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Comparison of Chemical and Interpretative Methods: The Carbon-boron π-Bond as a Test Case

preprint
revised on 11.08.2020 and posted on 11.08.2020 by Radhika Gupta, Elixabete Rezabal, Golshid Hasrack, Gilles Frison
Quantum chemical calculations using DFT and NBO, ETS-NOCV, QTAIM and ELF interpretative approaches have been carried out on X-BH2+ borenium complexes for 39 divalent C-donor ligands X including various N-heterocyclic carbenes and carbones. The C-B bond length and the barrier of rotation around the C-B bond were calculated and compared with various descriptors of the C-B pi-bond strength obtained from the orbital localization, energy partitioning or topological methods. Two families of descriptors emerged: intrinsic indicators, which measure the intensity of the pi-bond in the investigated molecule, and relative indicators, among them the rotational barrier, which compare the studied molecule with its conformer in which the pi-interaction is prevented. Relative indicators are influenced by other interactions in addition to purely pi-interactions. For both families of descriptors, excellent correlations are obtained, showing that the interpretative methods, despite their conceptual differences, describe the same chemical properties. These results also reveal noticeable shortcomings in these methods, and some precautions that need to be taken to interpret their results adequately.

Funding

Genci-Cines Grant A0050806894

History

Email Address of Submitting Author

gilles.frison@polytechnique.edu

Institution

CNRS, Ecole polytechnique, Institut Polytechnique de Paris

Country

France

ORCID For Submitting Author

0000-0002-5677-3569

Declaration of Conflict of Interest

The authors declare no competing financial interest.

Version Notes

pre-print version

Exports