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Related Concept Videos

π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

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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.
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Chirality in Nature02:30

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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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Updated: Apr 21, 2026

Spatial Separation of Molecular Conformers and Clusters
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Temperature-Enhanced Coercive Field by Chiral Molecules.

Yael Kapon1, Lilach Brann1, Shira Yochelis1

  • 1Department of Applied Physics, The Hebrew University, Jerusalem 9190401, Israel.

The Journal of Physical Chemistry Letters
|April 20, 2026
PubMed
Summary
This summary is machine-generated.

The chiral-induced spin selectivity (CISS) effect

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Area of Science:

  • Condensed matter physics
  • Chemical physics
  • Materials science

Background:

  • Chiral-induced spin selectivity (CISS) links electron spin and molecular chirality.
  • CISS affects magnetic materials but its temperature dependence is unknown.

Purpose of the Study:

  • Investigate temperature dependence of CISS-induced magnetic coercivity.
  • Examine ribose-aminooxazoline (RAO) crystals on ferromagnetic surfaces.

Main Methods:

  • Studied temperature effects on magnetic coercivity of RAO crystals on ferromagnetic surfaces.
  • RAO is a stable, prebiotic chiral organic molecule.

Main Results:

  • Observed a significant increase in magnetic coercivity with rising temperature.
  • Magnetic coercivity increased by ~1 mT over a 60 °C change.
  • Contrary to classical expectations, coercivity strengthened at higher temperatures.

Conclusions:

  • Results suggest a vibronic contribution to CISS from electron-phonon interactions.
  • Spin-dependent chiral-magnetic surface interactions can strengthen at higher temperatures.
  • Provides insight into CISS origins and robustness of spin-controlled processes.