Multifunctional Lanthanide Metal-Organic Frameworks Based on -NH Modified Ligand: Fluorescent Ratio Probe, CrO Ions Adsorption, and Photocatalytic Property.

In response to the growing concern for environmental pollution, two lanthanide compounds {[Ln(L)(HO)]·4HO} (where Ln = Tb and Gd, HL = 1-amino-2,4,6-benzene tricarboxylic acid) were synthesized using a -NH modified ligand and systematically characterized. Both compounds exhibit remarkable fluorescence response, adsorption of CrO ions, and photocatalytic degradation properties, as well as exceptional acid-base and thermal stability. Remarkably, the pH-dependent exhibits exceptional performance as a fluorescent probe for detecting Fe and CrO/CrO ions in aqueous solutions, while also serving as a ratiometric fluorescent probe for the detection of Cr, offering rapid response, high sensitivity, selectivity, and recoverability advantages in application.