作者:Carmen Talotta、Margherita De Rosa、Annunziata Soriente、Aldo Spinella、Carmine Gaeta、Placido Neri
DOI:10.1080/10610278.2018.1529316
日期:2019.1.2
The synthesis of a [2]rotaxane, comprising a calix[6]arene-wheel and a dibenzyl-ammonium axle, is here reported. By virtue of its inherent directionality, the calix-wheel makes non-degenerate two equivalent stations of the symmetrical axle. In this way, the neutral rotaxane shows two co-conformations, named endo-alkyl and endo-benzyl, in which an alkyl or benzyl moiety of the axle are included inside the calix-cavity, respectively. NMR and DFT studies showed that the co-conformation preferred by the neutral mechanomolecule is the endo-alkyl' one, which is more stabilized by C-H interactions between the included alkyl chain and the aromatic wall of the calix-cavity.[GRAPHICS].