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New 2,2′‐Bipyridine Derivatives and Their Luminescence Properties with Europium(III) and Terbium(III) Ions
Author(s) -
Mukkala VeliMatti,
Kankare Jouko J.
Publication year - 1992
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19920750512
Subject(s) - chemistry , luminescence , terbium , europium , moiety , substituent , bipyridine , ion , chelation , lanthanide , photochemistry , inorganic chemistry , medicinal chemistry , crystallography , stereochemistry , organic chemistry , crystal structure , physics , optoelectronics
Twenty differently substituted 2,2′,2″,2‴ ‐[(2,2′‐bipyridine‐6,6′‐diyl)bis(methylenenitrilo)]tetrakis(acetc 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. NO 2 , COOH) had a reverse effect. However, no clear correlation between the relative luminescence yields and the substituent parameters was found.