Monomeric and aggregation emissions of tetraphenylethene in a photo-switchable polymer controlled by cyclization of diarylethene and solvent conditions

Singh, Ravinder; Wu, Hsin-Yen; Dwivedi, Atul Kumar; Singh, Ashutosh; Lin, Chien-Min; Raghunath, P.; Lin, Ming‐Chang; Wu, Tung‐Kung; Wei, Kung‐Hwa; Lin, Hong‐Cheu

doi:10.1039/c7tc03071a

Cited by 37 publications

(26 citation statements)

References 80 publications

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“…( Figure S8 ) At room temperature these two solvents are completely miscible but CB6O.Py is soluble only in THF, therefore as the water content increases, the formation of pyrene aggregates is expected. At first, the fluorescence intensity increases, and its maximum slightly blue‐shifts with growing water content, due to constraints in intramolecular movements arising from enhanced intermolecular interactions (aggregation enhanced emission) [53] . The fluorescence intensity reaches a maximum for the mixture with 65 % water; higher water concentration results in drastic emission quenching.…”

Section: Resultsmentioning

confidence: 99%

Twist‐Bend Nematic Glasses: The Synthesis and Characterisation of Pyrene‐based Nonsymmetric Dimers

et al. 2021

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A selection of pyrene‐based liquid crystal dimers have been prepared, containing either methylene‐ether or diether linked spacers of varying length and parity. All the diether linked materials, CBOnO.Py (n=5, 6, 11, 12), exhibit conventional nematic and smectic A phases, with the exception of CBO11O.Py which is exclusively nematic. The methylene‐ether linked dimer, CBnO.Py, with an even‐membered spacer (n=5) was solely nematogenic, but odd‐members (n=6, 8, 10) exhibited both nematic and twist‐bend nematic phases. Replacement of the cyanobiphenyl fragment by cyanoterphenyl giving CT6O.Py, gave elevated melting and nematic‐isotropic transition temperatures, and SmA and SmCA phases were observed on cooling the nematic phase. Intermolecular face‐to‐face associations of the pyrene moieties drive glass formation, and all these materials have a glass transition temperature at or above room temperature. The stability of the glassy twist‐bend nematic phase allowed for its study using AFM, and the helical pitch length, PTB, was measured as 6.3 and 6.7 nm for CB6O.Py and CB8O.Py, respectively. These values are comparable to the shortest pitch of a twist‐bend nematic phase measured to date.

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Section: Resultsmentioning

confidence: 99%

Twist‐Bend Nematic Glasses: The Synthesis and Characterisation of Pyrene‐based Nonsymmetric Dimers

et al. 2021

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“…Taking the DTE-containing photo-responsive polymers as an example, traditional photochromic DTE systems often suffer from the ACQ problem when using fluorescence as the read-out signal, which limits their practical applications in optical systems with high sensitivity and high precision [ 71 ]. In 2017, Lin et al integrated AIEgens into a DTE-based photochromic polymer system to solve the ACQ issue [ 72 ]. As shown in Fig.…”

Section: Responses To Physical Stimulimentioning

confidence: 99%

“…Inset: photo images of P-PHT at 0 min and 40 min UV irradiation. Reproduced from [ 72 ] with permission from the Royal Society of Chemistry. b Fluorescent photographs of DTE-BP-embedded PVDF film upon alternating 254-nm UV and visible light irradiations.…”

Section: Responses To Physical Stimulimentioning

confidence: 99%

Functional Polymer Systems with Aggregation-Induced Emission and Stimuli Responses

Han

Wang

et al. 2021

Top Curr Chem (Z)

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Functional polymer systems with stimuli responses have attracted great attention over the years due to their diverse range of applications. Such polymers are capable of altering their chemical and/or physical properties, such as chemical structures, chain conformation, solubility, shape, morphologies, and optical properties, in response to single or multiple stimuli. Among various stimuli-responsive polymers, those with aggregation-induced emission (AIE) properties possess the advantages of high sensitivity, fast response, large contrast, excellent photostability, and low background noise. The changes in fluorescence signal can be conveniently detected and monitored using portable instruments. The integration of AIE and stimuli responses into one polymer system provides a feasible and effective strategy for the development of smart polymers with high sensitivity to environmental variations. Here, we review the recent advances in the design, preparation, performance, and applications of functional synthetic polymer systems with AIE and stimuli responses. Various AIE-based polymer systems with responsiveness toward single physical or chemical stimuli as well as multiple stimuli are summarized with specific examples. The current challenges and perspectives on the future development of this research area will also be discussed at the end of this review.

