Citation: ZHU Lin-Hong, SONG Le-Xin, CHEN Jie, YANG Jing, WANG Mang. Formation, Structure and Thermal Degradation of the Supramolecular Complex between β-Cyclodextrin and 18-Crown-6[J]. Acta Physico-Chimica Sinica, ;2011, 27(07): 1579-1586. doi: 10.3866/PKU.WHXB20110727
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The formation of a 1:1 supramolecular complex between β-cyclodextrin (β-CD) and 18- crown-6 (18C6) by simply mixing them was confirmed by elemental analysis, 1H nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectrometry. The probable interaction sites between these species were determined by two-dimensional rotating frame nuclear Overhauser effect spectroscopy (ROESY), which showed that 18C6 tended to be located on the narrow end of the cavity of β-CD. Also, the degradation process including the degree of degradation and the degradation products of the complex was carefully compared with those of β-CD and 18C6 through thermogravimetric analysis and gas chromatography coupled to time-of-flight mass spectrometry. The experimental data indicated that the presence of 18C6 resulted in an earlier degradation of β-CD. Furthermore, the relative abundance of larger fragments from the degradation process of the two components was reduced drastically because of an intermolecular interaction. These results strongly indicate that a supramolecular complex can be constructed using the flexible macrocyclic molecule 18C6 as a guest and the rigid macrocyclic molecule β-CD as the host via molecular assembly between them.
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