Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (06): 495-499.doi: 10.3866/PKU.WHXB20020604

• ARTICLE • Previous Articles     Next Articles

Photo-physical Behavior of Modified β-Cyclodextrin by Dimethylamino Chalcone in Different Solvents

Wang Hui;Mei Ming-Hua;Xie Hong-Zhi;Fang Yu;Zhang Xiao-Hong;Wu Shi-Kang   

  1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101;Department of Chemistry, Shaanxi Normal University, Xi’an 710061
  • Received:2001-10-25 Revised:2001-12-12 Published:2002-06-15
  • Contact: Wu Shi-Kang

Abstract: The fluorescence quenching of dimethylamino chalcone modified β-cyclodextrin by different transition metal ions in various solvents has been studied. It was found that the modified β-cyclodextrin has a specific recognition ability to Cu2+ in aqueous solution, and the quenching constant is about one order of magnitude larger than that of other metals which were studied in this work. But in non-aqueous solvents, such as in DMF, the specific recognition ability of Cu2+ disappeared. And the Ni2+, which has a planar configuration, presented the strongest ability of complex formation. It was resulted from the four ethylene groups connected each other by hetero-atom in linking chain of the modified β-cyclodextrin to make the formation of planar square configuration easily. The results demonstrated that the possibility of the special structure match of the host and the guest plays a very important role in the complex formation.

Key words: Modified β-cyclodextrin, Transition metal ion, Molecular recognition, Fluorescence quenching