Actinyl cation–cation interactions in the gas phase: an accurate thermochemical study
Journal Article
·
· Physical Chemistry Chemical Physics. PCCP
- Washington State Univ., Pullman, WA (United States); Washington State University
- Indiana State Univ., Terre Haute, IN (United States)
- Washington State Univ., Pullman, WA (United States)
Gas phase actinyl cation–cation interactions (CCIs) were studied by an accurate composite coupled cluster thermochemical approach for the first time. A number of CCI dimers were constructed from the monomers UO22+, UO2+, NpO22+, NpO2+, PuO2+, and AmO2+. All CCI dimers studied were calculated to be thermodynamically unstable, with dissociation energies ranging from -60 to -90 kcal mol-1, but in many cases kinetic stability was indicated by calculated local minima with well depths as large as ~15 kcal mol-1. Most of the dimers studied involved a T-shaped geometry, although one side-on dimer, (UO2+)2, was included since it was amenable to coupled cluster methods. In the T-shaped isomers the most stable dimers were calculated to arise when the oxo-group of an An(V) actinyl cation was oriented towards the metal center of an An(VI) actinyl cation. For both mixed-valent An(VI)/An(V) and mono-valent An(V) dimers, the stability as estimated from the depth of the calculated local minimum decreased in the donor series U(V) > Np(V) > Pu(V) > Am(V). These trends correlate well with experimental trends in condensed phase CCIs. A rationale for the bonding in CCIs was investigated by carrying out charge transfer analyses using the natural bond orbital (NBO) method. Augmenting the usual Lewis acid-base explanation, CCIs are the direct result of a competition between charge transfer stabilization, which can be as much as 0.11e or 30.7 kcal mol-1 at equilibrium, and Coulombic repulsive destabilization.
- Research Organization:
- Washington State Univ., Pullman, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0008501
- OSTI ID:
- 1611063
- Alternate ID(s):
- OSTI ID: 1503922
- Journal Information:
- Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 15 Vol. 21; ISSN 1463-9076
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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