UV-Induced Chromatism of Polydiacetylenic Assemblies

Sun, Xuemei; Chen, Tao; Huang, Sanqing; Cai, Fangjing; Chen, Xuli; Yang, Zhibin; Li, Li; Cao, Helin; Lu, Yunfeng; Peng, Huisheng

doi:10.1021/jp910592y

Cited by 24 publications

(22 citation statements)

References 31 publications

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“…UV-induced chromatism has been reported to be powered by the [2+2] cycloaddition of cyano-stilbene derivatives [12] (on-off change) and the transto-cis transition of azobenzene (from blue to red). [13] To the best of our knowledge, the result we report is the first example of UV-induced chromatism that shows white-light PL emissions.Our previous studies [11d, e] have demonstrated that RhB molecules on silica nanoparticle surfaces could exhibit white-light emissions (under excitation at 365 nm), which is different from the yellow emission of the free RhB molecules in solutions. The change in the PL-emission colours has been attributed to the aggregation of RhB molecules in The chromatism of the UV-irradiated RhB solutions observed herein is similar to the PL behaviour of the RhBanchored silica nanoparticles.…”

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confidence: 69%

UV‐Induced Rhodamine B Aggregation into Nanoparticles Exhibiting Reversible Changes of Yellow‐ and White‐Light Photoluminescent Emissions

Hsu

Liu

2011

Chemistry A European J

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Fluorescent nanoparticles are emerging materials for many applications. Besides inorganic quantum dots, organic-inorganic hybrid fluorescent materials, made from incorporation of organic dyes to inorganic nanoparticles, are used in several studies.[1] On the other hand, organic fluorescent nanoparticles are also of interests based on the relatively wide variability and flexibility in molecular design and synthesis.[2] With the confinement effects, the organic fluorescent nanoparticles show optical properties that differ from the behaviours of the corresponding bulk materials.[3] Adhikari et al.[2] prepared carbazole-based fluorescent nanoparticles with a precipitation method. The particle sizes and emission behaviours of the fluorescent nanoparticles depended on the solvent compositions. The laser-ablation process developed by Asahis group has also been applied to preparation of organic fluorescent nanoparticles.[4] Other promising approaches for the preparation of organic fluorescent nanoparticles are uses of the aggregation-induced emission (enhancement) materials.[5] However, preparation of the aggregation-induced emission materials usually needs complicated synthetic routes. On the other hand, J-aggregation of cyanine dye molecules, which show attractive opto-A C H T U N G T R E N N U N G electronic properties, has received research attention.[6] The J-aggregates of cyanine dye molecules have been controlled by thermal/chemical treatment [7] and UV-light [8] illumination, which dissociated and restored the J-aggregates. The ability to control the chromic changes is useful for practical applications of optical memories. Hence, the stimuli-induced aggregation of fluorescent molecules could potentially be used for the preparation of organic fluorescent nanoparticles.Rhodamine dyes, which have good photo-stability and photo-physical properties, have been widely used in many fields.[9] Some of the Rhodamine dyes, including Rhodamine B (RhB), are commercially available and their fluorescent features have been well studied.[10] Herein, we report the UV-induced RhB aggregation into nanoparticles. Along with this aggregation, the photoluminescence (PL, under excitation at 365 nm) of RhB also changes, from a yellow (RhB molecules) to a white-light (RhB nanoparticles) emission. The formation of RhB nanoparticles and the changes in the PL emissions are reversible. To the best of our knowledge, this behaviour has never been reported for RhB or other fluorescent dyes. As a result, a novel approach to generate organic fluorescent nanoparticles and to prepare white-light-emitting fluorescent materials [11] has been demonstrated.A solution of RhB (0.025 wt %) in THF was prepared for the tests. The solution in a quartz cell was irradiated with UV radiation (365 nm, 8 W). The distance between the sample cell and the UV source was 5 cm. The time-dependent changes in the appearance, fluorescent emissions and fluorescent spectra of the RhB solution were recorded ( Figure 1). The original solution of RhB is pink red and shows a y...

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confidence: 69%

UV‐Induced Rhodamine B Aggregation into Nanoparticles Exhibiting Reversible Changes of Yellow‐ and White‐Light Photoluminescent Emissions

Hsu

Liu

2011

Chemistry A European J

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“…Inorganic materials and polymer materials such as tungsten oxide [54], liquid crystal molecules [55], polydiacetylene (PDA) [56][57][58], poly [1-phenyl-2-(p-trimethylsilyl) phenylacety-lene] (PTP), polyurethane (PU), polyaniline (PANI), polypyrrole (PPy) and polydimethylsiloxane (PDMS) can be combined with ACNT to obtain performance of change color in response to electricity.…”

Section: Electrochromismmentioning

confidence: 99%

Light and electrically responsive materials based on aligned carbon nanotubes

Luo

2016

European Polymer Journal

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“…2 Chromatic polydiacetylene/silica synthesized from diacetylene-bridged silsesquioxanes Polydiacetylene (PDA) has been extensively investigated as sensing materials due to the unique chromatic transition, typically from blue to red in response to environmental stimuli [46]. Various PDA materials such as vesicles, films, and nanocomposites have been fabricated, and their chromatic responses to a broad spectrum of external stimuli (temperature, pH, ion, solvent, stress, and ligand interactions) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of bridged silsesquioxanes incorporated with conjugated organic functionalities

Cai

Sun

et al. 2010

Front. Chem. China

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Self-assembly of bridged silsesquioxanes with a chemical structure of (RO) 3 Si-R′-Si (OR) 3 represents an efficient approach to design and to fabricate functional organic/ inorganic nanocomposites. The desired functionalities are mainly incorporated into the R' with R of a hydrolysable alkoxide group such as CH 3 or CH 3 CH 2 . This feature article discusses two typical assembly approaches: self-directed assembly aiming at ordered solid materials and surfactant-directed assembly aiming at periodic mesoporous organosilica, with emphasis on the bridged silsesquioxanes in which conjugated functional organic groups are incorporated. The conjugated moieties are shown to be critical to the resulting assembly structure, morphology, and property. Self-assembly of three bridged silsesquioxanes based on polydiacetylene, perylene, and porphyrin has been detailed, respectively.

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UV-Induced Chromatism of Polydiacetylenic Assemblies

Cited by 24 publications

References 31 publications

UV‐Induced Rhodamine B Aggregation into Nanoparticles Exhibiting Reversible Changes of Yellow‐ and White‐Light Photoluminescent Emissions

UV‐Induced Rhodamine B Aggregation into Nanoparticles Exhibiting Reversible Changes of Yellow‐ and White‐Light Photoluminescent Emissions

Light and electrically responsive materials based on aligned carbon nanotubes

Self-assembly of bridged silsesquioxanes incorporated with conjugated organic functionalities

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