A 2D cadmium metal–organic framework: Synthesis, structure and luminescence sensing for chromate, permanganate, cupric, silver and ferric

A multi‐responsive Cd metal–organic framework {[Cd (ttpe)(H2O)(ip)]•4H2O•DMAC}n (1•4H2O•DMAC) was synthesized using hydrothermal method (ttpe = 1,1,2,2‐tetra(4‐(1H‐1,2,4‐triazol‐1‐yl)phenyl)ethylene, ip = isophthalate, DMAC = N,N‐dimethylacetamide), and characterized. 1 exhibits a 2D (4,4) network. The luminescent sensing experimrnts showed that 1•4H2O•DMAC as a new MOF luminescent sensor can detect Cr2O72−, CrO42−, MnO4−, Cu2+, Ag+ and Fe3+ in aqueous solution with simultaneously high efficiency and high sensitivity. The quenching constants Ksv for Cr2O72−, CrO42−, MnO4−, Cu2+, Ag+ and Fe3+ are 4.231 × 104 M−1, 2.471 × 104 M−1, 6.459 × 103 M−1, 7.617 × 103 M−1, 1.563 × 104 M−1 and 3.574 × 104 M−1, respectively. The detection limits are 0.094 μM for Cr2O72−, 0.108 μM for CrO42−, 0.346 μM for MnO4−, 0.302 μM for Cu2+, 0.221 μM for Ag+, and 0.100 μM for Fe3+. 1•4H2O•DMAC exhibits high photocatalytic efficiency for degradation of methylene blue under visible light irradiation.