A multifunctional fluorescent Cd-MOF probe: its synthesis, structure, and sensing properties

Abstract

A 3D structure of Cd-MOF with a 1D cavity based on 4-(2,2′:6′,2′′'-terpyridine)-3,5-benzenedicarboxylic acid ligand (H₂dbta) was obtained, namely, [Cd(dbta)]_n (1). The size of the pore in complex 1 is 10.59 × 11.75 Ų. In addition, the surface area and pore size distribution of complex 1 were measured. The properties of the multifunctional fluorescent probe complex 1 were characterized in detail. Complex 1 can effectively identify CrO₄²⁻ and Cr₂O₇²⁻ ions, and also has high accuracy and recoverability for the identification of Fe³⁺ ions and TNP molecules. The limits of detection for the tested substances were further determined. The sensing mechanisms of the fluorescent probe complex 1 for the above analytes were comprehensively explored.