Abstract
We present a combined theoretical and experimental study of the Cm(III)-EDTA system in alkaline aqueous solutions. Time-resolved laser-fluorescence spectroscopy and vibronic side-band spectroscopy measurements are performed with , and . The evaluation of the TRLFS spectra and corresponding fluorescence lifetimes hints towards the predominance of Cm(EDTA) at pH = 7, with the subsequent formation of the hydrolysis species Cm(OH)(EDTA) with increasing pH. This speciation scheme is further supported by the excellent agreement obtained between experimental and calculated vibronic side bands. The relative stabilities of the complexes Cm(OH)(EDTA) with n = 0−2 and p = 1−2 are discussed on the basis of the equilibrium constants calculated from quantum chemical calculations.
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