Visible-light responsive hydrogel based on methoxy azobenzene amphiphilic small molecule

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2024-07-15 DOI:10.1016/j.jphotochem.2024.115893

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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.

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基于甲氧基偶氮苯两性小分子的可见光响应水凝胶

我们设计并合成了一种新型光响应偶氮苯基两亲小分子（mAzoNa），其偶氮苯单元的正交位置上有四个甲氧基。mAzoNa 分子可以自组装成水凝胶，这主要是由疏水效应和取代偶氮苯基团之间的 π-π 堆积相互作用驱动的。形成的水凝胶由宽度为 150 至 500 纳米的长（∼数微米）片状带状结构组成。更有趣的是，该水凝胶在 550 纳米绿光照射下可发生凝胶到溶胶的可逆转变，在 450 纳米蓝光照射下可发生溶胶到凝胶的转变。这可能是由于被取代的四个甲氧基使 mAzoNa 的异构化波长发生了红移。这种独特的可见光响应行为将使制备的水凝胶在生物医学系统和智能材料中找到更多潜在的应用，而完全不需要使用紫外线。

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

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.