Y(III)-enhanced Dy(III) and Sm(III)-specific electrogenerated luminescence of heterodinuclear 1-Y(III)-Dy(III)-1 and 1-Y(III)-Sm(III)-1 chelates

1 is a heptadentate chelating agent which forms stable dimer-like dinuclear chelates. At a pulse-polarized oxide-covered aluminium cathode in the presence of peroxydisulfate, the homodinuclear 1-Y(III)-Y(III)-1 chelate generates a weak Y(III)-initiated ligand-centered 322 nm ECL, while the homodinuclear 1-Ln(III)'-Ln(III)'-1 and heterodinuclear 1-Y(III)-Ln(III)'-1 chelates (Ln(III)'=Dy(III), Sm(III)) initiate intense ligand-sensitized Dy(III)-specific and Sm(III)-specific 4F9/2→6Hj and 4F5/2→6Hj transitions, respectively, so that the ECL efficiency of the heterodinuclear chelate is around ten-fold as compared with that of the corresponding homodinuclear chelate. (orig.)