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Related Concept Videos

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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 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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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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CD Spectroscopy to Study DNA-Protein Interactions
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Natural Circular Dichroism beyond Chirality.

Elen Duverger-Nédellec1, Alessandro De Frenza2, Patrick Rosa1

  • 1Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.

Journal of the American Chemical Society
|June 23, 2025
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Summary
This summary is machine-generated.

Researchers used X-rays to observe natural circular dichroism in achiral crystals, overcoming UV-vis measurement limitations. This finding confirms symmetry predictions and reveals insights into crystal structure determination.

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Area of Science:

  • Solid-state physics
  • Crystallography
  • Spectroscopy

Background:

  • Natural optical activity in crystals is predicted by symmetry but difficult to measure in UV-vis ranges due to birefringence.
  • Achiral point groups theoretically allow for optical activity, but experimental verification is challenging.

Purpose of the Study:

  • To experimentally demonstrate natural circular dichroism in specific achiral crystal systems.
  • To investigate the influence of crystal symmetry on optical activity using X-ray spectroscopy.
  • To explore the relationship between crystal point groups, space groups, and observed optical phenomena.

Main Methods:

  • Utilized X-ray spectroscopy to probe copper and iron coordination salts.
  • Focused measurements at the K-edges of copper and iron.
  • Analyzed experimental data against symmetry predictions for achiral point groups (4̅2m and 4̅).

Main Results:

  • Successfully observed natural circular dichroism in copper and iron coordination salts crystallizing in achiral point groups.
  • Experimental angular dependence of circular dichroism matched theoretical predictions based on point group symmetry.
  • An angular phase shift was observed for the 4̅ point group, attributed to space group translation operations.

Conclusions:

  • X-ray spectroscopy provides a viable method for measuring natural circular dichroism in achiral crystals, overcoming UV-vis limitations.
  • The study validates symmetry-based predictions for optical activity in specific achiral crystal structures.
  • Space group symmetry, specifically translation operations, plays a crucial role in defining crystalline axes, impacting observed optical properties.