Spectral Differences of the Molecule-ion Adducts of β-Cyclodextrin and Lithium Carbonate  

不同条件下β-环糊精与碳酸锂形成的分子-离子加合物的谱学差异

作　　者：柏雷[1] 宋乐新[1] 王莽[1] 朱林红[1] 

机构地区：[1]中国科学技术大学化学系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2010年第1期117-124,I0002,共9页化学物理学报（英文）

基　　金：ACKNOWLEDGMENTS This work was supported by the Innovation Foundation of Graduate Students in University of Science and Technology of China （No.KD2008020）, and the Natural Science Foundation of Anhui Province （No.090416228）.

摘　　要：A small shielding effect on the hydrogen atoms of chiral carbons of β-cyclodextrin （β-CD） was detected by 1H nuclear magnetic resonance, but a large environmental change of the chiral carbon atoms at high concentration ratios of lithium carbonate （Li2CO3） to β-CD was observed by polarimetry in aqueous solution. These findings urged us to investigate whether different formation conditions of the molecule-ion system between Li2CO3 and β-CD in solid state were involved in different spectral performances. To answer the question, we prepared three adducts of Li2CO3 to β-CD, i.e., samples 1, 2, and 3, by magnetic stirring, solvothermal and grinding conditions, respectively. Powder X-ray diffraction and Fourier transformation infrared spectroscopy provided the information of formation of the three molecule-ion adducts. Besides, scanning electron microscope images provided different surface information of the three adducts. Further, significant spectral differences in thermal behavior of these adducts were found by thermogravimetry and derivative thermogravimetry.

关 键 词：Β-CYCLODEXTRIN Li2CO3 Molecule-ion interaction ADDUCT 

分 类 号：O636.12[理学—高分子化学] O561.1[理学—化学]