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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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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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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.
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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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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.
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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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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Spin-Photon Coupling in Organic Chiral Crystals.

Mingsheng Gao1, Zhongxuan Wang1, Xiao Zhang1

  • 1School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China.

Nano Letters
|November 7, 2019
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Organic chiral materials exhibit chirality-generated orbital angular momentum (CGO), influencing spin states and suppressing spin relaxation. This property is tunable with magnetic fields for magneto-optic coupling applications.

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Area of Science:

  • Materials Science
  • Quantum Optics
  • Organic Electronics

Background:

  • Organic chiral materials are gaining interest for spin-optics and optoelectronics.
  • Chirality-generated orbital angular momentum (CGO) is a key property distinguishing chiral from achiral materials.

Purpose of the Study:

  • To investigate the impact of CGO on magneto-optic coupling in organic nanocrystals.
  • To explore the tunability of spin states and spin-photon coupling via magnetic fields.

Main Methods:

  • Fabrication of organic nanocrystals with inherent chirality.
  • Experimental study of CGO effects on spin-orbital coupling.
  • Application of external magnetic fields to tune spin states.

Main Results:

  • CGO was found to influence spin states through spin-orbital coupling.
  • Spin relaxation time was suppressed to tens of picoseconds due to CGO.
  • Spin-photon coupling effects demonstrated a dependence on external magnetic field strength.

Conclusions:

  • Organic chiral nanocrystals offer a platform for controlling spin dynamics.
  • The CGO plays a crucial role in magneto-optic coupling and spin relaxation.
  • Tunable spin-photon interactions in chiral materials have potential for advanced optoelectronic devices.