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Spectral Differences of the Molecule-ion Adducts of β-Cyclodextrin and Lithium Carbonate
Lei Bai,Le-xin Song*,Mang Wang,Lin-hong Zhu
Author NameAffiliationE-mail
Lei Bai Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Le-xin Song* Department of Chemistry, University of Science and Technology of China, Hefei 230026, China solexin@ustc.edu.cn 
Mang Wang Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Lin-hong Zhu Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Abstract:
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.
Key words:  β-Cyclodextrin, Li2CO3, Molecule-ion interaction, Adduct
FundProject:
Spectral Differences of the Molecule-ion Adducts of β-Cyclodextrin and Lithium Carbonate
柏雷,宋乐新*,王莽,朱林红
摘要:
分别在磁力搅拌、水热和研磨条件下制得了碳酸锂和β-环糊精的三个加合物1、2和3.粉末X射线衍射和傅立叶变换红外显示了三个加合物的形成信息及其谱学差异.SEM提供了它们不同于β-环糊精的表面结构.热重和微分热重显示这些加合物在热稳定性上存在着较大差异.
关键词:  β-环糊精,碳酸锂,分子-离子相互作用,加合物
DOI:10.1088/1674-0068/23/01/117-124
分类号: