了解 X 射线诱导的可光开关表面活性剂组装中的异构化。

IF 2.2 4区 化学 Q2 CHEMISTRY, ORGANIC
Beilstein Journal of Organic Chemistry Pub Date : 2024-08-14 eCollection Date: 2024-01-01 DOI:10.3762/bjoc.20.176
Beatrice E Jones, Camille Blayo, Jake L Greenfield, Matthew J Fuchter, Nathan Cowieson, Rachel C Evans
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引用次数: 0

摘要

光表面活性剂(PS)可自组装成有序的纳米结构,如胶束或液晶,从而制造出动态响应材料。这些光表面活性剂含有光开关基团,如偶氮苯(Azo)或最近的芳基偶氮吡唑(AAPs),它们在 E 态和 Z 态之间发生光异构化时会改变形状和极性,从而改变自组装结构。小角 X 射线散射(SAXS)是探测聚苯乙烯形态的一种强大技术,可通过原位光照射和快速、时间分辨数据收集来测量结构变化的机理。然而,以前的研究表明,X 射线辐照会诱导偶氮-聚苯乙烯发生 Z 到 E 的异构化,从而导致测量的光静止态不准确。在此,我们利用 SAXS 和原位光照射,研究了光和 X 射线照射对由两种不同的 PS(含有偶氮或 AAP 光开关)形成的胶束的影响。X 射线辐照对 Z 异构体的影响取决于光开关、溶剂、浓度和形态。我们借此为未来使用光开关分子进行 X 射线实验制定了指导原则,这有助于更准确地了解这些材料在太阳能储存、催化或可控药物输送方面的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies.

Dynamic, responsive materials can be built using photosurfactants (PS) that self-assemble into ordered nanostructures, such as micelles or liquid crystals. These PS contain photoswitchable groups, such as azobenzene (Azo) or, more recently, arylazopyrazoles (AAPs), which change shape and polarity on photoisomerisation between the E and Z states, thus changing the self-assembled structure. Small-angle X-ray scattering (SAXS) is a powerful technique to probe the morphology of PS and can be used to measure the mechanisms of structural changes using in-situ light irradiation with rapid, time-resolved data collection. However, X-ray irradiation has been shown previously to induce Z-to-E isomerisation of Azo-PS, which can lead to inaccuracies in the measured photostationary state. Here, we investigate the effect of light and X-ray irradiation on micelles formed from two different PS, containing either an Azo or AAP photoswitch using SAXS with in-situ light irradiation. The effect of X-ray irradiation on the Z isomer is shown to depend on the photoswitch, solvent, concentration and morphology. We use this to create guidelines for future X-ray experiments using photoswitchable molecules, which can aid more accurate understanding of these materials for application in solar energy storage, catalysis or controlled drug delivery.

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来源期刊
CiteScore
4.90
自引率
3.70%
发文量
167
审稿时长
1.4 months
期刊介绍: The Beilstein Journal of Organic Chemistry is an international, peer-reviewed, Open Access journal. It provides a unique platform for rapid publication without any charges (free for author and reader) – Platinum Open Access. The content is freely accessible 365 days a year to any user worldwide. Articles are available online immediately upon publication and are publicly archived in all major repositories. In addition, it provides a platform for publishing thematic issues (theme-based collections of articles) on topical issues in organic chemistry. The journal publishes high quality research and reviews in all areas of organic chemistry, including organic synthesis, organic reactions, natural product chemistry, structural investigations, supramolecular chemistry and chemical biology.
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