THE INFLUENCE OF SUBSTITUENTS ON THE LUMINESCENCE PROPERTIES OF THE EU(III) AND TB(III) CHELATES OF 4-(PHENYLETHYNYL)PYRIDINE DERIVATIVES

42 differently substituted 2,2',2 ine-2,6-diyl]bis(methylenenitrilo)}t etrakis(acetic acids) (1-42) were synthesized with the purpose of stud ying the influence of substituents on the luminescence properties of t he Eu(III) and Tb(III) chelates. With the Eu(III) ion, all derivatives (amides, ketones, esters, acids, ethers, halides and nitriles), with the exception of amines, gave a strong emission with suitable excitati on wavelengths while, with the Tb(III) ion, only meta-substituted carb onyl derivatives had moderate luminescence properties.