Photochromism in sound-induced alignment of a diarylethene supramolecular nanofibre

Hotta, Yasuhisa; Fukushima, Satomi; Motoyanagi, Jin; Tsuda, Akihiko

doi:10.1039/c4cc09702e

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…Changes in aggregation induced by closure of a DTE system were also identified by Hotta et al 343 The open isomer of a DTEcontaining bis(urea) was found to be soluble in chloroform but form fibrous H-aggregates upon gradual dilution with hexane. The suspended assemblies undergo over 90% conversion to the closed form when treated with UV light, producing a purple solution of needle-like nanofibres with a 60% enlargement in mean hydrodynamic radius.…”

Section: Electrocyclic Reactionsmentioning

confidence: 55%

“…Velocity gradients generated by 120 Hz sound at an amplitude of 13.5 Pa were found by Hotta et al to orient nanofibres of a DTE-containing bis(urea) in n-hexane, but the resulting linear dichroism (LD) signal spans UV and visible frequencies only if the closed DTE isomer is used. 343 More strikingly, the azobenzene derivative 43 produces a strong sound-induced LD signal in cyclohexane solutions of its trans form but becomes LD silent when isomerised, due to fragmentation of the fibrous aggregates into non-orientable spheroidal particles (Fig. 46).…”

Section: Gels Under Stressmentioning

confidence: 99%

“…Pappas et al demonstrated that short, curved nanofibres of the tripeptides D FFD and D FFI can be converted to bundles of parallel nanofibres through directional sonication, resulting in strong gels with pronounced supramolecular chirality. 434 342 More strikingly, the azobenzene derivative 43 produces a strong sound-induced LD signal in cyclohexane solutions of its trans form but becomes LD silent when isomerised, due to fragmentation of the fibrous aggregates into non-orientable spheroidal particles (Fig. 46).…”

Section: Gels Under Stressmentioning

confidence: 99%

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Gels with sense: supramolecular materials that respond to heat, light and sound

2016

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. (2016) 'Gels with sense : supramolecular materials that respond to heat, light and sound.', Chemical society reviews., 45 (23). pp. 6546-6596. Further information on publisher's website:https://doi.org/10.1039/C6CS00435KPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Advances in the field of supramolecular chemistry have made it possible, in many situations, to reliably engineer soft materials to address a specific technological problem. Particularly exciting are "smart" gels that undergo reversible physical changes on exposure to remote, non-invasive environmental stimuli. This review explores the development of gels which are transformed by heat, light and ultrasound, as well as other mechanical inputs, applied voltages and magnetic fields. Focusing on small-molecule gelators, but with reference to organic polymers and metal-organic systems, we examine how the structures of gelator assemblies influence the physical and chemical mechanisms leading to thermo-, photo-and mechano-switchable behaviour. In addition, we evaluate how the unique and versatile properties of smart materials may be exploited in a wide range of applications, including catalysis, crystal growth, ion sensing, drug delivery, data storage and biomaterial replacement.

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Section: Electrocyclic Reactionsmentioning

confidence: 55%

Section: Gels Under Stressmentioning

confidence: 99%

Section: Gels Under Stressmentioning

confidence: 99%

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Gels with sense: supramolecular materials that respond to heat, light and sound

2016

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“…[22][23][24][25] In this study, we designed an azobenzene-containing tetrapyrrolic macrocycle with an expectation that trans-cis photoisomerization of the azobenzene component would bring about significant changes of its conformation (Scheme 1). [26,27] However, it is known that attachment of the azobenzene components to the chromophoric molecules reduces its transcis conversion and quantum yield in the photoisomerization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photoisomerization of an azobenzene-containing tetrapyrrolic macrocycle

Yamamoto

Nakamura

Liu

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

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“…Recent studies demonstrated clear evidence on sound-induced liquid vibrations that can lead to the formation of chemically (pH or redox) different spatiotemporal domains in solutions. This approach was later used to specifically align nanofibers in solution utilizing fluid flows generated by audible sound vibrations [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Pilot Aquaphotomic Study of the Effects of Audible Sound on Water Molecular Structure

et al. 2022

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Sound affects the medium it propagates through and studies on biological systems have shown various properties arising from this phenomenon. As a compressible media and a “collective mirror”, water is influenced by all internal and external influences, changing its molecular structure accordingly. The water molecular structure and its changes can be observed as a whole by measuring its electromagnetic (EMG) spectrum. Using near-infrared spectroscopy and aquaphotomics, this pilot study aimed to better describe and understand the sound-water interaction. Results on purified and mineral waters reported similar effects from the applied 432 Hz and 440 Hz frequency sound, where significant reduction in spectral variations and increased stability in water were shown after the sound perturbation. In general, the sound rearranged the initial water molecular conformations, changing the samples’ properties by increasing strongly bound, ice-like water and decreasing small water clusters and solvation shells. Even though there was only 8 Hz difference in applied sound frequencies, the change of absorbance at water absorbance bands was specific for each frequency and also water-type-dependent. This also means that sound could be effectively used as a perturbation tool together with spectroscopy to identify the type of bio, or aqueous, samples being tested, as well as to identify and even change water functionality.

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Photochromism in sound-induced alignment of a diarylethene supramolecular nanofibre

Abstract: A photochromic supramolecular nanofibre, composed of a diarylethene derivative, exhibits hydrodynamic alignment upon exposure to the audible sound. The aligned nanofibre outputs linear dichroism (LD), whose wavelength region can be switched reversibly with UV and visible light.

Cited by 12 publications

References 35 publications

Gels with sense: supramolecular materials that respond to heat, light and sound

Gels with sense: supramolecular materials that respond to heat, light and sound

Synthesis and photoisomerization of an azobenzene-containing tetrapyrrolic macrocycle

Pilot Aquaphotomic Study of the Effects of Audible Sound on Water Molecular Structure

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