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Similarities and Differences in Benzene Reduction with Ca, Sr, Yb and Sm: Strong Evidence for Tetra-Anionic Benzene

Thakur SK, Roig N, Monreal-Corona R, Langer J, Alonso M, Harder S (2024)

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Publication Type: Journal article

Publication year: 2024

Journal

DOI: 10.1002/anie.202405229

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 Ca^II with Yb^II, and Sr^II with Sm^II 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 Sm^III-benzene⁻⁴-Sm^III assignment. This was further supported by NMR spectroscopy, magnetic susceptibility, reactivity and comprehensive computational investigation.

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How to cite

APA:

Thakur, S.K., Roig, N., Monreal-Corona, R., Langer, J., Alonso, M., & Harder, S. (2024). Similarities and Differences in Benzene Reduction with Ca, Sr, Yb and Sm: Strong Evidence for Tetra-Anionic Benzene. Angewandte Chemie International Edition. https://doi.org/10.1002/anie.202405229

MLA:

Thakur, Sandeep Kumar, et al. "Similarities and Differences in Benzene Reduction with Ca, Sr, Yb and Sm: Strong Evidence for Tetra-Anionic Benzene." Angewandte Chemie International Edition (2024).

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