Aggregation of complexes formed in the extraction of selected metal cations by P,P'-di(2-ethylhexyl) methanediphosphonic acid

R. Chiarizia, V. Urban, P. Thiyagarajan, A. W. Herlinger

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The aggregation of several metal complexes formed during solvent extraction with P,P'-di(2-ethylhexyl) methanediphosphonic acid, H2DEH[MDP], in deuterated toluene, has been investigated by small angle neutron scattering (SANS). The SANS results show that the Ca(II)-, Al(III)-, La(III)- and Nd(III)-H2DEH[MDP] compounds exhibit little or no tendency to aggregate. Uranyl complexes of H2DEH[MDP] at high metal loading form small aggregates with an aggregation number of approximately 14. This behavior is in sharp contrast with the Th(IV)-H2DEH[MDP] system which forms large aggregates in the organic phase under high metal loading conditions. The aggregation behavior of the various metal-H2DEH[MDP] compounds is discussed in light of the information obtained from earlier solvent extraction, vapor pressure osmometry, and infrared spectroscopy studies.

Original languageEnglish
Pages (from-to)113-132
Number of pages20
JournalSolvent Extraction and Ion Exchange
Volume17
Issue number1
DOIs
StatePublished - 1999
Externally publishedYes

Funding

This work was supported by the U.S.Department of Energy, Office of Basic Energy Science, Division of Chemical Science (for the part performed at the Chemistry Division of ANL) and Division of Material Science (for the part performed at IPNS), under contract W-31-109-ENG-38.

Fingerprint

Dive into the research topics of 'Aggregation of complexes formed in the extraction of selected metal cations by P,P'-di(2-ethylhexyl) methanediphosphonic acid'. Together they form a unique fingerprint.

Cite this