She Shan, Li Mu, Li Qi, Huang Zehuan, Wei Yongge, Yin Panchao

    我们研究发现，一个卤素离子可以与纳米尺度的anderson型多酸的表面结合，在溶液中形成稳定的复合物。这种结合的结合常数为K=1.53×10³。单晶衍射分析显示这种结合行为是卤素离子和anderson型多酸未被覆盖的一面的三个羟基通过多重氢键作用相结合。这种多酸体系中存在的超分子作用意味着其催化作用可以通过引入卤素离子和水分子实现转换。其中，卤素离子通过屏蔽多酸的活性位点来阻止催化能力，水分子的加入又可以重新活化多酸。

    Our research one halide ion (X^-) can bind on the surface of nanoscale Anderson-type POMs ([(n-C₄H₉)₄N]₃{AlMo₆O₁₈(OH)₃[(OCH₂)₃CCH₃]}, and form stable complexes in solutions with binding constant K=1.53×10³. Single-crystal structural analysis showed that this binding behavior occurs through multiple hydrogen bonding between X-and three hydroxy groups on the uncapped side of the cluster. This supramolecular interaction in the cluster systems means that their catalytic activities, evaluated from the oxidation of alcohols to aldehydes, can be switched upon the introduction of halide ions and water molecules. The halide ions work as inhibitors by blocking the active sites of the clusters while they can be re-activated by the addition of water.

    文章链接：https://onlinelibrary.wiley.com/doi/abs/10.1002/cplu.201900307