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• W2328037009 abstract "Binding of hydrocarbon guests to supramolecular hosts can lead to unusual geometric changes such as bending or coiling of guests upon encapsulation. Cucurbiturils (CBs) are classic cation binders that were recently used for the selective binding of small-membered hydrocarbons with a very high association constant (Ka ≈ 106 M–1). In this study, we have systematically investigated the binding of some alkanes to CB-[6] using a series of quantum chemical methods. The calculated binding free energies are very strong and are largely influenced by guest orientations inside the host and reorganization of host and guests. The computed 1H NMR chemical shifts of the encapsulated alkanes agree with the experimental estimates thus confirming guest encapsulation. Further, we have shown that although binding of both cyclopentane and neopentane have very strong binding affinities (>20 kcal mol–1), the selectivity of cyclopentane to neopentane at CB-[6] is a kinetically driven process through the computation of approximate transition state structures of both alkanes to CB-[6]. The calculated binding affinities with dispersion corrected density functionals (DFs) are very close to the experimental estimates, whereas DFs that lack dispersion correction predict that alkane binding to CB-[6] is largely unfavorable. Finally, we have investigated the binding of some long chain alkanes to several supramolecular hosts using dispersion corrected semiempirical methods which cannot be routinely studied through density functional theory methods due to the larger size of the system." @default.
• W2328037009 created "2016-06-24" @default.
• W2328037009 creator A5010561359 @default.
• W2328037009 date "2013-10-11" @default.
• W2328037009 modified "2023-09-28" @default.
• W2328037009 title "Quantum Chemical Challenges for the Binding of Simple Alkanes to Supramolecular Hosts" @default.
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• W2328037009 doi "https://doi.org/10.1021/jp405113j" @default.
• W2328037009 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24073855" @default.
• W2328037009 hasPublicationYear "2013" @default.
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