荧光光谱法考察七、八元瓜环与甲基吲哚的相互作用

摘要

利用荧光光谱法考察了七、八元瓜环(Cucurbit[n=7,8]urils,Q[7],Q[8])与客体2-甲基吲哚(2-methylindol,Me)和3-甲基吲哚(3-methylindol,Sk)的相互作用;同时研究了体系pH以及温度对Q[7]和Q[8]与客体相互作用的影响;并计算了相应的稳定常数及热力学参数等.实验结果表明:除Q[8]与Sk作用比为1∶2外,其余主客体的作用比均为1∶1;在pH值为1～11,温度为298～313 K的范围内上述体系的作用比不变;在pH 1和室温条件下,作用体系的稳定常数较大;通过热力学参数的测定可知上述主客体的相互作用均是自发进行.%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], 0[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.