| Autor: |
Raposo-Hernández G; Department of Physical Chemistry, University of Seville, 41012 Seville, Spain., Martínez JM; Department of Physical Chemistry, University of Seville, 41012 Seville, Spain., Pappalardo RR; Department of Physical Chemistry, University of Seville, 41012 Seville, Spain., Den Auwer C; Université Côte d' Azur, CNRS, ICN, 06108 Nice, France., Sánchez Marcos E; Department of Physical Chemistry, University of Seville, 41012 Seville, Spain. |
| Jazyk: |
angličtina |
| Zdroj: |
Inorganic chemistry [Inorg Chem] 2022 Jun 13; Vol. 61 (23), pp. 8703-8714. Date of Electronic Publication: 2022 May 26. |
| DOI: |
10.1021/acs.inorgchem.2c00461 |
| Abstrakt: |
The physicochemical properties of the monovalent actinyl cations, PuO 2 + and NpO 2 + , in water have been studied by means of classical molecular dynamic simulations. A specific set of cation-water intermolecular potentials based on ab initio potential energy surfaces has been built on the basis of the hydrated ion concept. The TIP4P water model was adopted. Given the paramagnetic character of these actinyls, the cation-water interaction energies were computed from highly correlated wave functions using the NEVPT2 method. It is shown that the multideterminantal character of the wave function has a relevant effect on the main distances of the hydrated molecular cations. Several structural, dynamical, and energetic properties of the aqueous solutions have been obtained and analyzed. Structural RDF analysis gives An-O yl distances of 1.82 and 1.84 Å and An-O(water) distances of 2.51 and 2.53 Å for PuO 2 + and NpO 2 + in water, respectively. Experimental EXAFS spectra from dilute aqueous solutions of PuO 2 + and NpO 2 + are revisited and analyzed, assuming tetra- and pentahydration of the actinyl cations. Simulated EXAFS spectra have been computed from the snapshots of the MD simulations. Good agreement with the experimental information available is found. The global analysis leads us to conclude that both PuO 2 + and NpO 2 + cations in water are stable pentahydrated aqua ions. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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