Related Experiment Video
Updated: Jun 30, 2025
10:33
An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
8.4K
Regulable high-contrast mechanofluorochromic enhancement behaviour based on substituent effects
Guang Yang1, Wen-Xuan Zhao1, Jing-Yi Cao1
1School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, P. R. China. csh210302@163.com.
Chemical Communications (Cambridge, England)
|March 19, 2024
Summary
Researchers developed mechanoresponsive luminogens that change light emission under pressure. These materials show significant, reversible changes, enabling potential use in advanced pressure sensors and organic light-emitting diodes (OLEDs).
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Mechanoresponsive luminogens are materials that alter their light emission properties upon mechanical stimulation.
- Developing materials with tunable and predictable mechanoresponsive behavior is crucial for advanced applications.
Purpose of the Study:
- To establish a facile strategy for synthesizing mechanoresponsive luminogens.
- To investigate the impact of structural modifications (substituents and positional effects) on optical and mechanoresponsive properties.
- To explore the potential of these materials in pressure sensing and organic light-emitting diodes (OLEDs).
Main Methods:
- Synthesis of novel mechanoresponsive luminogens.
- Characterization of optical properties, including fluorescence efficiency.
- Evaluation of mechano-responsive behavior under mechanical stress.
- Assessment of reversibility and emission enhancement factors.
Main Results:
- A facile strategy was developed to create mechanoresponsive luminogens.
- Distinct optical phenomena and mechano-responsive properties were observed even with slight structural differences.
- Significant mechanical-induced emission enhancement (5-100 times) was achieved.
- The materials demonstrated excellent reversibility.
Conclusions:
- The developed strategy allows for the creation of highly sensitive mechanoresponsive luminogens.
- Structural variations significantly influence luminescence and mechanical response.
- The observed properties suggest promising applications for pressure sensors and OLEDs.
Related Concept Videos
01:13Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
6.0K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
6.0K
01:26Variables Affecting Phosphorescence and Fluorescence
499
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
499
03:02Colors and Magnetism
11.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.7K
01:24ortho–para-Directing Deactivators: Halogens
5.6K
Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
5.6K
01:37Super-resolution Fluorescence Microscopy
7.0K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
7.0K
02:17Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
14.2K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
14.2K