The Interaction of Cucurbit[8]uril with Thionine and Carbendazim with Spectroscopic Method
XI Yun-yun1, 2, TANG Qing1, HUANG Ying1, 2*, TAO Zhu2, XUE Sai-feng2, ZHU Qian-jiang2
1. The Engineering and Research Center for Southwest Bio-Pharmaceutical Resources Ministry of Education of Guizhou University, Guiyang 550025, China 2. Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou University, Guiyang 550025, China
Abstract：In this paper, the interaction of cucurbit [8]uril(Q[8]) with thionine (TH) and carbendazim (CBZ) were investigated with fluorescence and UV-Vis spectroscopy. The experimental results showed that the inclusion complex between Q[8] and TH informed was at molar ratios of 1∶2 in 0.01 mol·L-1 hydrochloric acid solution. The fluorescence intensity of the Q[8]/TH complexes quenched when Q[8] was added to TH solution, but fluorescence increasing of the Q[8]/TH complex with the addition of CBZ was observed. The fluorescence increasing values show a good linear relationship with the CBZ concentration within 0~3.5 μmol·L-1. The linear regression equation relating fluorescence intensity (If) to CBZ concentration (c) is If=0.45c+32.24 (r=0.999). The detection limit was 9.39×10-8 mol·L-1. Forthemore, the influence of foreign species on the analytical signal of the Q[8]/TH complex in the presence of carbendazim was established. No interference was observed from commonly used foreign species such as metal ions (Fe3+, Mg2+, Ca2+). In particular, benzimidazole compounds thiabendazole and fuberidazole do not interfere with CBZ determination at a specific concentration. The results revealed that complexation of Q[8] and TH with CBZ offers a fluorescent switching “on-off” effect which will supply a potential application in pesticide residues test.
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