Guo Dong-Sheng, Wang Li-Hua, Liu Yu
Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
J Org Chem. 2007 Sep 28;72(20):7775-8. doi: 10.1021/jo701304g. Epub 2007 Sep 7.
The binding behaviors and thermodynamic origins of p-sulfonatocalix[4]arene (C4AS) and p-sulfonatocalix[5]arene (C5AS) with methyl viologen (MV2+) have been investigated by the methods of isothermal titration calorimetry, NMR, and cyclic voltammetry, showing that the binding abilities of C4AS and C5AS and their host selectivity are dramatically pH-controlled, which is closely discussed from the viewpoint of thermodynamics. Moreover, the radical form of MV+* can also be effectively included by C4AS and C5AS.
通过等温滴定量热法、核磁共振和循环伏安法研究了对磺酸基杯[4]芳烃（C4AS）和对磺酸基杯[5]芳烃（C5AS）与甲基紫精（MV2+）的结合行为及热力学起源，结果表明C4AS和C5AS的结合能力及其主体选择性受pH显著控制，并从热力学角度进行了深入讨论。此外，MV+*的自由基形式也能被C4AS和C5AS有效包合。
