Abstract
Abstract The stability constants for the formation of the lanthanide chelates LnH 2 DTPP° and LnH 3 DTPP + (DTPP = diethylenetriamine- N , N ′, N ′″-penta-β-propionate) have been measured in solutions of 0.50 M (NaClO 4 ) ionic strength by pH measurement. The similar stabilities of the two complexes indicate that both species involve similar binding sites of the ligand. The similarity in their entropy and enthalpy values also support such a model. Fluorescence data indicate that the primary coordination sphere of the Eu III ion in both complexes contains 5.5±0.5 water molecules compared to the value of 8.8±0.5 for the free Eu III (aq) ion. This is consistent with binding of the lanthanide ion via three donor sites of DTPP.
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