Recognition Selectivities of Lasso-Type Pseudo[1]rotaxane Based on a Mono-Ester-Functionalized Pillar[5]arene

Molecules

Yan Huang¹  Wen-Gui Duan²  Wen-Xue Zhang²  Lu-Zhi Liu²  Cui-Guang Ma²  Qing-Qing Zhou² 

[1] Guangxi Institute of Chinese Traditional Medical &School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;

关键词: pillar[5]arenes;    pseudo[1]rotaxane;    host–guest behavior;    self-assembly;   

DOI  :  10.3390/molecules24152693

来源: DOAJ

【 摘 要 】

Two types of mono-ester-functionalized pillar[5]arenes, P1 and P2, bearing different side-chain groups, were synthesized. Their host−guest complexation and self-inclusion properties were studied by ¹H NMR and 2D nuclear overhauser effect spectroscopy (NOESY) NMR measurements. The results showed that the substituents on their phenolic units have a great influence on the self-assembly of both pillar[5]arenes, although they both could form stable pseudo[1]rotaxanes at room temperature. When eight bulky 4-brombutyloxy groups were capped on the cavity, instead of methoxy groups, pseudo[1]rotaxane P1 became less stable and its locked ester group in the inner space of cavity was not as deep as P2, leading to distinctly different host−guest properties between P1 and P2 with 1,6-dibromohexane. Moreover, pillar[5]arene P1 displayed effective molecular recognition toward 1,6-dichlorohexane and 1,2-bromoethane among the guest dihalides. In addition, the self-complex models and stabilities between P1 and P2 were also studied by computational modeling and experimental calculations.

【 授权许可】

Unknown