A comparative study of complexation of beta-cyclodextrin, calix[4]arenesulfonate and cucurbit[7]uril with dye guests: Fluorescence behavior and binding ability

作者：Liu Yu^*; Li Chunju; Guo Dong Sheng; Pan Zhong Huai; Li Zhe

来源：Supramolecular Chemistry, 2007, 19(7): 517-523.

DOI：10.1080/10610270601145444

• dye
• fluorescence behavior
• cyclodextrin
• calixarene
• cucurbituril

The complexation behaviors of acridine red (AR), neutral red (NR) and rhodamine B (RhB) dye guest molecules by three kinds of supramolecular hosts, including beta-cyclodextrin (beta-CD), calix[4]arene tetrasulfonate (C4AS) and cucurbit[7]uril (CB[7]), have been investigated by means of fluorescence spectra in aqueous citrate buffer solution (pH 6.0). The results obtained show that the three hosts, possessing different types of cavity, lead to various complexation-induced fluorescence of dye guests, and present different binding ability and molecular selectivity. The complexation stability constants decrease in the order of NR > AR > RhB for C4AS and CB[7] hosts, while in the order of RhB > AR > NR for beta-CD host. Particularly, CB[7] displays the strongest binding ability with NR (Ks = 33300 M-1) and provides the molecular selectivity of 4.8 for NR/AR pairs. Although the binding ability of C4AS for present dye guests is weaker than CB[7], but the molecular selectivity of the two hosts are nearly equivalent. beta-CD shows stronger binding ability with RhB (Ks = 5880 M-1) as comparison with CB[7] and C4AS. Furthermore, the solvent effects and salt effects during the course of complexation have also been investigated.

• 出版日期2007-11
• 单位南开大学