Abstract
Fluorescent supramolecular polymers (FSP) have attracted considerable attention in recent years. Particularly, the incorporation of aggregation-induced emission (AIE) property to the FSP will bring this material into practical applications. Herein, we designed and synthesized a cyanostilbene motif derived ditopic benzo-21-crown-7 (B21C7) as a host molecule (H). The cyanostilbene motif endows H with AIE property while the B21C7 motif renders it with the capability to complex with electron deficient guest molecules. Upon the addition of a ditopic dialkylammonium salt molecule (G), a novel FSP with blue luminescent property can be constructed. This B21C7-based host-guest FSP with blue fluorescence may have potential application in supramolecular luminescent materials.
Highlights
Supramolecular polymers, in which ordered and highly directional polymeric arrays of monomeric building blocks are brought together by reversible non-covalent bonds, are outstanding materials that generally exhibit stimuli-responsive and self-healing properties (Aida et al, 2012; Yang et al, 2015; Wehner and Würthner, 2020)
In the presence of guest molecule G, a novel AA/BBtype Fluorescent supramolecular polymers (FSP) can be fabricated by crown ether-based host-guest complexation
Supramolecular polymers can be fabricated by such a host compound with a ditopic dialkylammonium salt guest
Summary
Supramolecular polymers, in which ordered and highly directional polymeric arrays of monomeric building blocks are brought together by reversible non-covalent bonds, are outstanding materials that generally exhibit stimuli-responsive and self-healing properties (Aida et al, 2012; Yang et al, 2015; Wehner and Würthner, 2020). Cyanostilbene is a wellknown fluorophore and shows interesting AIE behavior, which is usually used for the construction of rotaxanes (Lee et al, 2013), nanoparticles with near-infrared emission (Shi et al, 2016), hydrogen-bonded supramolecular polymer (Lavrenova et al, 2017), and light-harvesting system (Kim et al, 2018; Sun et al, 2020). In the presence of guest molecule G (a ditopic dialkylammonium salt compound), a novel AA/BBtype FSP can be fabricated by crown ether-based host-guest complexation. The FSP could be assembled into macroscopic fibers with blue fluorescence from concentrated solution This crown ether-based FSP with beautiful blue fluorescence both in solution and in the solid state may have potential application in supramolecular luminescent materials
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