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The fluorescence quenching of dimethylaminochalcone modified β-cyclodextrin (DMAC-CD) by different transition metal ions in various solvents has been studied. We found that the modified β-cyclodextrin had the specific ability to recognize Cu 2+ ions in the aqueous solution and the quenching constant was about one order of magnitude higher than those of other metals studied in this work. In the non-aqueous solvents, such as in DMF, the specific ability of recognizing Cu 2+ ions was vanished. However, the Ni 2+ ion with a planar square electronic configuration presents the highest ability for the complex formation. It could be concerned with the planar square configuration formed from the four hetero-atoms in the linking chains of modified β-cyclodextrin. In this work, we demonstrate that the spatial matching in the structure between host and guest plays a very important role in the complex formation process.

A study on the fluorescence quenching of modified ß-cyclodextrin by transition metal ions in different solvents