Investigation of the interaction between 1-hydroxyethane-1,1'-diphosphonic acid (HEDP) and uranium(VI)

Christophe Jacopin; Marcin Sawicki; Gabriel Plancque; Denis Doizi; Frédéric Taran; Eric Ansoborlo; Badia Amekraz; Christophe Moulin

doi:10.1021/ic0343509

Investigation of the interaction between 1-hydroxyethane-1,1'-diphosphonic acid (HEDP) and uranium(VI)

Inorg Chem. 2003 Aug 11;42(16):5015-22. doi: 10.1021/ic0343509.

Authors

Christophe Jacopin¹, Marcin Sawicki, Gabriel Plancque, Denis Doizi, Frédéric Taran, Eric Ansoborlo, Badia Amekraz, Christophe Moulin

Affiliation

¹ CEA-Saclay, DEN/DPC/SECR/LSRM, 91191 Gif-sur-Yvette Cedex, France. jacopin@carnac.cea.fr

PMID: 12895127
DOI: 10.1021/ic0343509

Abstract

A detailed study, using a panel of spectroscopic analytical methods, of the complexation between 1-hydroxyethane-1,1'-diphosphonic acid (HEDP) and uranyl ion (UO(2)(2+)) is reported. Results suggest that the metal complex is present as only 1:1 (metal/ligand) species at low concentration (<10(-)(4) M). The conditional constants of this complex were determined at various pH using time-resolved laser-induced fluorescence (TRLIF) and electrospray ionization mass spectrometry (ESI-MS). Further investigations indicate the presence of a 1:2 (metal/ligand) complex at higher concentrations ( approximately 10(-)(2) M). Selectivity studies as well as structural aspects are presented.