scholarly journals Mechanistic connotations of restriction of intramolecular motions (RIM)

2020 ◽  
Author(s):  
Yujie Tu ◽  
Zheng Zhao ◽  
Jacky W Y Lam ◽  
Ben Zhong Tang
Keyword(s):  
Mechanistic Models ◽  
Aggregation Induced Emission ◽  
Intramolecular Motion ◽  
Intramolecular Motions

Restriction of intramolecular motion (RIM) is the widely-accpeted mechanism of aggregation-induced emission (AIE). In this concise and comprehensive perspective, four mechanistic models related to different nonradiative pathways are summarized with examples to disclose the connotation of RIM, and meaningful mechanistic topics for future researches are advised.

scholarly journals Solid-state intramolecular motions in continuous fibers driven by ambient humidity for fluorescent sensors

2020 ◽  
Author(s):  
Yunmeng Jiang ◽  
Yanhua Cheng ◽  
Shunjie Liu ◽  
Haoke Zhang ◽  
Xiaoyan Zheng ◽  
...  
Keyword(s):  
Solid State ◽  
Hierarchical Structures ◽  
Molecular Rotors ◽  
Fiber Sensors ◽  
Light Emitting ◽  
Optical Signals ◽  
Ambient Humidity ◽  
Response Characteristics ◽  
Intramolecular Motion ◽  
Intramolecular Motions

Abstract One striking feature of molecular rotors is their ability to change conformation with detectable optical signals through molecular motion when stimulated. However, due to the strong intermolecular interactions, synthetic molecular rotors have often relied on fluid environments. Here, we take advantage of the solid-state intramolecular motion of aggregation-induced emission (AIE) molecular rotors and one-dimensional fibers, developing highly sensitive optical fiber sensors that respond to ambient humidity rapidly and reversibly with observable chromatic fluorescence change. Moisture environments induce the swelling of the polymer fibers, activating intramolecular motions of AIE molecules to result in red-shifted fluorescence and linear response to ambient humidity. In this case, polymer fiber provides a process-friendly architecture and a physically tunable medium for the embedded AIE molecules to manipulate their fluorescence response characteristics. Assembly of sensor fibers could be built into hierarchical structures, which are adaptive to diverse-configuration for spatial-temporal humidity mapping, and suitable for device integration to build light-emitting sensors as well as touchless positioning interfaces for intelligence systems.

The novel isoindigo compound with aggregation-induced emission: Br–Br bonding joint restriction of intramolecular motion and for cell imaging property

Soft Matter ◽  
2021 ◽  
Author(s):  
Zhenyu Zhang ◽  
Yu Sun ◽  
Xu Zhao ◽  
Gaolei Xi ◽  
Xuedong Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Cell Imaging ◽  
Heavy Atom ◽  
The Novel ◽  
Aggregation Induced Emission ◽  
Heavy Atom Effect ◽  
Joint Restriction ◽  
Intramolecular Motion ◽  
Imaging Property ◽  
Atom Effect

6, 6’ Dibromided tert-butyloxycarbonyl Isoindigo (Br-TBOCII) possess intense fluorescence for solid state under excitation with Aggregation-Induced Emission (AIE) property, contrary to the classic heavy-atom effect. The unique AIE mechanism is...

scholarly journals Aggregation-induced emission enhancement in boron difluoride complexes of 3-cyanoformazanates

2016 ◽  
Vol 4 (27) ◽  
pp. 6478-6482 ◽  
Author(s):  
Ryan R. Maar ◽  
Joe B. Gilroy
Keyword(s):  
Aggregation Induced Emission ◽  
Π Stacking ◽  
Emission Enhancement ◽  
Intramolecular Motion ◽  
Boron Difluoride

Boron difluoride (BF2) complexes of 3-cyanoformazanates exhibit aggregation-induced emission enhancement in THF–water mixtures due to their severely twisted N-aryl substituents which restrict intramolecular motion and π stacking upon aggregation.

Rigidity-induced emission enhancement of network polymers crosslinked by tetraphenylethene derivatives

2015 ◽  
Vol 3 (33) ◽  
pp. 8504-8509 ◽  
Author(s):  
Kenta Kokado ◽  
Ryosuke Taniguchi ◽  
Kazuki Sada
Keyword(s):  
Aggregation Induced Emission ◽  
Network Polymers ◽  
Emission Enhancement ◽  
Intramolecular Motions

Network polymers crosslinked by molecules with aggregation-induced emission (AIE) properties exhibited rigidity-induced emission enhancement derived from restriction of intramolecular motions.

scholarly journals Aggregation-Induced Emission and Biological Application of Tetraphenylethene Luminogens

