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Related Concept Videos

Prochirality02:05

Prochirality

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...
Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
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...
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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...
Chirality02:25

Chirality

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...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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...
Chirality in Nature02:30

Chirality in Nature

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. The...

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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
09:17

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

Three-dimensional chiral plasmonic oligomers.

Mario Hentschel1, Martin Schäferling, Thomas Weiss

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany. m.hentschel@physik.uni-stuttgart.de

Nano Letters
|March 31, 2012
PubMed
Summary
This summary is machine-generated.

Chiral plasmonic meta-atoms exhibit optical responses only when arranged in a handed, 3D fashion. These structures act as chiral rulers, encoding 3D arrangement in spectra for applications like single-molecule sensing.

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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
09:17

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Chemistry

Background:

  • Chirality, or handedness, is fundamental to biological systems.
  • Plasmonic nanostructures have recently demonstrated significant chiral optical responses.

Purpose of the Study:

  • To investigate the conditions required for three-dimensional plasmonic structures to exhibit chiral optical responses.
  • To explore the potential of these structures as chiral rulers for encoding spatial information.

Main Methods:

  • Fabrication of three-dimensional arrangements of plasmonic "meta-atoms".
  • Optical characterization to measure chiral optical responses.
  • Analysis of spectral modulation related to structural arrangement.

Main Results:

  • Chiral optical response in 3D plasmonic structures necessitates a handed arrangement of meta-atoms.
  • Resonant plasmonic coupling is a key requirement for inducing chirality.
  • The spectral signatures uniquely encode the 3D arrangement, functioning as a chiral plasmon ruler.

Conclusions:

  • Handed 3D arrangements of plasmonic meta-atoms are essential for observable chiral optical effects.
  • These engineered chiral plasmonic systems can serve as sensitive probes for molecular chirality.
  • The findings are vital for advancing chiral plasmonic devices for applications such as enantiomer sensing.