Kang Yuetong, Tang Xiaoyan, Yu Hongde, Cai Zhengguo, Huang Zehuan, Wang Dong, Xu Jiang-Fei, Zhang Xi
Key Lab of Optoelectronics and Molecular Engineering , Department of Chemistry , Tsinghua University , Beijing 100084 , China . Email:
Chem Sci. 2017 Dec 1;8(12):8357-8361. doi: 10.1039/c7sc04125j. Epub 2017 Oct 13.
Supramolecular catalysis aims to modulate chemical reactions on both selectivity and rate by taking advantage of supramolecular chemistry. However, due to the effect of product inhibition, supramolecular catalysts are usually added in stoichiometric amounts. Herein, we report a supramolecular catalysis system in which 1% of the supramolecular catalyst, cucurbit[8]uril, is able to significantly accelerate the photodimerization of Brooker's merocyanine. This catalytic process is realized in a cyclic manner because the photodimerized product can be spontaneously replaced by monomeric reactants competitive host-guest complexation. Thus, a catalytic amount of cucurbit[8]uril is sufficient to accomplish photodimerization within 10 min. This line of research will enrich the field of supramolecular catalysis and allow the development of more efficient catalytic systems.
超分子催化旨在通过利用超分子化学来调节化学反应的选择性和速率。然而，由于产物抑制的影响，超分子催化剂通常按化学计量添加。在此，我们报道了一种超分子催化体系，其中1%的超分子催化剂葫芦[8]脲能够显著加速布鲁克部花青的光二聚反应。由于光二聚产物可通过竞争性主客体络合被单体反应物自发取代，该催化过程以循环方式实现。因此，催化量的葫芦[8]脲足以在10分钟内完成光二聚反应。这一系列研究将丰富超分子催化领域，并推动更高效催化体系的发展。
