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Joint experimental and theoretical studies of the surprising stability of the aryl pentazole upon noncovalent binding to β-cyclodextrin

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Abstract

Herein, binding of the β-cyclodextrin (β-CD) host to the unstable aryl pentazole guest has been confirmed experimentally and theoretically. After the confinement of aryl pentazole, electron density reorganization was studied by M06-2X dispersion-corrected DFT and further reflected in the characteristic shift in the NMR spectra. Among the host–guest complexes, the inclusion complex is favored with the phenyl ring expectedly encapsulated within the cavity through noncovalent interactions such as hydrogen bonding, C–H⋯π, and the special Csp2–H⋯H–Csp3 bonding discovered by the NBO, QTAIM, and NCI-RDG theories. The host–guest binding renders the enhancement of the nitrogen-ring aromatic character; this has been analyzed by employing nucleus-independent chemical shift (NICS)-based profiles. The non-covalent interaction largely enhances the thermal stability of the guest through a change of the decomposition reaction path whether the guest is encapsulated or not by the host. By comparison of the structures of B1–B4, the enhancement could be assigned to the ion-type transition structure stabilized by the C–H bonds of the host.

Graphical abstract: Joint experimental and theoretical studies of the surprising stability of the aryl pentazole upon noncovalent binding to β-cyclodextrin

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Publication details

The article was received on 06 Sep 2017, accepted on 27 Oct 2017 and first published on 27 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05783K
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Joint experimental and theoretical studies of the surprising stability of the aryl pentazole upon noncovalent binding to β-cyclodextrin

    Y. Yang, X. Liu, R. Zhang and S. Pang, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP05783K

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