A bifunctional fluorescence sensing coordination polymer for Fe3+ and MnO4−

Abstract

The reaction between rigid ligand 1,1′:4′,1″-terphenyl-2′,4,4″,5′-tetracarboxylic acid (H4L), 2-pyrimidineamidoxime (Hpmad) and Cd2+ ions led to a two-dimensional coordination polymer [Cd2L(Hpmad)2(H2O)2]·3H2O (CdL). CdL exhibits blue-violet light emission with maximum emission wavelength of 392 nm. Luminescence sensing experiments show that CdL has the ability to detect Fe3+ and MnO4− in aqueous solution. The Ksv value is 12830 M−1 in the detection concentration range of 0–50 μM for Fe3+, and the Ksv value is 17340 M−1 in the detection concentration range of 0–20 μM for MnO4−. The fluorescence sensing mechanisms were also discussed.