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“…[58] In addition to the above-mentioned organic AIE-active molecules with photochromic properties, many gels, polymers, supramolecular systems, and metal complexes are also photoresponsive fluorescent materials with AIE characteristics. [59][60][61][62][63] Li et al synthesized a class of photo-responsive liquid crystal gelators, with AIE properties and gel-enhanced fluorescence, by linking TPE and cholesterol to a central Azo moiety with different alkyl spacer lengths. Based on the trans-cis photoisomerization of Azo, these compounds showed gel-sol transitions and a color change from yellow to orange after UV light irradiation.…”

Section: Grafting Aiegens Into Photochromicsmentioning

confidence: 99%

“…Lin and coworkers designed a photoswitchable polymer consisting of an AIEgen (TPE), photochromic DAE, and a triazole linker, which exhibited excellent AIE properties in its original form with ring-open DAE. [62] However, under UV irradiation, the AIE fluorescence attributed to TPE was quenched and monomeric emission appeared, as a result of the photoisomerization of DAE and energy transfer from TPE to the ring-closed DAE moiety. The introduction of photochromic groups and AIEgens into a supramolecular system is also a feasible strategy to construct photo-responsive AIE materials.…”

Section: Grafting Aiegens Into Photochromicsmentioning

confidence: 99%

Photo‐Responsive Fluorescent Materials with Aggregation‐Induced Emission Characteristics

Luo

Wang

2020

Advanced Optical Materials

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Stimuli‐responsive fluorescent materials with aggregation‐induced emission (AIE) characteristics have attracted increasing attention owing to their advantages of bright fluorescence in the solid state and the ability to tune the structures and physicochemical performances in response to various stimuli. Among all the available external stimuli, light stands out, and has rapidly become a focus of research, because it offers green and remote triggering, noninvasive manipulation, high spatiotemporal resolution, and convenient tunable properties. Consequently, photo‐responsive AIE materials provide a fascinating strategy for constructing functional fluorescent materials. This review summarizes the recent advances in the fabrication of photo‐responsive fluorescent materials with AIE characteristics by grafting AIE fluorogens (AIEgens) into photochromic molecules. State‐of‐the‐art photo‐responsive AIE materials based on the inherent photochemical reactions of AIEgens are highlighted, and are classified and discussed according to the photochemical pathways, including photocyclization, photo‐isomerization, photodimerization, photo‐removal, and multiple photoreactions. Following this, the corresponding applications of photo‐responsive AIE materials in bio‐imaging, anti‐counterfeiting, photo‐patterning, photo‐release of chemicals or drugs, and photo‐controlled assembly and disassembly are introduced. Finally, the most promising directions for development and applications of photo‐responsive AIE materials are outlined and discussed.

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Monomeric and aggregation emissions of tetraphenylethene in a photo-switchable polymer controlled by cyclization of diarylethene and solvent conditions

Abstract: AIE behaviour of TPE with open and closed forms of DAE in a photo-switchable polymer is studied in high water contents.

Cited by 37 publications

References 80 publications

Twist‐Bend Nematic Glasses: The Synthesis and Characterisation of Pyrene‐based Nonsymmetric Dimers

Twist‐Bend Nematic Glasses: The Synthesis and Characterisation of Pyrene‐based Nonsymmetric Dimers

Functional Polymer Systems with Aggregation-Induced Emission and Stimuli Responses

Photo‐Responsive Fluorescent Materials with Aggregation‐Induced Emission Characteristics

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