Clip[5]arenes: A new family of molecular clips

摘要

Here we report the design and syntheses of two new triptycene-based rigid acyclic C-shaped hosts, clip [5]arenes C[5]OH and C[5]ME, and the strong host-guest complexation between C[5]OH and an electronpoor bipyridinium salt, paraquat G. The K-a value for the host-guest complex C[5] OH superset of G was calculated to be (1.09 +/- 0.36) x 10(5) M-1 in acetone by using a non-linear curve-fitting method based on the UV-vis absorption titration experiments. Furthermore, based on this new host-guest recognition motif, a novel pseudopolyrotaxane-like supramolecular structure was constructed with C[5]OH threaded on polyviologen polymer VP-10. (C) 2018 Elsevier Ltd. All rights reserved.