2013
DOI: 10.1021/ic400378t
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Thermodynamic Study of the Complexation of Protactinium(V) with Diethylenetriaminepentaacetic Acid

Abstract: The complex formation of protactinium(V) with DTPA was studied at different temperatures (25-50 °C) and ionic strengths (0.1-1 M) with the element at tracer scale. Irrespective of the temperature and ionic strength studied, only one neutral complex with (1:1) stoichiometry was identified from solvent extraction and capillary electrophoresis coupled to ICP-MS (CE-ICP-MS) experiments. Density Functional Theory (DFT) calculations revealed that two complexes can be considered: Pa(DTPA) and PaO(H2DTPA). The associa… Show more

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Cited by 16 publications
(12 citation statements)
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“…Although it is well understood that Np(V) in aqueous conditions forms the linear dioxo-neptunyl cation, NPO þ 2 [2,37], less is known about the molecular features of the Pa complex in solution. It was hypothesized, and recently demonstrated, that Pa forms a linear mono oxo-protactinyl moiety [31,37,38] [2].…”
Section: Isolation Of Protactiniummentioning
confidence: 99%
“…Although it is well understood that Np(V) in aqueous conditions forms the linear dioxo-neptunyl cation, NPO þ 2 [2,37], less is known about the molecular features of the Pa complex in solution. It was hypothesized, and recently demonstrated, that Pa forms a linear mono oxo-protactinyl moiety [31,37,38] [2].…”
Section: Isolation Of Protactiniummentioning
confidence: 99%
“…34 Oxalate and diethylenetriaminepentaacetate can also form complexes containing Pa−O bonds. 35,36 The use of HF as the complexing medium eliminated all Pa−O bonds, 22,34,37 38 Extended X-ray absorption fine structure spectra suggested the possibility of the hydrate PaF 7 (H 2 O) 2− in very dilute HF solutions. 39 Theoretical studies have also examined essential aspects of the chemistry of Pa. 40−42 The calculated structure of PaO 2 + is linear and its electronic structure is similar to those of higher linear actinides, where the 5f orbital contribution to bonding is important.…”
mentioning
confidence: 99%
“…In recent years, the coordination structures of protactinium have been reported [14,15,16,17,18,19]. The element Pa mainly shows two possible valence states of Pa(IV) and Pa(V) in hydrous solutions [20].…”
Section: Introductionmentioning
confidence: 99%