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The formation of a 1:1 supramolecular complex betweenβ-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 ofβ-CD.Also,the degradation process including the degree of degradation and the degradation products of the complex was carefully compared with those ofβ-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 ofβ-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 moleculeβ-CD as the host via molecular assembly between them.

Formation, Structure and Thermal Degradation of the Supramolecular Complex between <em>&beta;</em>-Cyclodextrin and 18-Crown-6

Formation, Structure and Thermal Degradation of the Supramolecular Complex between <em>β</em>-Cyclodextrin and 18-Crown-6