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Citation: Wang Hui, Mei Ming-Hua, Xie Hong-Zhi, Fang Yu, Zhang Xiao-Hong, Wu Shi-Kang. Photo-physical Behavior of Modified β-Cyclodextrin by Dimethylamino Chalcone in Different Solvents[J]. Acta Physico-Chimica Sinica, ;2002, 18(06): 495-499. doi: 10.3866/PKU.WHXB20020604 shu

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

1.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing　100101;Department of Chemistry, Shaanxi Normal University, Xi’an　710061

Received Date: 25 October 2001
Available Online: 15 June 2002

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.
- Modified β-cyclodextrin;Transition metal ion;Molecular recognition;Fluorescence quenching
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