Multistimuli-Responsive and Photocontrolled Supramolecular Luminescent Gels Constructed by Anthracene-Bridged Bis(dibenzo-24-crown-8) with Secondary Ammonium Salt Polymer

Abstract

A novel multistimuli-responsive and photcontrolled supramolecular luminescent gel is fabricated from anthracenebridged bis(dibenzo-24-crown-8) (1) and secondary ammonium salt-functionalized graft polymer (3). X-ray crystallographic analysis reveals that the dibenzo-24-crown-8 (DB24C8) ring is located at the opposite site of 1, which will greatly hinder the mutual intermolecular π−π stacking between anthracene groups. By taking advantage of the controllable binding of 1 with 3, the unique gel−sol transition could occur under different temperatures, pH, and competitive guest bindings. Benefiting from the photo-oxygenation of anthracene, the luminescence behavior of the supramolecular gel could be switched off and on under UV light (365 nm) and heating treatment, which provides a new approach for constructing photocontrolled supramolecular luminescent gel.

Influence of Monomers’ Structure on the Assembly and Material Property of Pillar[5]arene‐Based Supramolecular Polymer Gels

“…[ 14‐15 ] On the other hand, the inherent dynamic, reversible, and adaptive properties of non‐covalent bond interactions endow SPGs with excellent properties. [ 16‐17 ] Meanwhile, due to their specific structures and function, SPGs have attracted much attention in many fields, such as ions detection, [ 18 ] optical materials, [ 19‐20 ] adsorption and separation, [ 21 ] fluorescence sensors, [ 22‐23 ] cell imaging, [ 24 ] etc . As we all know, the structure of monomer plays an important role in the assembly and properties of supramolecular polymer materials.…”

Fluorescent Supramolecular Polymers Formed by Crown Ether-Based Host-Guest Interaction

“…Based on the above results, this fluorescent supramolecular polymer provided a representative illustration of a fluorescent material to serve as a ratiometric sensor, whereby monitoring was possible through self-calibration from two emission peaks. Fu et al (2019) also prepared polystyrene 31 containing DBAS units as pendant groups. In addition, they synthesized an anthracene-bridged divalent crown ether 30 ( Figure 9A) in which anthracene adopted the cis-conformation to prevent π-π stacking between the anthracene units.…”

“…Fu et al ( 2019 ) also prepared polystyrene 31 containing DBAS units as pendant groups. In addition, they synthesized an anthracene-bridged divalent crown ether 30 ( Figure 9A ) in which anthracene adopted the cis -conformation to prevent π-π stacking between the anthracene units.…”

“…(D) Cartoon representations of the reversible gel-sol transition and the reversible light-controlled fluorescence emission behavior. Adapted with permission from Fu et al ( 2019 ); copyright 2019, American Chemical Society.…”

Construction of Supramolecular Polymers with Different Topologies by Orthogonal Self-Assembly of Cryptand–Paraquat Recognition and Metal Coordination

“…Although supramolecular polymers with different chain topologies, for example, linear [35][36][37][38][39], cross-linked [40][41][42][43], star-type [44][45][46], and branched [47][48][49][50], have been extensively studied, it is still a significant challenge to design supramolecular polymers with controllable topologies, which might further change their physical properties, such as molecular weight, polydispersity, and viscosity. Thus far, many supramolecular polymers based on crown ethers have been prepared [51][52][53].…”