Multiple noncovalent interaction constructed polymeric supramolecular crystals: recognition of butyl viologen by para-dicyclohexanocucurbit[6]uril and α,α′,δ,δ′-tetramethylcucurbit[6]uril†
d
Xin
Xiao
*c
Abstract
Binding interactions of butyl viologen (BV+) with para-dicyclohexanocucurbit[6]uril (Cy2Q[6]) and α,α′,δ,δ′-tetramethyl cucurbit[6]uril (TMeQ[6]) were investigated by 1H NMR spectroscopy, isothermal titration calorimetry (ITC) and X-ray crystallography. In the solid state, the BV+ guest and both hosts form polymeric supramolecular crystals through multiple noncovalent interactions, including host–guest interaction, π–π stacking interaction, and metal–host coordination. In the aqueous solution, the butyl chain of BV+ was selectively encapsulated into the hosts Cy2Q[6] and TMeQ[6], while the bipyridinium group resides outside of the host portals, forming [2]pseudorotaxane. The ITC experiment indicates that the host–guest binding processes are exclusively enthalpy driven.
![Graphical abstract: Multiple noncovalent interaction constructed polymeric supramolecular crystals: recognition of butyl viologen by para-dicyclohexanocucurbit[6]uril and α,α′,δ,δ′-tetramethylcucurbit[6]uril](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C7QO00708F&imageInfo.ImageIdentifier.Year=2017)
Please wait while we load your content...
