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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.1K
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...
1.1K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

973
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...
973
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
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...
1.5K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.1K
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...
1.1K

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Spin in Organic Cocrystals.

Cheng Zhang1,2, Xin Wang2, Yang Li1

  • 1Jiangsu Key Laboratory of Micro and, Nano Heat Fluid Flow Technology and Energy Application Institution, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 13, 2023
PubMed
Summary
This summary is machine-generated.

Organic spintronics utilizes spin properties in organic cocrystals for efficient circuits. This review covers advancements in charge-transfer cocrystals, exploring spin phenomena and mechanisms for future applications.

Keywords:
organic cocrystalsradical cocrystalsspin propertiesspin transportspintronics

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Quantum Chemistry

Background:

  • Organic spintronics offers a pathway to highly efficient, low-power electronic circuits.
  • Spin manipulation in organic cocrystals is a key strategy for exploring novel chemicophysical properties.
  • Charge-transfer cocrystals are emerging materials with significant potential in spintronic applications.

Purpose of the Study:

  • To summarize recent advancements in spin properties within organic charge-transfer cocrystals.
  • To elucidate the underlying mechanisms governing these spin phenomena.
  • To discuss future directions and challenges in the field of organic spintronics.

Main Methods:

  • Literature review of recent research on spin properties in organic cocrystals.
  • Analysis of experimental and theoretical studies on spin phenomena.
  • Discussion of mechanisms including spin multiplicity, mechanoresponsive spin, chiral orbit, and spin-crossover.

Main Results:

  • Recent progress in understanding spin properties in binary and ternary organic cocrystals.
  • Exploration of spin phenomena in radical cocrystals and spin transport.
  • Identification of key mechanisms driving spin behavior in these materials.

Conclusions:

  • Organic charge-transfer cocrystals exhibit diverse and tunable spin properties.
  • Further research is needed to fully harness these properties for advanced applications.
  • A deeper understanding will guide the integration of spin functionalities into organic electronic devices.