Photochromism in Ionic Liquids. Theory and Applications

Pina, Fernando; Branco, Luís C.

doi:10.5772/14761

Cited by 3 publications

(2 citation statements)

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“…26 Many researchers have previously reported photochromism in ionic liquids. 27 As shown in Figure 4, the diarylethene/[bmim]NTf 2 mixture exhibited uniform and reversible color switching from almost colorless to pink upon UV and visible light irradiation. This suggested that diarylethene was dissolved in [bmim]NTf 2 and thereby showed effective photochromism.…”

Section: Resultsmentioning

confidence: 96%

“…Specifically, 1,2-bis[2-methylbenzo[b]thiophen-3-yl]-3,3,4,4,5,5-hexafluoro-1-cyclopentene exhibits reversible pink-red coloration/decoloration by UV/visible light-induced switching of its molecular structure 26. Many researchers have previously reported photochromism in ionic liquids 27. As shown inFigure 4, the diarylethene/[bmim]NTf2 mixture exhibited uniform and reversible color switching from almost colorless to pink upon UV and visible light irradiation.…”

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confidence: 99%

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Ionic Liquid Mediated Dispersion and Support of Functional Molecules on Cellulose Fibers for Stimuli-Responsive Chromic Paper Devices

Koga

Nogi

Isogai

2017

ACS Appl. Mater. Interfaces

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Functional molecules play a significant role in the development of high-performance composite materials. Functional molecules should be well dispersed (ideally dissolved) and supported within an easy-to-handle substrate to take full advantage of their functionality and ensure easy handling. However, simultaneously achieving the dissolution and support of functional molecules remains a challenge. Herein, we propose the combination of a nonvolatile ionic liquid and an easy-to-handle cellulose paper substrate for achieving this goal. First, the photochromic molecule, i.e., diarylethene, was dissolved in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([bmim]NTf). Then, diarylethene/[bmim]NTf was supported on cellulose fibers within the paper, through hydrogen bonding between [bmim] cations of the ionic liquid and the abundant hydroxyl groups of cellulose. The as-prepared paper composites exhibited reversible, rapid, uniform, and vivid coloration and bleaching upon ultraviolet and visible light irradiation. The photochromic performance was superior to that of the paper prepared in the absence of [bmim]NTf. This concept could be applied to other functional molecules. For example, lithium perchlorate/[bmim] tetrafluoroborate supported within cellulose paper acted as a flexible electrolyte to provide a paper-based electrochromic device. These findings are expected to further the development of composite materials with high functionality and practicality.

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Section: Resultsmentioning

confidence: 96%

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confidence: 99%