2014
DOI: 10.1002/anie.201410184
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Photoliquefiable Ionic Crystals: A Phase Crossover Approach for Photon Energy Storage Materials with Functional Multiplicity

Abstract: Ionic crystals (ICs) of the azobenzene derivatives show photoinduced IC-ionic liquid (IL) phase transition (photoliquefaction) upon UV-irradiation, and the resulting cis-azobenzene ILs are reversibly photocrystallized by illumination with visible light. The photoliquefaction of ICs is accompanied by a significant increase in ionic conductivity at ambient temperature. The photoliquefaction also brings the azobenzene ICs further significance as photon energy storage materials. The cis-IL shows thermally induced … Show more

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Cited by 168 publications
(157 citation statements)
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“…Similar phenomena have been reported by several groups in azobenzene derivatives [14][15][16][17] and a spiropyran [18]. In an application point of view, this phase transition is of importance because this kind of phase transition material can be potentially be used in reusable light adhesives (dismantlable adhesives), photoresists, and other functional materials.…”
Section: Introductionsupporting
confidence: 81%
“…Similar phenomena have been reported by several groups in azobenzene derivatives [14][15][16][17] and a spiropyran [18]. In an application point of view, this phase transition is of importance because this kind of phase transition material can be potentially be used in reusable light adhesives (dismantlable adhesives), photoresists, and other functional materials.…”
Section: Introductionsupporting
confidence: 81%
“…6,7 In this regard, ILs containing π-conjugated chromophores are attractive as photofunctional soft materials that show new applications such as condensed luminescent materials 810 and solar thermal storage. 11 We have recently reported the photoliquefaction of ionic crystals to ILs by employing cationic azobenzene derivatives covalently modified with three flexible diethylene glycol chains in the ammonium head group. 11 Photon energy was effectively stored not only as the conformational energy of the azobenzene unit but also as the latent heat of crystallization, where the integration of self-assembly phenomena and photoresponsive ILs opened the doors to the phase crossover chemistry.…”
mentioning
confidence: 99%
“…11 We have recently reported the photoliquefaction of ionic crystals to ILs by employing cationic azobenzene derivatives covalently modified with three flexible diethylene glycol chains in the ammonium head group. 11 Photon energy was effectively stored not only as the conformational energy of the azobenzene unit but also as the latent heat of crystallization, where the integration of self-assembly phenomena and photoresponsive ILs opened the doors to the phase crossover chemistry. 11 Here, we describe a new photoresponsive IL that shows photoinduced crystallization phenomena.…”
mentioning
confidence: 99%
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“…15 The simultaneous pursuit of these two different gelation mechanisms is achieved by the present coordination polymer (C 16 OC 3 Trz) 3 CoCl 2 all by itself. The reentrant organogels by unblended supramolecular systems have been unprecedented, and it will provide a molecular design principle for developing a new family of phase-crossover soft materials 27 with reentrant physical properties and functions.…”
mentioning
confidence: 99%