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Related Concept Videos

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.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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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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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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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...
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¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

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Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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Enantiospecificity in NMR enabled by chirality-induced spin selectivity.

T Georgiou1, J L Palma2, V Mujica3

  • 1Molecular Biology Interdepartmental Program (MBIDP), The Molecular Biology Institute, University of California Los Angeles, 611 Charles E. Young Drive East, Los Angeles, CA, 90095-1570, USA.

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Chiral molecules exhibit spin polarization, influencing nuclear magnetic resonance (NMR) responses. This study theoretically explains how enantiomer-specific J-couplings arise from spin-orbit coupling, enabling NMR for chiral discrimination.

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Area of Science:

  • Molecular Magnetism
  • Chemical Physics
  • Spectroscopy

Background:

  • Spin polarization in chiral molecules is a magnetic response linked to electron transport and enantioselective bond polarization.
  • External magnetic fields are not required for this phenomenon.
  • Previous studies observed enantiospecific NMR responses, hinting at novel spin interactions.

Purpose of the Study:

  • To theoretically investigate the origin of enantiospecific NMR responses in chiral molecules.
  • To establish a connection between nuclear spin dynamics and molecular chirality.
  • To explore NMR as a tool for chiral discrimination.

Main Methods:

  • Development of an effective spin-Hamiltonian for helical molecules.
  • Application of Density Functional Theory (DFT) calculations.
  • Analysis of solid-state cross-polarization (CP) NMR experiments.

Main Results:

  • A theoretical framework explaining spin-orbit coupling-induced J-couplings in chiral molecules was presented.
  • DFT calculations confirmed that J-couplings depend on the specific enantiomer.
  • The findings support the idea of spin-orbit coupling contributing to indirect nuclear spin-spin coupling.

Conclusions:

  • Nuclear spin dynamics are intrinsically linked to molecular chirality.
  • NMR spectroscopy can be utilized for chiral discrimination without external agents.
  • The findings offer potential applications in molecular sensing and quantum information sciences.