Abstract
Sensitized fluorescence emission of f-element ions was studied for the humate and fulvate complexes of Cm(III) by time-resolved laser fluorescence spectroscopy. Complexation with chelating aromatic carboxylic acids, which may be regarded as complexing functional groups of humic substances, e.g. phthalic and salicylic acids, was investigated in parallel for comparison. Excitation and emission spectra, together with lifetimes of excited states, were investigated for the Cm(III) complex species as well as for the individual pure ligans. The fluorescence enhancement was found to be weak in the Cm(III)-phthalate and strong in the Cm(III)-salicylate. The latter is comparable with the Cm(III)-fulvate. The efficiency of energy transfer was calculated from the excitation at 308 nm. The results are discussed in terms of energy overlapping between triplet states of ligands and excited levels of Cm(III).
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