Lanthanide complexes of polycarboxylate-bearing dipyrazolylpyridineligands with near-unity luminescence quantum yields: the effect of pyridine substitution

Abstract

The title complexes displayed a marked dependence of their luminescence properties upon pyridine substitution. The ligand with the 4-carbamoyl-substituted pyridine showed a long-lived luminescence of near-unity quantum yield for Tb³⁺ and quite reasonable values for Eu³⁺, Sm³⁺ and Dy³⁺, thus making it an excellent candidate for a luminescent probe to be attached to biomolecules by a peptide-like linkage.