We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Similarities and Differences in Benzene Reduction with Ca, Sr, Yb and Sm: Strong Evidence for Tetra‐Anionic Benzene.
- Authors
Thakur, Sandeep Kumar; Roig, Nil; Monreal‐Corona, Roger; Langer, Jens; Alonso, Mercedes; Harder, Sjoerd
- Abstract
Inverse sandwich complexes of Yb and Sm stabilized by a bulky β‐diketiminate (BDI) ligand have been prepared: (BDI)Ln(η6,η6‐C6H6)Ln(BDI); Ln=lanthanide. Coordinated benzene ligands can be neutral, di‐anionic or, often controversially discussed, even tetra‐anionic. The formal charge on benzene is correlated to assignment of the metal oxidation state which generally poses a problem. Herein, we take advantage of the structural similarities found when comparing CaII with YbII, and SrII with SmII complexes. In this work, we found an excellent overlap of the Ca/Yb inverse sandwich structures but a striking difference for the Sr/Sm pair. The much shorter Sm−N and Sm‐C6H6 distances are strong evidence for a SmIII‐benzene−4‐SmIII assignment. This was further supported by NMR spectroscopy, magnetic susceptibility, reactivity and comprehensive computational investigation.
- Subjects
RARE earth metals; BENZENE; SANDWICH construction (Materials); MAGNETIC susceptibility; NUCLEAR magnetic resonance spectroscopy; OXIDATION states
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 25, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202405229