Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (13): 1247-1251. Previous Articles     Next Articles

微量热法研究β-环糊精与3-烷氧基-2-羟丙基三甲基溴化铵的相互作用

孙得志, 王世兵, 魏西莲, 尹宝霖, 李林尉   

  1. 聊城大学化学化工学院, 聊城, 252059
  • 投稿日期:2003-06-06 修回日期:2004-01-02 发布日期:2014-02-17
  • 通讯作者: 孙得志,E-mail:sundezhisdz@163.com;dzsun@eyou.com;Fax:0635-8239121. E-mail:sundezhisdz@163.com

Study of Host-Guest Complexation between β-Cyclodextrin and 3-Alkoxyl-2-hydroxypropyl Trimethyl Ammonium Bromides in Aqueous Solutions with Microcalorimetry

SUN De-Zhi, WANG Shi-Bing, WEI Xi-Lian, YIN Bao-Lin, LI Lin-Wei   

  1. Department of Chemistry, Liaocheng University, Liaocheng 252059
  • Received:2003-06-06 Revised:2004-01-02 Published:2014-02-17

Interactions between β-cyclodextrin (β-CD) and 3-alkoxyl-2-hydroxypropyl trimethyl ammonium bromides (CnNBr), a new kind of surfactants synthesized in this laboratory, in aqueous solutions were investigated with titration microcalorimetry at 298.15 K.The results were discussed in the light of hydrophobic interaction of β-CD with CnNBr and the iceberg structure made up of water molecules around hydrophobic tail of the surfactant.Stoichiometry of the host-guest complex changes from 1:1 to 2:1 as the number of carbon atoms (n) in hydrophobic chain, CnH2n+1O, increases from 8 to 14.All the complexes are quite stable with the apparent experiential stability constants being β1=1.08×103 dm 3·mol-1, β1=28.66×103 dm3·mol-1 and β2=141.9×103 dm 6·mol-2, respectively for n=8, 12, 14.All the complexation processes are proved to be both enthalpy and entropy beneficial, and the standard thermal effect increases, while standard entropy change decreases, with the hydrophobic chain becoming longer.

Key words: β-cyclodextrin, 3-alkoxyl-2-hydroxypropyl, microcalorimetry, host-guest complex