Geng Qing-Xia, Wang Fang, Cong Hang, Tao Zhu, Wei Gang
Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, P.R. China.
CSIRO Manufacturing Flagship, P.O. Box 218, Lindfield, NSW 2070, Australia.
Org Biomol Chem. 2016 Feb 28;14(8):2556-62. doi: 10.1039/c5ob02590g.
The host-guest interaction of cucurbit[8]uril (Q[8]) with a synthesized guest molecule, consisting of naphthalene and viologen moieties bridged by a carbon oxygen chain, was investigated by (1)H NMR and UV-Vis spectroscopy. The results indicated the formation of an inclusion complex in a ratio of 1 : 1 with a moderate association constant of Ka = (1.1 ± 0.2) × 10(6) L mol(-1). The formation of this special complex is driven by the markedly enhanced charge-transfer interaction between the electron-rich and electron-deficient guest molecule inside the hydrophobic cavity of Q[8], while the carbon oxygen chain stays outside of Q[8] to form a supramolecular crown ether. Screening of the metal cation substrate suggested that the inclusion complex recognizes Ag(+) ions with high selectivity, as shown by UV-Vis spectroscopy.
通过核磁共振氢谱（¹H NMR）和紫外可见光谱（UV-Vis）研究了葫芦[8]脲（Q[8]）与一种由萘和紫精基团通过碳氧链连接而成的合成客体分子之间的主客体相互作用。结果表明形成了比例为1 : 1的包合物，其缔合常数适中，Ka = (1.1 ± 0.2) × 10⁶ L mol⁻¹。这种特殊配合物的形成是由Q[8]疏水腔内富电子和缺电子客体分子之间显著增强的电荷转移相互作用驱动的，而碳氧链则留在Q[8]外部形成超分子冠醚。对金属阳离子底物的筛选表明，如紫外可见光谱所示，该包合物对Ag⁺离子具有高选择性识别能力。
