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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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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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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Chiral molecules self-assemble into diverse structures using arene-perfluoroarene interactions. These structures dynamically change, offering new ways to control molecular and nano-architectures.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Controlling the folding and oligomerization of chiral compounds into specific molecular architectures with predictable chiroptical properties is challenging.
  • Arene-perfluoroarene (AP) interactions offer a non-covalent approach to direct self-assembly.

Purpose of the Study:

  • To investigate the use of AP interactions to control the folding and dimerization of chiral alanine derivatives.
  • To explore the dynamic transformations and chiroptical switching of self-assembled chiral architectures.

Main Methods:

  • Synthesis of alanine derivatives functionalized with pyrene and perfluoronaphthalene.
  • X-ray crystallography and nuclear magnetic resonance (NMR) spectroscopy to determine molecular structures.
  • Solvent manipulation and thermal cycling to induce reversible structural changes.

Main Results:

  • A rigid derivative self-assembled into double helical dimers via hydrogen bonding and AP forces in nonpolar solvents, reversibly dissociating in polar solvents or upon heating.
  • A flexible derivative formed chiral molecular clamps in nonpolar solvents, transitioning to planar dimers in polar solvents.
  • Dynamic structural transformations were linked to observable chiroptical switching.
  • Hierarchical control was demonstrated in self-assembled nanoarchitectures, including columnar and lamellar packing.

Conclusions:

  • Arene-perfluoroarene interactions provide a powerful tool for manipulating chiral molecular and supramolecular architectures.
  • Dynamic geometrical transformations and chiroptical switching can be achieved by altering solvent polarity or temperature.
  • This approach enriches methodologies for precise chiral synthetic chemistry and hierarchical material design.