Enhanced luminescence for detection of small molecules based on doped lanthanide compounds with dinuclear double-stranded helicate structure
A novel family of lanthanide materials were explored, dinuclear double-stranded helicate structure Ln2L2(DBM)4(OAc)2 [Ln = Sm (1), Eu (2) Gd (3) and Yb (4)] constructed from β-diketonate (DBM = dibenzoylmethanide and) and an auxiliary ligand Schiff base (H2L = N, N’-bis(salicylidene)butane-1,6-diamine). The structures of the isostructural complexes 1-4 were determined by single-crystal and powder X-ray crystallography. The optical properties of these compounds can be simply enhanced by doping method, allowing for the doped materials with tunable visible and near-infrared emission. Subsequently, a multifunctional sensor was employed to detect CH3COOH, expressly in allusion to poisonous ions Al3+ and Cr2O72–. The notable quenching effect and luminescence color change will prove that doped material is a promising fluorescence probe for the identification and detection of a few of specific anions, cations and organic small molecules.