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Related Concept Videos

Chirality02:25

Chirality

29.7K
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 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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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.0K
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...
7.0K

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A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

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Optical Chiral Induced Spin Selectivity XMCD Study.

Oren Ben Dor1, Shira Yochelis1, Hendrik Ohldag2

  • 1Applied Physics Department and the Center for Nano-Science and Nano-Technology The Hebrew University of Jerusalem Jerusalem 9190401 Israel.

Chimia
|June 27, 2018
PubMed
Summary
This summary is machine-generated.

Chiral induced spin selectivity (CISS) optically magnetizes ferromagnetic films. X-ray magnetic chiral dichroism (XMCD) spectroscopy confirms spin torque transfer from chiral molecules, showing polarization-dependent magnetization.

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Area of Science:

  • Spintronics
  • Molecular electronics
  • Chiral magnetism

Background:

  • Chiral induced spin selectivity (CISS) enables selective electron spin transport through chiral molecules.
  • This effect has been harnessed to magnetize ferromagnetic (FM) materials using adsorbed chiral molecules.
  • Optical or electrical methods can drive electron transfer for magnetization.

Purpose of the Study:

  • To investigate optically induced magnetization in thin FM films using XMCD spectroscopy.
  • To probe the spin torque transfer (STT) mechanism in a hybrid system of quantum dots (QDs) and chiral molecule self-assembled monolayers (SAMs).

Main Methods:

  • Utilizing X-ray magnetic chiral dichroism (XMCD) spectroscopy.
  • Employing a hybrid system of QDs and chiral molecule SAMs.
  • Applying circularly polarized light to induce magnetization.

Main Results:

  • XMCD spectroscopy confirmed optical induction of magnetization in FM films.
  • Observed differences in FM magnetization correlated with the circular polarization of light.
  • Results align with previous non-local Hall probe measurements.

Conclusions:

  • Optically induced magnetization via CISS is a viable method for magnetizing FM films.
  • XMCD is effective for probing spin-torque transfer in chiral molecular systems.
  • The study validates the CISS effect's role in optical magnetization through chiral molecules.