hydrothermally synthesized using the self-assembly of the “V-shape” BIPA ligand (bis(4-(1H-imidazol-1-yl)phenyl)amine) and the H₂tfbdc ligand (2,3,5,6-tetrafluorobenzene-1,4-dicarboxylic acid) with Zn/Cd metal salts. 1 is a 2D hcb framework and 2 is a 2D sql network. Their applications in detecting metal and inorganic ions were also explored. The results indicate that 1 exhibits dual-responsive photoluminescence sensing for Fe³⁺ and Cr₂O₇²⁻ ions while 2 can detect Hg²⁺ and Cr₂O₇²⁻ ions.