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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 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.
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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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Biofuel-Driven Stepping Chiral Supramolecular Transfer Container.

Jie Yu1, Huijia Yu1, Yugui Qiu1

  • 1College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China.

Angewandte Chemie (International Ed. in English)
|November 8, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a recyclable chiral supramolecular container using a triphenylamine cage and nucleotides. This biofuel-driven system demonstrates efficient fluorescence and programmable chirality transfer for applications in logic gates and information encryption.

Keywords:
chiral anticounterfeitingchirality transfermolecular recognitionstimuli-responsivesupramolecular assembly

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Area of Science:

  • Supramolecular Chemistry
  • Chiral Materials Science
  • Biofuel Applications

Background:

  • Development of artificial receptors for molecular recognition.
  • Need for intelligent materials with tunable chiral properties.
  • Exploration of biofuel-driven systems for sustainable applications.

Purpose of the Study:

  • To design and synthesize a novel biofuel-driven chiral supramolecular transfer container.
  • To investigate its nucleotide encapsulation and fluorescence properties.
  • To explore its capabilities in chirality transfer, thermal responsiveness, and multistate luminescence.

Main Methods:

  • Synthesis of a hexacationic triphenylamine cage.
  • Nucleotide binding studies using fluorescence spectroscopy.
  • Chirality transfer activation via adenosine triphosphate.
  • Circularly polarized luminescence (CPL) and Cotton effect measurements.
  • Enzymatic catalysis (hexokinase, apyrase) for stepwise chirality regulation.

Main Results:

  • High binding constant (5.37×10^5 M^-1) for nucleotide encapsulation in water.
  • Significant guest-induced fluorescence enhancement (QY from 6.5% to 16.6%).
  • Achiral cage induced chirality transfer, yielding CPL at 575 nm (g_abs=+6.4×10^-4).
  • Reversible thermal responsiveness and stepwise chirality regulation via enzymatic catalysis.
  • Demonstrated recovery of adaptive chirality after refueling.

Conclusions:

  • The developed supramolecular container is a recyclable, biofuel-driven system.
  • It exhibits efficient nucleotide binding, fluorescence modulation, and programmable chirality transfer.
  • Potential applications in chiral logic gates and multilevel information encryption are highlighted.