Cucurbit[7]uril-Mediated 2D Single-Layer Hybrid Frameworks Assembled by Tetraphenylethene and Polyoxometalate toward Modulation of α-Chymotrypsin Activity

ACS Applied Materials & Interfaces
Ni ChengYu Liu

Abstract

Construction of large scale single-layer 2D frameworks in water is significant as their superiorities in various fields. Utilizing macrocycle mediated supramolecular self-assembly represents a promising approach, however challenges still remain in practical preparation. Here we exploited a two-step supramolecular strategy to build 2D organic-inorganic hybrid frameworks at micrometre-scale in water. Taking advantage of the high binding affinity to cucurbit[7]uril (CB[7]), mono-quaternary ammonium tetraphenylethene derivatives (MQATPE) were firstly included with CB[7] to form 1:1 complex (MQATPE@CB[7]). Then just mixing the complex with anionic polyoxometalate Na9[EuW10O36]•32H2O (denoted as Eu-POM) at a 3:1 molar ratio leads to the formation of single-layer 2D films with tens of micrometers via electrostatic and π-π stacking interactions. The most unique feature of this strategy is that the steric effect imposed by CB[7] would not only lead the modules to adopt a periodic hexagonal assembly, but also forbid stacking between layers, through comparing with the merely multilayered 2D nanosheets self-assembled by MQATPE/ Eu-POM. Interestingly, the charge interactions between MQATPE and Eu-POM would lead to the aggregation-induced em...Continue Reading

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Citations

Apr 7, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Ming HanHong-Guo Liu
Oct 15, 2021·Chemical Communications : Chem Comm·Wei-Lei ZhouYu Liu

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