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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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,...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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...
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...

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Updated: Jun 24, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Optical second harmonic generation chiral spectroscopy.

Stijn Foerier1, Irina A Kolmychek, Oleg A Aktsipetrov

  • 1Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|March 14, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a new chiral spectroscopy technique using helicenbisquinone thin films. This method analyzes nonlinear optical properties, marking a significant advancement in experimental spectroscopy.

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Area of Science:

  • Nonlinear optics
  • Spectroscopy
  • Materials science

Background:

  • Chiral spectroscopy is crucial for analyzing molecular asymmetry.
  • Second harmonic generation (SHG) is a sensitive nonlinear optical technique.
  • Helicenbisquinone thin films offer unique optical properties.

Purpose of the Study:

  • To develop and validate a novel chiral spectroscopic technique.
  • To investigate the nonlinear optical susceptibility of helicenbisquinone thin films.
  • To establish a unified theoretical framework for SHG chiral spectroscopy.

Main Methods:

  • Obtaining SHG chiral spectroscopy intensities.
  • Measuring the dispersion of nonlinear optical susceptibility components.
  • Utilizing helicenbisquinone thin films as the sample material.

Main Results:

  • A single formalism successfully fitted all experimental data.
  • The dispersion of nonlinear optical susceptibility was characterized.
  • Intensities of SHG chiral spectroscopy were accurately obtained.

Conclusions:

  • The study presents a significant milestone in developing advanced experimental techniques.
  • The findings support the potential of SHG chiral spectroscopy for molecular analysis.
  • The developed formalism provides a robust method for interpreting spectroscopic data.