New 2,2'-Bipyridine Derivatives and Their Luminescence Properties with Europium(III) and Terbium(III) Ions

Article abstract of DOI:10.1002/hlca.19920750512

Twenty differently substituted 2,2',2",2"'-<(2,2'-bipyridine-6,6'-diyl)bis(methylenenitrilo)tetrakis(acetic acids) 75-94 were synthesized with the purpose of developing new markers to be used in bioaffinity assays based on the unique luminescence properties of Eu^III and Tb^III ions.The relative luminescence yields, excitation maxima, and emission decay constants were determined for the corresponding Eu^III and Tb^III chelates.The substituents at the bipyridine moiety had a significant effect on the luminescence properties: the best relative luminescence yields R were obtained for ligands with electron-donating substituents (e.g.Me, Ph), electron-withdrawing substituents (e.g.NO2, COOH) had a reverse effect.However, no clear correlation between the relative luminescence yields and the substituent parameters was found.