Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (2): 103-108.     Next Articles

Original Articles

联喹啉桥联双环糊精对染料客体分子的协同键合

宋芸,刘育*   

  1. (南开大学化学系 元素有机化学国家重点实验室 天津 300071)
  • 投稿日期:2004-06-01 修回日期:2004-09-21 发布日期:2010-12-10
  • 通讯作者: 刘育

Cooperative Binding of Dyes by Biquinolino Modified β-cyclodextrin Dimers

SONG Yun,LIU Yu*   

  1. Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071)
  • Received:2004-06-01 Revised:2004-09-21 Published:2010-12-10
  • Contact: LIU Yu*

The complex stability constants for the 1∶1 inclusion complexation of 2,2'-biquinoline-4,4'- dicarboxy-bridged bis(

β

-cyclodextrin)s with dye guests have been determined by means of fluorescent titration at 25 ℃ in phosphate buffer solution (pH 7.2). Possessing more rigid and bigger

β

-electron systems of tethers, biquinolino-modified

β

-cyclodextrin dimers can form more stable complexes with not only the T-shaped RhB but also the linear guest AR than the corresponding bipyridino-tethered bis(

β

-cyclodextrin)s. 2D NMR investigations for the complexation between host and guest validated the cooperative binding of bis(

β

-cyclodextrin)s with dye guests. The inclusion complexation behaviors of bis(

β

-cyclodextrin)s with dyes were discussed from the viewpoints of size/shape-fitting relationship between host and guest as well as the cooperative contribution of several weak forces.

Key words: bridged bis(β-cyclodextrin), fluorescence titration, molecular recognition, dye, supramolecular chemistry