Interaction of thorium(IV) with nitrate in aqueous solution: medium effect or weak complexation?

Microcalorimetric titrations were performed to study the Th(IV)/nitrate interaction in aqueous solution. The results show the formation of a weak mononuclear complex of Th(IV) with nitrate and allow the determination of the complexation thermodynamic parameters at 298 K and ionic strength 1.0 mol dm...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2011-01, Vol.40 (36), p.9101-9105
Main Authors: Di Bernardo, Plinio, Zanonato, Pierluigi, Rao, Linfeng, Bismondo, Arturo, Endrizzi, Francesco
Format: Article
Language:English
Subjects:
Aqueous solutions
Complexation
Endothermic reactions
Entropy
Nitrates
Prints
Thermodynamics
Titration
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Summary:Microcalorimetric titrations were performed to study the Th(IV)/nitrate interaction in aqueous solution. The results show the formation of a weak mononuclear complex of Th(IV) with nitrate and allow the determination of the complexation thermodynamic parameters at 298 K and ionic strength 1.0 mol dm(-3). The reaction is endothermic and entropy driven. Data and comparison with similar actinide(IV) complexes allow to confirm the inner-sphere nature of the Th(NO(3))(3+) complex.
ISSN:1477-9226
1477-9234
DOI:10.1039/c1dt10325c