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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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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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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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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 Resolution using Supramolecular-Templated Mesostructured Materials.

Yanan Huang1, Xavier Vidal2, Alfonso E Garcia-Bennett1,3

  • 1Department Molecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia.

Angewandte Chemie (International Ed. in English)
|May 23, 2019
PubMed
Summary
This summary is machine-generated.

Non-functionalized mesoporous silica particles achieve chiral resolution for enantiomeric pairs. Templated materials with guanosine monophosphate (NGM-1) and folic acid (NFM-1) enable direct chiral transcription, enhancing chiral separation potential.

Keywords:
chiralitymesoporous materialsself-assemblyseparationsupramolecular chemistry

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Chiral separation is crucial in pharmaceuticals and chemical synthesis.
  • Developing efficient and non-functionalized chiral stationary phases remains a challenge.
  • Mesoporous silica offers a versatile platform for chromatographic applications.

Purpose of the Study:

  • To demonstrate chiral resolution using non-functionalized mesoporous silica particles.
  • To investigate the use of supramolecular templating for creating chiral surfaces.
  • To evaluate the chiral selectivity and kinetics of the developed materials.

Main Methods:

  • Synthesis of supramolecular templated silica materials (NGM-1 and NFM-1) using guanosine monophosphate and folic acid.
  • Chiral transcription onto mesoporous silica surfaces via solvent extraction and calcination.
  • Measurement of chiral selectivity and kinetics using circular dichroism (CD) spectroscopy.

Main Results:

  • Successful chiral resolution of various enantiomeric pairs using non-functionalized mesoporous particles.
  • NGM-1 and NFM-1 materials exhibit opposite enantiomeric selectivity.
  • Demonstrated direct chiral transcription onto mesoporous silica surfaces.

Conclusions:

  • Supramolecular templated mesoporous silica provides an effective route for non-functionalized chiral resolution.
  • The developed materials show significant potential for advanced chiral separation technologies.
  • These findings open new avenues for enantiomeric catalysis and chiral separations.