Interaction of Cucurbit[n=7, 8] with Methylindoles via Fluorescence Spectroscopy
HOU Hua-li, XUE Sai-feng*, MU Lan, TAO Zhu
Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Institute of Applied Chemistry，Guiyang 550025, China
Abstract：In the present work, the authors investigated interaction of cucurbit[n=7, 8]urils(Q[7], Q[8]) with 2-methylindol(Me) and 3-methylindol(Sk), influences of pH and temperature on the interaction of Q[7], Q[8] with the guests and calculations of the stability constants and thermodynamic parameters by using fluorescence spctroscopy. The results show that: the interation ratios are 1∶1 of host: guest for all systems, except the Q[8]-Sk system, for which the ratio is 1∶2 of host: guest; the interaction ratios of the host: guest systems did not change in the range of pH 1~11 and temperature between 298 and 313 K; the stability constant is the largest at pH 1 and room temperature. The thermodynamic parameter revealed that the interaction of the host and the guest of spontaneitied.
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