title: [Interaction of cucurbit [n = 7, 8] with methylindoles via fluorescence spectroscopy].
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.
authors.affiliation: Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Institute of Applied Chemistry, Guiyang 550025, China. houhuali2009@163.com
authors.forename: Hua-Li
authors.initials: HL
authors.lastname: Hou
authors.forename: Sai-Feng
authors.initials: SF
authors.lastname: Xue
authors.forename: Lan
authors.initials: L
authors.lastname: Mu
authors.forename: Zhu
authors.initials: Z
authors.lastname: Tao