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Related Concept Videos

Chirality02:25

Chirality

28.8K
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 at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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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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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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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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...
14.6K
Prochirality02:05

Prochirality

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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...
4.7K
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Related Experiment Video

Updated: Dec 23, 2025

Measurement of Chladni Mode Shapes with an Optical Lever Method
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Measurement of Chladni Mode Shapes with an Optical Lever Method

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Chiral Surface Lattice Resonances.

Eric S A Goerlitzer1, Reza Mohammadi1, Sergey Nechayev2,3

  • 1Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstraße 4, Erlangen, D-91058, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|April 23, 2020
PubMed
Summary
This summary is machine-generated.

Researchers explored chiral plasmonic crescents to create handedness-dependent surface lattice resonances. This discovery opens new avenues for optical sensing and information processing applications.

Keywords:
chiralitycolloidal lithographyoptical activityplasmonicssurface lattice resonances

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Area of Science:

  • Plasmonics and Nanophotonics
  • Chirality in Optics

Background:

  • Surface lattice resonances (SLRs) arise from collective excitation in periodic metallic nanoparticle arrays.
  • SLRs exhibit narrow line widths, offering potential in optical sensing and information processing.

Purpose of the Study:

  • To experimentally investigate a new degree of freedom in SLRs by exploring handedness-dependent excitation.
  • To demonstrate chiral lattice modes in arrays of chiral plasmonic crescents.

Main Methods:

  • Fabrication of large-area arrays of planar and 3D gold crescents using self-assembly and modified colloidal lithography.
  • Investigation of SLR excitation dependence on interparticle distance and array order.
  • Characterization of optical activity arising from chiral lattice modes.

Main Results:

  • Demonstrated successful fabrication of chiral plasmonic crescent arrays.
  • Observed handedness-dependent excitation of SLRs.
  • Confirmed the formation of chiral lattice modes exhibiting optical activity.

Conclusions:

  • Chirality in individual plasmonic nanoparticles can induce chiral lattice modes in their arrays.
  • This work introduces optical activity as a tunable parameter for SLRs.
  • Potential applications in advanced optical sensing, chiral metamaterials, and information processing.