Kinetic studies of the thermal dissociation of beta-cyclodextrin-cinnamyl alcohol inclusion complex

The stability of beta-cyclodextrin-cinnamyl alcohol inclusion complex (beta-CD . C9H10. 8H(2)O) was investigated using TG and DSC. The mass loss took place in three stages: the dehydration occurred between 50-120 degrees C; the dissociation of beta-CD . C9H10O occurred in the range of 210-260 degrees C; and the decomposition of beta-CD began at 280 degrees C. The dissociation of beta-CD . C9H10O was studied by means of thermogravimetry, and the results showed: the dissociation of PCD CD . C9H10O was dominated by a two-dimensional diffusion process (D-2). The activation energy E was 161.2 kJ mol(-1), the pre-exponential factor A was 4.5 x 10(13) min(-1). Cyclodextrin is able to form inclusion complexes with a great variety of guest molecules, and the interesting of studies focussed on the energy binding cyclodextrin and the guest molecule. In this paper, beta-cyclodextrin-cinnamyl alcohol inclusion complex was studied by fluorescence spectrophotometry and infrared absorption spectroscopy, and the results show: the stable energy of inclusion complexes of beta-CD with weakly polar guest molecules consists mainly of Van der Waals interaction.