The role of aspartyl-rich pentapeptides in comparative complexation of actinide(IV) and iron(III). Part 1 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue New Journal of Chemistry Année : 2009

The role of aspartyl-rich pentapeptides in comparative complexation of actinide(IV) and iron(III). Part 1

Résumé

Although there is a tremendous volume of data available on the interaction of actinides with living organisms as plants, nearly all the studies are limited to macroscopic or physiological measurements with no specific information at the molecular level. Peptides allow the study of complex coordination chemistry, as that involving actinide(IV) and proteins, without the intricacy of tertiary structure properties. For that purpose, a linear pentapeptide, acetyl-diaspartyl-prolyl-diaspartyl-amide (Ac-Asp-Asp-Pro-Asp-Asp-NH2, denoted PP1 in this report), was synthesized and investigated as a potential chelating ligand of thorium(IV), neptunium(IV) and/or plutonium(IV) cations. Comparison with the biological relevant iron(III) cation is also provided. Noteworthy, PP1 was able to prevent Np(IV) from hydrolysis into an insoluble precipitate. Spectrophotometry, C-13 NMR and EXAFS at the iron K edge and actinide L-3 edges were used to probe the cation coordination sphere and better describe the cation-peptide interaction. The complexes were found to be polynuclear with oxo or hydroxo bridged cations, Fe(III) forming a binuclear complex, Th(IV), Np(IV) or Pu(IV) forming a polynuclear complex with higher nuclearities.

Dates et versions

hal-00583012 , version 1 (04-04-2011)

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Citer

Aurélie Jeanson, Claude Berthon, S. Coantic, Christophe den Auwer, Nicolas Floquet, et al.. The role of aspartyl-rich pentapeptides in comparative complexation of actinide(IV) and iron(III). Part 1. New Journal of Chemistry, 2009, 33 (5), pp.976-985. ⟨10.1039/B813523A⟩. ⟨hal-00583012⟩
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