Dissociation-enhanced rare-earth

The fluorescence properties of several europium and samarium ) -diketonates have been measured and assignments of the transitions made. Rare-earth element hexafluoroacetylacetonates with amino-acids have also been reported to fluoresce. The luminescence of the heptafluoroheptane-2,4-dione complexes of Sm, Eu, and Tb has been measured in dilute ethanol at pH8 and 610nm mixed-ligand complexes with 1,10-phenanthroline exhibited an enhanced luminescence. Photolysis of the Tb chelate of 2,2,6,6-tetramethylheptane-3,5-dione has been examined at 311 nm in various alcohols, and loss of one -diketone ligand found to be the primary photochemical step. A linear correlation was demonstrated between the quantum yield of dissociation of the complex and the formation constant of the complex-alcohol adduct. 

ScHEPEES GWH (1955) The biological action of rare earths. II. Arch Ind Health 12 306-316. ScHOKET B, Doty WA, Vincze 1, Steickiand PT, Feeei GV, Assennato G and Poirier MC (1993) Increased sensitivity for determination of polycyclic aromatic hydrocarbon-DNA adducts in human DNA samples by dissociated-enhanced lanthanide fluoroimmunoassay (DELFIA). Cancer Epidemiol Biomarkers Prev 2 349-353. 

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