A thermogravimetric analysis (TGA) method developed for estimating the stoichiometric ratio of solid-state 伪-cyclodextrin-based inclusion complexes

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• 作者：Yuxiang Bai^a ; Jinpeng Wang^a ; Mohanad Bashari^a ; Xiuting Hu^a ; Tao Feng^b ; Xueming Xu^a ; Zhengyu Jin^a ; ^{jinlab2008@yahoo.com} ; Yaoqi Tian^a ; ^{yqtian@jiangnan.edu.cn}
• 关键词：Thermogravimetric analysis ; 伪-CD-based inclusion complex ; Small guest ; Fourier transform-infrared ; X-ray diffraction ; NMR
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：10 August, 2012
• 卷：541
• 期：Complete
• 页码：62-69
• 文件大小：1331 K

摘要

An approach mainly based on thermogravimetric analysis (TGA) was developed to evaluate the stoichiometric ratio (SR, guest to host) of the guest-伪-cyclodextrin (Guest-伪-CD) inclusion complexes (4-cresol-伪-CD, benzyl alcohol-伪-CD, ferrocene-伪-CD and decanoic acid-伪-CD). The present data obtained from Fourier transform-infrared (FT-IR) spectroscopy showed that all the 伪-CD-based inclusion complexes were successfully prepared in a solid-state form. The stoichiometric ratios of 伪-CD to the relative guests (4-cresol, benzyl alcohol, ferrocene and decanoic acid) determined by the developed method were 1:1, 1:2, 2:1 and 1:2, respectively. These SR data were well demonstrated by the previously reported X-ray diffraction (XRD) method and the NMR confirmatory experiments, except the SR of decanoic acid with a larger size and longer chain was not consistent. It is, therefore, suggested that the TGA-based method is applicable to follow the stoichiometric ratio of the polycrystalline 伪-CD-based inclusion complexes with smaller and shorter chain guests.