2011 ◽  
Vol 64 (9) ◽  
pp. 1203 ◽  
Author(s):  
Yuning Hong ◽  
Jacky Wing Yip Lam ◽  
Sijie Chen ◽  
Ben Zhong Tang
Keyword(s):  
Condensed Phase ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Green Light ◽  
Living Cells ◽  
Maximum Luminance ◽  
Biological Application ◽  
Aggregation Induced Emission ◽  
Cell Staining ◽  
Intramolecular Motion

Tetraphenylethene derivatives [Ph(PhCH=CHPhR)C=C(PhCH=CHPhR)Ph, R=H, CN, NO2, NPh2] with green, yellow-green, and orange emission colours were designed and synthesized. These molecules are practically non-emissive in their dilute solutions but emit intensely as nanoaggregates in poor solvents, demonstrating a novel phenomenon of aggregation-induced emission. Their blended films with poly(methyl methacrylate) also display bright emissions. Restriction of intramolecular motion in the condensed phase may be responsible for such unusual behaviour. Multilayer electroluminescence devices with a configuration of indium tin oxide/N,N′-di(1-naphthyl)-N,N′-diphenylbenzidine/emitter/tris(8-hydroxyquinolinolato)aluminum (Alq3)/LiF/Al were constructed, which gave green light with a maximum luminance and current efficiency of 12930 cd cm–2 and 3.04 cd A–1 respectively. The tetraphenylethenes can serve as excellent cell staining agents for selectively illuminating the cytoplasm and vesicles of living cells.

A novel tetraphenylethylene derivative: 4-methyl-N-[3-(1,2,2-triphenylethenyl)phenyl]benzenesulfonamide with aggregation-induced emission

2019 ◽  
Vol 75 (8) ◽  
pp. 1060-1064
Author(s):  
Lei Jia ◽  
Jun Zhang ◽  
Lin Du
Keyword(s):  
Three Dimensional ◽  
Intermolecular Forces ◽  
Monoclinic Space Group ◽  
The Novel ◽  
X Ray Diffraction ◽  
Aggregation State ◽  
Aggregation Induced Emission ◽  
H Nmr ◽  
Dimensional Network ◽  
Intramolecular Motions

The novel tetraphenylethylene derivative 4-methyl-N-[3-(1,2,2-triphenylethenyl)phenyl]benzenesulfonamide (abbreviated as MTBF), C33H27NO2S, was synthesized successfully and characterized by single-crystal X-ray diffraction, high-resolution mass spectroscopy and 1H NMR spectroscopy. MTBF crystallizes in the centrosymmetric monoclinic space group P21/c. In the crystal structure, the MTBF molecules are connected into a one-dimensional band and then a two-dimensional sheet by hydrogen bonds of the N—H...O and C—H...O types. The sheets are further linked to produce a three-dimensional network via C—H...π interactions. The molecules aggregate via these intermolecular forces, which restrain the intramolecular motions (RIM) and decrease the energy loss in the aggregation state, so as to open the radiative channels, and thus MTBF exhibits excellent fluorescence by aggregation-induced emission (AIE) enhancement.

scholarly journals Aggregation-Induced Emission of Tetraphenylethene-Conjugated Phenanthrene Derivatives and Their Bio-Imaging Applications

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 728 ◽  
Author(s):  
Duy Khuong Mai ◽  
Joomin Lee ◽  
Ilgi Min ◽  
Temmy Vales ◽  
Kyong-Hoon Choi ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Imaging Agents ◽  
Active Compounds ◽  
Intracellular Imaging ◽  
Aggregation Induced Emission ◽  
Bio Imaging ◽  
Intramolecular Motions

In this study, a series of rationally designed emissive phenanthrene derivatives were synthesized and their aggregation-induced emission (AIE) properties in tetrahydrofuran (THF)/water mixtures were investigated. Two tetraphenylethene (TPE) segments were conjugated to both ends of the phenanthrene core at the para-positions and meta-positions, resulting in pTPEP and mTPEP derivatives, respectively. While the TPE-conjugated phenanthrene derivatives did not show any emission when dissolved in pure THF, they showed strong sky-blue emissions in water-THF mixtures, which is attributed to the restriction of intramolecular motions of TPE segments by aggregation. Furthermore, silica nanoparticles loaded with these AIE-active compounds were prepared and proved to be promising intracellular imaging agents.

Restriction of Intramolecular Motions: The General Mechanism behind Aggregation-Induced Emission

2014 ◽  
Vol 20 (47) ◽  
pp. 15349-15353 ◽  
Author(s):  
Nelson L. C. Leung ◽  
Ni Xie ◽  
Wangzhang Yuan ◽  
Yang Liu ◽  
Qunyan Wu ◽  
...  
Keyword(s):  
General Mechanism ◽  
Aggregation Induced Emission ◽  
Intramolecular Motions
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