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The fluorescence quenching of tryptophan (Try) by the β-diketonate, Hfod (6,6,7,7,8,8,8-heptafluoro-2,2- dimethyloctanedione-3,5), and EuCl3 ⋅ 6H2O in liquid and frozen C2H5OH solutions was studied. It was found that, in contrast to Eu(III), the deactivation of Try* by the β-diketonate Eu(fod)3 in C2H5OH solutions was due to electron transfer to the Hfod organic ligand, rather than inner-sphere electron...
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