Abstract
Hafnium complexes with glycolic, lactic, malic, tartaric and citric acids were studied in perchlorate medium (1.0-3.0 mol l-1 HClO4) by using the competitive extraction method. In the hydroxy acid concentration region 0.01-1.0 or 2.0 mol l-1, complexes with the hafnium-to-ligand ratios 1 : 1 and 1 : 2 (in the case of lactic and malic acids also 1 : 3) were identified and their stability constants determined. One proton is split off during the formation in acidic medium, a five-membered chelate ring being formed with the Hf(IV) cation bonded to the non-dissociated hydroxy group of the ligand.
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