Light-regulated morphology control in supramolecular polymers

Mukherjee, Anurag; Ghosh, Goutam

doi:10.1039/d3nr04989b

“…Several comprehensive reviews have highlighted stimuli-responsive supramolecular polymers, categorized by either the different types of noncovalent driving forces or the varied external stimuli. , Additionally, certain reviews have discussed stimuli-triggered property changes triggered by specific light stimulus. ,, Herein, we focus on summarizing the different types of dynamic transformations within the supramolecular polymer field, which have yet to be summarized in previous reviews. Specifically, stimuli-responsive dynamic transformations in supramolecular polymers are classified into the following five categories (Figure ): (i) stimuli-triggered depolymerization of existing supramolecular polymers into monomers (Section ); (ii) stimuli-triggered transformations within different types of supramolecular polymers (Section ); (iii) stimuli-induced poststabilization of supramolecular polymers as a special case of Section (Section ); (iv) stimuli-triggered activation of a “dormant” monomer toward in situ supramolecular polymerization (Section ); (v) stimuli-induced transient supramolecular polymerization with programmable lifetimes (Section ).…”

Section: Introductionmentioning

confidence: 99%

Stimuli-Triggered Dynamic Transformations in Supramolecular Polymers

Xue,

Jin,

Zhang

et al. 2024

Chem. Mater.

4

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Oberflächenspannungsmanipulation mit sichtbarem Licht durch sensibilisierte Disäquilibrierung von photoschaltbaren Amphiphilen

Gemen,

Stövesand,

Glorius

et al. 2024

Angewandte Chemie

0

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Azoarene isomerization lies at the heart of numerous applications from catalysis or energy storage to photopharmacology. While efficient switching between their E and Z isomers predominantly relies on UV light, a recent study by Klajn and co‐workers introduced visible light sensitization of E azoarenes and subsequent isomerization as a tool coined disequilibration by sensitization under confinement (DESC) to obtain high yields of the Z isomer. This host‐guest approach is, however, still constrained to minimally substituted azoarenes with limited applicability in advanced molecular systems. Herein, we expand DESC for the assembly of surfactants at the air‐water interface. Leveraging our expertise with photoswitchable amphiphiles, we induce substantial alterations of water’s surface tension through reversible arylazopyrazole isomerization. After studying the binding of charged surfactants to the host, we find that the surface activity differences upon visible light irradiation for both isomers are comparable to those obtained by UV light excitation. The method is demonstrated on a large concentration range and can be activated using green or red light, depending on the sensitizer chosen. The straightforward implementation of photoswitch sensitization in a complex molecular network showcases how DESC enables the improvement of existing systems and the development of novel applications driven by visible light.

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Surface Tension Manipulation with Visible Light through Sensitized Disequilibration of Photoswitchable Amphiphiles

Gemen,

Stövesand,

Glorius

et al. 2024

Angew Chem Int Ed

0

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Azoarene isomerization lies at the heart of numerous applications from catalysis or energy storage to photopharmacology. While efficient switching between their E and Z isomers predominantly relies on UV light, a recent study by Klajn and co‐workers introduced visible light sensitization of E azoarenes and subsequent isomerization as a tool coined disequilibration by sensitization under confinement (DESC) to obtain high yields of the Z isomer. This host‐guest approach is, however, still constrained to minimally substituted azoarenes with limited applicability in advanced molecular systems. Herein, we expand DESC for the assembly of surfactants at the air‐water interface. Leveraging our expertise with photoswitchable amphiphiles, we induce substantial alterations of water’s surface tension through reversible arylazopyrazole isomerization. After studying the binding of charged surfactants to the host, we find that the surface activity differences upon visible light irradiation for both isomers are comparable to those obtained by UV light excitation. The method is demonstrated on a large concentration range and can be activated using green or red light, depending on the sensitizer chosen. The straightforward implementation of photoswitch sensitization in a complex molecular network showcases how DESC enables the improvement of existing systems and the development of novel applications driven by visible light.

show abstract

Light-regulated morphology control in supramolecular polymers

Abstract: Stimuli responsive materials have gained significant recent interest owing to their versatility and wide applications in fields ranging from material science to biology. In majority of the examples, external stimuli,...

Cited by 7 publications

References 114 publications

Stimuli-Triggered Dynamic Transformations in Supramolecular Polymers

Stimuli-Triggered Dynamic Transformations in Supramolecular Polymers

Oberflächenspannungsmanipulation mit sichtbarem Licht durch sensibilisierte Disäquilibrierung von photoschaltbaren Amphiphilen

Surface Tension Manipulation with Visible Light through Sensitized Disequilibration of Photoswitchable Amphiphiles

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