Water-Stable Lanthanide-Organic Macrocycles from 1,2,4-Triazole-based Chelate for Enantiomeric Excess Detection and Pesticide Sensing

Water-stable anionic Ln2L2-type (Ln = LaIII and EuIII) lanthanide–organic macrocycles have been constructed by deprotonation self-assembly of a bis-tridentate ligand consisting of two 2,6-bis-(1,2,4-triazole)-pyridine chelation arms bridged by a dibenzofuran chromophore, of which the luminescent Eu2L2 macrocycle can be used for enantiomeric excess (ee) detection toward pybox-type chiral ligands and selective colorimetric sensing of omethoate (OMA) in water.