Related Experiment Video
Updated: Jul 5, 2025
10:35
Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
8.7K
Full-Color Circularly Polarized Luminescence of Supramolecular Polymers with Handedness Inversion Regulated by Anion
1School of Chemical Science and Engineering, Advanced Research Institute, Tongji University, Shanghai 200092, P. R. China.
ACS Nano
|January 11, 2024
Summary
Researchers developed new full-color circularly polarized luminescence (CPL) materials using supramolecular polymers. These materials exhibit switchable handedness, a significant advancement for advanced optical applications.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Optoelectronics
Background:
- Developing solid-state full-color circularly polarized luminescence (CPL) materials with switchable handedness is challenging.
- Supramolecular polymer films from homochiral monomers present unique opportunities and difficulties.
Purpose of the Study:
- To realize full-color CPL materials with switchable handedness using supramolecular polymers.
- To investigate anion-directed chirality inversion in coassembled systems.
- To construct CPL polymeric materials with tunable color and inverted handedness.
Main Methods:
- Coassembly of a homochiral cholesterol derivative (PVPCC), zinc ions (Zn2+), and achiral fluorescent dyes.
- Anion exchange (NO3-, ClO4-, BF4-, Cl-) to induce chirality inversion.
- Temperature variation (298 K and 273 K) to tune CPL color and handedness.
- Doping coassembled complexes into poly(methyl methacrylate) (PMMA) films.
Main Results:
- Successfully achieved full-color CPL and inverted handedness in coassembled systems.
- Demonstrated anion-directed supramolecular chirality inversion, transforming nanorods to nanofibers.
- Showcased tunable CPL color and handedness inversion via temperature control.
- Developed PMMA films with enhanced CPL performance and maintained switchable handedness.
Conclusions:
- The study provides a novel strategy for constructing full-color CPL materials with switchable handedness from homochiral building blocks.
- The findings deepen the understanding of chirality inversion mechanisms in supramolecular chemistry.
- This work paves the way for advanced applications in materials science and optoelectronics.
Related Concept Videos
01:26Polymer Classification: Stereospecificity
2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
01:23Photoluminescence: Fluorescence and Phosphorescence
2.1K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
2.1K
01:14Photoluminescence: Applications
402
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
402
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
01:26Variables Affecting Phosphorescence and Fluorescence
504
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...
504