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Related Concept Videos

Chirality02:25

Chirality

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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...
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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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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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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
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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Remote Control of Dynamic Twistacene Chirality.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Chiroptical Materials

Background:

  • Perylene diimide (PDI) derivatives are widely studied for their optoelectronic properties.
  • Controlling axial chirality in complex organic molecules is crucial for developing advanced functional materials.
  • Twistacenes, with their inherent helical structures, offer unique photophysical properties.

Purpose of the Study:

  • To establish a reliable method for manipulating dynamic axial chirality in PDI-based twistacenes.
  • To investigate the influence of chiral substituents on the imide position in inducing helicity.
  • To understand the role of substituents and solvent environment in controlling chiroptical properties.

Main Methods:

  • Synthesis of PDI-based twistacenes with chiral substituents.
  • UV-vis absorption and Circular Dichroism (CD) spectroscopy.
  • X-ray crystallography and Time-Dependent Density Functional Theory (TDDFT) calculations.

Main Results:

  • Chiral substituents on the imide position successfully induce and control helicity in PDI-based twistacenes.
  • Remote chirality effectively dictates the helical conformation of flexible [4]helicene subunits.
  • Both chiral substituents and solvent polarity significantly affect the sign and intensity of CD signals.
  • DFT calculations indicate steric interactions of chiral groups are key to inducing preferred helicity.

Conclusions:

  • A robust strategy for controlling dynamic axial chirality in PDI twistacenes has been demonstrated.
  • The findings provide insights into the structure-property relationships governing helicity induction in flexible chiral systems.
  • This work opens avenues for designing novel chiral optoelectronic materials with tunable properties.