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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.
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Chirality in Nature02:30

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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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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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A Micropatterning Assay for Measuring Cell Chirality
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Chiral macrocyclic terpyridine complexes.

Thomas Brandl1, Viktor Hoffmann1, Andrea Pannwitz1

  • 1Department of Chemistry , University of Basel , St. Johanns-Ring 19 , 4056 Basel , Switzerland .

Chemical Science
|May 22, 2018
PubMed
Summary
This summary is machine-generated.

Novel chiral iron(II) and ruthenium(II) bis(terpyridine) cage complexes were synthesized. These stable, axially chiral complexes exhibit minimal racemization at room temperature, showcasing their robust structural integrity.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Chiral Materials

Background:

  • Terpyridine ligands are crucial building blocks in coordination chemistry.
  • Designing rigid molecular architectures is key to controlling chirality and stability.
  • Metal complexes with bis(terpyridine) units offer unique structural and electronic properties.

Purpose of the Study:

  • To synthesize novel chiral metal(II) bis(terpyridine) cage complexes.
  • To investigate the stability and enantiomeric purity of these complexes.
  • To characterize the structural and spectroscopic properties of the synthesized compounds.

Main Methods:

  • Synthesis of iron(II) and ruthenium(II) bis(terpyridine) precursors.
  • Complexation reactions to form cage structures.
  • Characterization using NMR, UV-Vis, electrochemistry, mass spectrometry, circular dichroism, and X-ray crystallography.

Main Results:

  • Successful synthesis of chiral Fe(L1) and Ru(L1) bis(terpyridine) cage complexes.
  • Demonstrated preorganization of precursors for efficient cage formation.
  • Observed minimal racemization of isolated enantiomers at room temperature due to rigid spacers.
  • Comprehensive characterization confirmed the structure and properties of the stable, axially chiral complexes.

Conclusions:

  • The designed precursors enable the formation of stable, axially chiral bis(terpyridine) metal complexes.
  • The rigidity of the molecular framework ensures high enantiomeric stability in solution.
  • These chiral cage complexes represent valuable new materials for advanced applications.