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Redox-Inactive Metal Cations Modulate the Reduction Potential of the Uranyl Ion in Macrocyclic Complexes

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.9b11903· OSTI ID:1600028
 [1];  [2];  [2];  [2]
  1. Univ. of Kansas, Lawrence, KS (United States); University of Kansas, Lawrence, KS, United States
  2. Univ. of Kansas, Lawrence, KS (United States)
Capture and activation of the water-soluble uranyl dication (UO22+) remains a challenging problem, as few rational approaches are available for modulating the reactivity of this species. Here, we report the divergent synthesis of heterobimetallic complexes in which UO22+ is held in close proximity to a range of redox-inactive metals by a tailored macrocyclic ligand. Crystallographic and spectroscopic studies confirm assembly of homologous UVI(μ-OAr)2Mn+ cores with a range of mono-, di-, and tri-valent Lewis acids (Mn+). Cyclic voltammetry data demonstrate that the UVI/UV reduction potential in these com-plexes is modulated over a span of 600 mV, depending linearly on the Lewis acidity of the redox-inactive metal with a sensitivity of 61±9 mV/pKa unit. These findings suggest that interactions with Lewis acids could be effectively leveraged for rational tuning of the electronic and thermochemical properties of the 5f elements, reminiscent of strategies more commonly employed with 3d transition metals.
Research Organization:
Univ. of Kansas, Lawrence, KS (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0019169
OSTI ID:
1600028
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 6 Vol. 142; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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