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New Insights into Re3(μ-Cl)3Cl6 Aromaticity. Evidence of σ- and π‑Diatropicity

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journal contribution
posted on 17.12.2015, 10:29 by Alejandro Vásquez-Espinal, Ricardo Pino-Rios, Luis Alvarez-Thon, Walter A. Rabanal-León, Juan J. Torres-Vega, Ramiro Arratia-Perez, William Tiznado
We have theoretically evaluated the behavior of the Re3(μ-Cl)3Cl6 cluster under magnetic perturbation, and it clearly shows that the magnetic response within the Re3(μ-Cl)3 plane is highly diatropic in nature. An analysis of both the magnetically induced current density (MICD) and induced magnetic field (Bind) allows us to classify this cluster as doubly σ- and also π-aromatic on the magnetic criterion. These findings contradict the classical Re–Re double bond representation and favor a chemical bonding pattern that involves delocalized bonds.