Photoresponsive arylazopyrazole surfactant/PDADMAC mixtures: reversible control of bulk and interfacial properties

Hardt, Michael; Honnigfort, Christian; Carrascosa-Tejedor, Javier; Braun, Marius G.; Winnall, Samuel; Glikman, Dana; Gutfreund, Philipp; Campbell, Richard A.; Braunschweig, Björn

doi:10.1039/d3nr05414d

Cited by 2 publications

(1 citation statement)

References 41 publications

(96 reference statements)

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“…[12,13] To tackle this, arylazopyrazoles (AAPs) have emerged as promising alternatives, where one of the phenyl rings of azobenzene is replaced by a pyrazole, which improves several aspects of their performance including quantitative photoswitching between isomers and significantly enhanced thermal stability of the Z isomer. [13][14][15] This has led to recent reports of the integration of AAPs into surfactants to form systems with phototuneable interfacial [16][17][18] and selfassembly properties. [19,20] However, further understanding of factors which affect isomerisation of these new surfactants, and the effect this has on their self-assembled structures, is still needed to tailor them towards application.…”

Section: Introductionmentioning

confidence: 99%

Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies

Jones,

Blayo,

Greenfield

et al. 2024

Preprint

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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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Section: Introductionmentioning

confidence: 99%

Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies

Jones,

Blayo,

Greenfield

et al. 2024

Preprint

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show abstract

Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies

Jones,

Blayo,

Greenfield

et al. 2024

Beilstein J. Org. Chem.

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Photoresponsive arylazopyrazole surfactant/PDADMAC mixtures: reversible control of bulk and interfacial properties

Abstract: In many applications of polyelectrolyte/surfactant (P/S) mixtures, it is difficult to fine-tune them after mixing the components without changing the sample composition, e.g. pH or the ionic strength. Here we...

Cited by 2 publications

References 41 publications

Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies

Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies

Understanding X-ray-induced isomerisation in photoswitchable surfactant assemblies

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