Abstract
The structural geometries of cucurbit[n]uril CB[n] with n = 6–9 and their complexes with oseltamivir (OST) drug were obtained using the density functional theory computations. The stationary points of the most stable complexes were confirmed using vibrational frequency calculation. The complexation energies and electronic properties of CB[n]/OST complexes were investigated. The calculated results indicate that the intermolecular interactions in all the studied complexes occur via a large number of dipole–dipole interactions, especially hydrogen bonds between oxygen atoms of CB[n] and hydrogen atoms of amine of oseltamivir drug. The negative complexation energies of CB[n]/OST complexes in both gas and water phases indicate that the host–guest complexes are exothermic process and the complexes are more stable than its bare CB[n]. In addition, the CB[7]/OST complex is more stable than that of all studied CB[n]/OST complexes. The frequency calculation results of the most stable complexes for each of CBs indicate that complexations occur via a spontaneous process. The NBO analysis of complexes shows the transferring of partial charge from CB[n]s to oseltamivir which correspond to their MEP contours. The HOMO and the LUMO orbitals are localized on the oseltamivir in CB[n]/OST complexes. After drug complexation, the electronic properties also display that the energy gaps of CB[n] are significantly changed. All of the complexation properties point out that CB[n]s can act as a host for appropriately oseltamivir guest, even in aqueous solution.
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This research project was financially supported by Mahasarakham University 2021, Thailand.
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W. Rakrai and B. Wanno contributed to the study conception and design. The DFT calculations were performed by W. Rakrai, C. Tabtimsai, and B. Wanno. The data analysis and the first draft of the manuscript were made by W. Rakrai and B. Wanno. Revising the manuscript critically for important intellectual content on subsequent versions of the manuscript has been done by W. Rakrai, C. Kaewtong, and B. Wanno. All the authors read and approved the final manuscript.
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Rakrai, W., Tabtimsai, C., Kaewtong, C. et al. Theoretical investigation of the complexation, structural, and electronic properties of complexes between oseltamivir drug and cucurbit[n = 6–9]urils. Struct Chem 33, 757–768 (2022). https://doi.org/10.1007/s11224-022-01888-1
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DOI: https://doi.org/10.1007/s11224-022-01888-1