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Title: SANS study of aggregation of the complexes formed by selected metal cations and P,P{prime}-di(2-ethylhexyl)ethane- and butane-diphosphonic acids

Abstract

The aggregation of several metal complexes formed during solvent extraction with P,P{prime}-di(2-ethylhexyl) ethanediphosphonic acid, H{sub 2}DEH[EDO], and by P,P{prime}-di(2-ethylhexyl) butanediphosphonic acid, H{sub 2}DEH[BuDP], in deuterated toluene, has been investigated by small angle neutron scattering (SANS). With H{sub 2}DEH[EDP], the extraction of Ca(II), La(III) and U(VI) does not disrupt the cyclic hexameric structure of the ligand in solution. Fe(III) and Th(IV) complexes of H{sub 2}DEH[EDP], on the other hand, exhibit a very modest tendency to aggregate but only at very high metal loading in the organic phase. With H{sub 2}DEH[BuDP], the extraction of Ca(II), La(III), U(VI) and Th(IV) is not accompanied by significant aggregation of the metal complexes. The Fe(III)-H{sub 2}DEH[BuDP] complexes, however, form long cylindrical aggregates similar to those previously observed with P,P{prime}-di(2-ethylhexyl) methanediphosphonic acid, H{sub 2}DEH[mdp]. The aggregation behavior of the various metal-extractant species is discussed in light of the information obtained from earlier solvent extraction, vapor pressure osmometry, and infrared spectroscopy studies.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20000554
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
Solvent Extraction and Ion Exchange
Additional Journal Information:
Journal Volume: 17; Journal Issue: 5; Other Information: PBD: Sep 1999; Journal ID: ISSN 0736-6299
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; PHOSPHONIC ACIDS; SOLVENT EXTRACTION; CALCIUM; LANTHANUM; URANIUM; IRON; THORIUM; AGGLOMERATION; COMPLEXES

Citation Formats

Chiarizia, R., Urban, V., Thiyagarajan, P., and Herlinger, A.W. SANS study of aggregation of the complexes formed by selected metal cations and P,P{prime}-di(2-ethylhexyl)ethane- and butane-diphosphonic acids. United States: N. p., 1999. Web. doi:10.1080/07366299908934642.
Chiarizia, R., Urban, V., Thiyagarajan, P., & Herlinger, A.W. SANS study of aggregation of the complexes formed by selected metal cations and P,P{prime}-di(2-ethylhexyl)ethane- and butane-diphosphonic acids. United States. doi:10.1080/07366299908934642.
Chiarizia, R., Urban, V., Thiyagarajan, P., and Herlinger, A.W. Wed . "SANS study of aggregation of the complexes formed by selected metal cations and P,P{prime}-di(2-ethylhexyl)ethane- and butane-diphosphonic acids". United States. doi:10.1080/07366299908934642.
@article{osti_20000554,
title = {SANS study of aggregation of the complexes formed by selected metal cations and P,P{prime}-di(2-ethylhexyl)ethane- and butane-diphosphonic acids},
author = {Chiarizia, R. and Urban, V. and Thiyagarajan, P. and Herlinger, A.W.},
abstractNote = {The aggregation of several metal complexes formed during solvent extraction with P,P{prime}-di(2-ethylhexyl) ethanediphosphonic acid, H{sub 2}DEH[EDO], and by P,P{prime}-di(2-ethylhexyl) butanediphosphonic acid, H{sub 2}DEH[BuDP], in deuterated toluene, has been investigated by small angle neutron scattering (SANS). With H{sub 2}DEH[EDP], the extraction of Ca(II), La(III) and U(VI) does not disrupt the cyclic hexameric structure of the ligand in solution. Fe(III) and Th(IV) complexes of H{sub 2}DEH[EDP], on the other hand, exhibit a very modest tendency to aggregate but only at very high metal loading in the organic phase. With H{sub 2}DEH[BuDP], the extraction of Ca(II), La(III), U(VI) and Th(IV) is not accompanied by significant aggregation of the metal complexes. The Fe(III)-H{sub 2}DEH[BuDP] complexes, however, form long cylindrical aggregates similar to those previously observed with P,P{prime}-di(2-ethylhexyl) methanediphosphonic acid, H{sub 2}DEH[mdp]. The aggregation behavior of the various metal-extractant species is discussed in light of the information obtained from earlier solvent extraction, vapor pressure osmometry, and infrared spectroscopy studies.},
doi = {10.1080/07366299908934642},
journal = {Solvent Extraction and Ion Exchange},
issn = {0736-6299},
number = 5,
volume = 17,
place = {United States},
year = {1999},
month = {9}
}