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Investigation of the Electronic Ground States for a Reduced Pyridine(diimine) Uranium Series: Evidence for a Ligand Tetraanion Stabilized by a Uranium Dimer
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    Investigation of the Electronic Ground States for a Reduced Pyridine(diimine) Uranium Series: Evidence for a Ligand Tetraanion Stabilized by a Uranium Dimer
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    H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
    Department of Chemistry, Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
    § P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
    Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
    School of Earth Sciences, Environmental Earth System Science Department, Stanford University, Stanford, California 94305-4216, United States
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2015, 137, 14, 4690–4700
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    https://doi.org/10.1021/ja511867a
    Published April 1, 2015
    Copyright © 2015 American Chemical Society

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    The electronic structures of a series of highly reduced uranium complexes bearing the redox-active pyridine(diimine) ligand, MesPDIMe (MesPDIMe = 2,6-(2,4,6-Me3-C6H2-N═CMe)2C5H3N) have been investigated. The complexes, (MesPDIMe)UI3(THF) (1), (MesPDIMe)UI2(THF)2 (2), [(MesPDIMe)UI]2 (3), and [(MesPDIMe)U(THF)]2 (4), were examined using electronic and X-ray absorption spectroscopies, magnetometry, and computational analyses. Taken together, these studies suggest that all members of the series contain uranium(IV) centers with 5f 2 configurations and reduced ligand frameworks, specifically [MesPDIMe]•/–, [MesPDIMe]2–, [MesPDIMe]3– and [MesPDIMe]4–, respectively. In the cases of 2, 3, and 4 no unpaired spin density was found on the ligands, indicating a singlet diradical ligand in monomeric 2 and ligand electron spin-pairing through dimerization in 3 and 4. Interaction energies, representing enthalpies of dimerization, of −116.0 and −144.4 kcal mol–1 were calculated using DFT for the monomers of 3 and 4, respectively, showing there is a large stabilization gained by dimerization through uranium–arene bonds. Highlighted in these studies is compound 4, bearing a previously unobserved pyridine(diimine) tetraanion, that was uniquely stabilized by backbonding between uranium cations and the η5-pyridyl ring.

    Copyright © 2015 American Chemical Society

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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2015, 137, 14, 4690–4700
    Click to copy citationCitation copied!
    https://doi.org/10.1021/ja511867a
    Published April 1, 2015
    Copyright © 2015 American Chemical Society

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