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02:24Properties of Enantiomers and Optical Activity
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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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01:17Thermal Electrocyclic Reactions: Stereochemistry
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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.
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01:26Polymer Classification: Stereospecificity
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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...
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02:30Chirality in Nature
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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01:26Photochemical Electrocyclic Reactions: Stereochemistry
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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
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02:25Chirality
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Inverting the Circularly Polarized Luminescence Handedness of Chiral Supramolecular Polymers Using Temperature.
Teodor-Aurelian Cucuiet1, Andreas Vargas Jentzsch1, Flavio Picini1
1SAMS Research Group, Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22, Strasbourg, France.
Angewandte Chemie (International Ed. in English)
|September 17, 2025
Summary
Researchers explored supramolecular polymerization and chiroptical properties of triarylamine trisamide (TATA) monomers with tetraphenylethene (TPE) units. Cooling rates controlled distinct chiral self-assemblies, demonstrating TATA and TPE roles in luminescence.
Area of Science:
- Supramolecular chemistry
- Organic materials science
- Chiroptical spectroscopy
Background:
- Triarylamine trisamide (TATA) monomers are investigated for their self-assembly behavior.
- Tetraphenylethene (TPE) units are known for aggregation-induced emission (AIE).
- Controlling supramolecular chirality is crucial for advanced optical materials.
Purpose of the Study:
- To synthesize and characterize enantiopure TATA monomers with TPE units.
- To investigate the influence of cooling rates on self-assembly and chiroptical properties.
- To understand the combined roles of TATA and TPE in forming chiral supramolecular structures.
Main Methods:
- Synthesis of monosubstituted and trisubstituted TATA monomers.
- Controlled self-assembly via fast and slow cooling of chlorobenzene solutions.
- Characterization of self-assemblies using fluorescence spectroscopy and chiroptical measurements.
Main Results:
- Two distinct fluorescent self-assemblies with opposite supramolecular chiralities were obtained for each monomer.
- Cooling rate significantly influenced the handedness of the self-assembled structures.
- Strong circularly polarized luminescence (CPL) was observed from the TATA core, with cooling-rate-dependent handedness.
Conclusions:
- Both TATA and TPE units are critical for the observed self-assembly and chiroptical properties.
- The study demonstrates a method to control supramolecular chirality and CPL through cooling rates.
- This work offers insights into designing functional materials with tunable chiroptical responses.