{"title":"Visible-light responsive hydrogel based on methoxy azobenzene amphiphilic small molecule","authors":"","doi":"10.1016/j.jphotochem.2024.115893","DOIUrl":null,"url":null,"abstract":"<div><p>A novel photo-responsive azobenzene-based amphiphilic small molecule (mAzoNa) with four methoxy groups located at ortho positions on azobenzene unit has been designed and synthesized. The mAzoNa molecules could self-assemble into hydrogel, which was driven mainly by hydrophobic effect and π–π stacking interaction between substituted azobenzene groups. The formed hydrogel was composed of long (∼several micrometers) lamellar ribbon structures with widths of 150 to 500 nm. The hydrogel also showed good self-supporting ability with a storage modulus (G′) higher than 10<sup>4</sup> Pa. It was more interesting that the hydrogel could undergo reversible gel-to-sol transition under 550 nm green light irradiation and the sol-to-gel transition under 450 nm blue light irradiation. This could be attributed to that the substituted four methoxy groups red-shifted the isomerization wavelengths of mAzoNa. This unique visible-light responsive behavior should make the prepared hydrogel find more potential applications in biomedical systems and smart materials without using ultraviolet light at all.</p></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Photochemistry and Photobiology A-chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1010603024004374","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
A novel photo-responsive azobenzene-based amphiphilic small molecule (mAzoNa) with four methoxy groups located at ortho positions on azobenzene unit has been designed and synthesized. The mAzoNa molecules could self-assemble into hydrogel, which was driven mainly by hydrophobic effect and π–π stacking interaction between substituted azobenzene groups. The formed hydrogel was composed of long (∼several micrometers) lamellar ribbon structures with widths of 150 to 500 nm. The hydrogel also showed good self-supporting ability with a storage modulus (G′) higher than 104 Pa. It was more interesting that the hydrogel could undergo reversible gel-to-sol transition under 550 nm green light irradiation and the sol-to-gel transition under 450 nm blue light irradiation. This could be attributed to that the substituted four methoxy groups red-shifted the isomerization wavelengths of mAzoNa. This unique visible-light responsive behavior should make the prepared hydrogel find more potential applications in biomedical systems and smart materials without using ultraviolet light at all.
期刊介绍:
JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds.
All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor).
The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.