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Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Interconversion between Möbius chiroptical states sustained by hexaphyrin dynamic coordination.

Bernard Boitrel1, Stéphane Le Gac

  • 1Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, Rennes F-35000, France. stephane.legac@univ-rennes1.fr.

Chemical Communications (Cambridge, England)
|March 11, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed switchable chiral molecular Möbius rings using zinc(II) hexaphyrin complexes. These Möbius aromatic complexes exhibit tunable chiroptical properties, enabling applications in molecular switches and sensors.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Molecular Möbius rings offer unique chiroptical properties but face synthetic challenges.
  • Controlling chirality in complex molecular architectures is crucial for advanced materials.

Purpose of the Study:

  • To investigate the chiroptical switching behavior of Möbius aromatic zinc(II) hexaphyrin complexes.
  • To explore the use of amino ligands for stimuli-responsive chirality control.

Main Methods:

  • Synthesis of Möbius aromatic zinc(II) hexaphyrin complexes.
  • Stimuli-responsive binding and release of amino ligands.
  • Spectroscopic analysis of chiroptical properties (e.g., circular dichroism).

Main Results:

  • Achieved interconversion between two chiral states via amino ligand binding/release.
  • Observed distinct chiroptical switching phenomena: amplification, on-off, and inversion.
  • Demonstrated the dual role of the amine ligand in chirality induction and regulation.

Conclusions:

  • The Möbius [28]hexaphyrin scaffold serves as an effective platform for chiral switches.
  • Ligand-controlled chiroptical switching offers new avenues for molecular device design.
  • This work advances the fundamental understanding and synthetic control of complex chiral systems.