Abstract
Structure and stability of an inclusion complex formed by Benzocaine (BZC) and β-cyclodextrin (β-CD) were investigated computationally using different levels of theory. The conformational research based on PM6 method allowed reach two minimum-energy structures: model A and model B. The lowest conformers have been exposed to fully geometry optimization employing four DFT functionals: B3LYP, CAM-B3LYP, M05-2X and M06-2X. The performed DFT calculations have identified the model B, in which the amino group is located at the primary face of β-CD, as the most stable complex by an amount up to −40 kcal/mol. Further, the greater stabilization of model B in respect to model A, has been ascertained through AIM and NBO analyses which clarified the main hydrogen bonds HBs interactions governing the reactivity of BZC inside the hydrophobic cavity of β-CD. Finally, the estimated isotropic 1H nuclear magnetic shielding constants generated from the gauge-including-atomic-orbital calculation have been analyzed and then compared with the available experimental data.
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The authors would like to thank the General Direction of Scientific Research and Technological Development (DGRSDT) and the National Research Fund (FNR) for funding this work, through project PNR (8/u23/830).
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Attoui Yahia, H., Attoui Yahia, O., Khatmi, D. et al. Quantum chemical investigations on hydrogen bonding interactions established in the inclusion complex β-cyclodextrin/benzocaine through the DFT, AIM and NBO approaches. J Incl Phenom Macrocycl Chem 89, 353–365 (2017). https://doi.org/10.1007/s10847-017-0753-1
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DOI: https://doi.org/10.1007/s10847-017-0753-1