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Related Concept Videos

Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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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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The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three...
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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 in Nature02:30

Chirality in Nature

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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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Related Experiment Video

Updated: Mar 1, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Silver Films with Hierarchical Chirality.

Liguo Ma1, Yuanyuan Cao1, Yingying Duan1,2

  • 1School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P.R. China.

Angewandte Chemie (International Ed. in English)
|May 26, 2017
PubMed
Summary
This summary is machine-generated.

Chemically synthesized chiral silver films exhibit hierarchical structures, enabling UV/Vis optical activities and chiral selectivity in catalysis. This novel fabrication method overcomes limitations of traditional methods for chiral metallic films.

Keywords:
hierarchical chiralitymetal filmsoptical activityplasmonic absorptionsilver

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Traditional fabrication of chiral metallic films often yields limited chirality and optical responses at longer wavelengths.
  • Achieving nanoscale chirality is crucial for advanced optical and catalytic applications.

Purpose of the Study:

  • To develop a novel method for fabricating chiral silver films with hierarchical structures.
  • To investigate the optical and catalytic properties of these chiral silver films.

Main Methods:

  • Chiral molecule-induced chemical synthesis of silver films on a copper substrate via redox reaction.
  • Characterization of hierarchical chirality at multiple scales (nanoflakes, nanoplates, circinates).
  • Analysis of optical properties (absorption, scattering) and catalytic electrochemical activity.

Main Results:

  • Identified three levels of chirality: twisted nanoflakes, helical nanoplates, and circinate structures.
  • Demonstrated multiple plasmonic optical activities in the UV/Vis range due to hierarchical chirality.
  • Observed chiral selectivity for amino acids in catalytic electrochemical reactions, linked to atomic lattice chirality.

Conclusions:

  • The chemically synthesized chiral silver films possess unique hierarchical structures.
  • These films exhibit broadband optical activity and selective catalytic capabilities.
  • The findings offer a new pathway for designing advanced chiral nanomaterials.