Investigation of the Electronic Ground States for a Reduced Pyridine(diimine) Uranium Series: Evidence for a Ligand Tetraanion Stabilized by a Uranium DimerClick to copy article linkArticle link copied!
- Nickolas H. Anderson
- Samuel O. Odoh
- Ursula J. Williams
- Andrew J. Lewis
- Gregory L. Wagner
- Juan Lezama Pacheco
- Stosh A. Kozimor
- Laura Gagliardi
- Eric J. Schelter
- Suzanne C. Bart
Abstract

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.
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