In order to investigate the contribution of the hydrophilic parts of guest molecules of aliphatic complexes to the inclusion reaction, the thermodynamic properties of inclusion complexes of cyclodextrin (α-CD) with aliphatic nitriles [H(CH2) nCN: n = 1–8] into the α-CD cavity in dilute aqueous solutions were measured by a micro-calorimeter at 298.15 K. The thermodynamic properties of inclusion for the octane nitrile system were different from those of others. The inclusion process of aliphatic nitriles to α-CD has two kinds of major driving force of enthalpy and entropy driven inclusion. The interaction energies of inclusion complexes of α-CD and aliphatic nitriles were determined by DFT calculation (B3LYP/6-31++G (d,p)) in water and compared with the experimental results. DFT calculations were performed on the inclusion complexes of α-CD with seven nitriles of each conformer. Both the gas phase interaction and solvent effect were taken into consideration. Also non-polar interactions between aliphatic nitriles + α-CD in aqueous solution were calculated and herein the inclusion energy is discussed.
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