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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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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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,...
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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...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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Summary
This summary is machine-generated.

This study reviews a novel Hall circuit design for electrodes, enabling the probing of spin-selective charge transfer. This innovation allows for a deeper understanding of spin and charge currents in electronic and electrochemical systems.

Keywords:
2D electron gaschiral moleculeselectron transfersemiconductors

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Area of Science:

  • Condensed Matter Physics
  • Electrochemistry
  • Materials Science

Background:

  • Spin-selective charge transfer is crucial for advanced electronic devices.
  • Existing methods for probing spin phenomena are limited.
  • Hall effect measurements offer a potential pathway for spin analysis.

Purpose of the Study:

  • To review a novel Hall circuit design for working electrodes.
  • To demonstrate its application in probing spin-selective charge transfer and displacement.
  • To explore new avenues in understanding spin and charge currents.

Main Methods:

  • Design of a Hall circuit using semiconductor heterostructures to form a 2D electron gas.
  • Integration of the Hall circuit into a working electrode.
  • Application of the device to study photoinduced charge exchange, molecular charge polarization, and cyclic voltammetry.

Main Results:

  • The Hall circuit successfully probes spin-selective charge transfer and displacement.
  • Three distinct spin-selective processes were studied: photoinduced charge exchange, voltage-induced molecular polarization, and spin-analyzed cyclic voltammetry.
  • The device generates a Hall voltage indicative of spin polarization in various scenarios.

Conclusions:

  • The reviewed Hall circuit design offers a versatile platform for investigating spin phenomena.
  • It enables the addition of a 'spin' dimension to electrochemical measurements.
  • This approach enhances the understanding of spin and charge currents in diverse materials and processes.