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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Spin–Spin Coupling: One-Bond Coupling

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,...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

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

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

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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...

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Updated: Jun 27, 2026

Optical Control of Living Cells Electrical Activity by Conjugated Polymers
10:16

Optical Control of Living Cells Electrical Activity by Conjugated Polymers

Published on: January 28, 2016

Optically-controlled spin valves in conjugated polymers.

Sheng Li1, Thomas F George, Xiao-Ling He

  • 1Department of Physics, Zhejiang Normal University, Zhejiang 310004, China. shenglee@zjnu.cn

The Journal of Physical Chemistry. B
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces two novel optically-controlled spin transfer effects in pi-conjugated polymers. These effects enable ultrafast manipulation of spin carriers for advanced organic spintronic devices.

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Area of Science:

  • Organic spintronics
  • Materials science
  • Quantum information

Background:

  • Pi-conjugated polymers offer unique electronic and optical properties.
  • Controlling spin carriers in organic materials is crucial for next-generation electronics.
  • Ultrafast optical control of spin dynamics remains a significant challenge.

Purpose of the Study:

  • To propose novel optically-controlled spin transfer effects in pi-conjugated polymers.
  • To design generic optically-controlled ultrafast response organic spin valves.
  • To explore the manipulation of spin and spinless carriers via photoexcitation and electric fields.

Main Methods:

  • Theoretical proposal of two-photon excitation mechanisms.
  • Analysis of spin carrier charge reversal and directional movement under electric fields.
  • Investigation of spinless carrier photoexcitation leading to entangled spin carriers.
  • Modeling the coupling of generated spin carriers with ferromagnetic materials to influence magnetoresistance.

Main Results:

  • Demonstrated optical control over spin carrier charge and direction.
  • Showcased photoexcitation-induced entanglement of spinless carriers into spin carriers.
  • Established that coupling with ferromagnets alters magnetoresistance.
  • Confirmed the ultrafast nature of these spin dynamics.

Conclusions:

  • Two distinct optically-controlled spin transfer effects are proposed for pi-conjugated polymers.
  • These effects facilitate the design of ultrafast organic spin valves.
  • The findings pave the way for novel organic spintronic and quantum information applications.