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Related Concept Videos

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...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
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...
1.4K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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,...
1.4K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.2K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
4.2K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.4K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Non-Monotonic Sequence Control Maximizes Spin Transport in Conjugated Polymers at Room-Temperature.

Ankang Guo1,2, Mingliang Zhu1,2, Han Zhao1,2

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|November 20, 2025
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Summary

Organic semiconductor design was optimized by controlling repeat-unit sequence for efficient spin transport. Intermediate sequence order balances chain flexibility and coherence, enhancing spin-based electronic device performance.

Keywords:
field‐effect transistorsorganic semiconductorssequence controlspin valvesspintronics

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Area of Science:

  • Organic electronics
  • Materials science
  • Condensed matter physics

Background:

  • Organic semiconductors offer long spin lifetimes for room-temperature spin transport.
  • Controlling structure-transport relationships is key for advanced electronic applications.
  • Spin transport in organic materials is less explored than charge transport.

Purpose of the Study:

  • Investigate the effect of repeat-unit sequence on spin transport in organic semiconductors.
  • Establish a non-monotonic design rule for optimizing spin transport efficiency.
  • Advance conjugated polymers for logic, memory, sensing, and wearable systems.

Main Methods:

  • Synthesis of regioregular copolymers with varying repeat-unit sequences.
  • Characterization of π-π packing, coherence, and charge carrier mobility.
  • Electron paramagnetic resonance and spin valve measurements to assess spin properties.

Main Results:

  • A non-monotonic dependence of spin transport on sequence order was identified.
  • Intermediate sequence order optimized π-π packing and spin transport efficiency.
  • A three-component regioregular copolymer achieved high mobility (0.43 cm² V⁻¹ s⁻¹) and on/off ratio (6 × 10⁶).
  • Spin valves demonstrated a >8% room-temperature magnetoresistance ratio, significantly exceeding bicomponent alternating species.

Conclusions:

  • Repeat-unit sequence critically influences spin transport in organic semiconductors.
  • A non-monotonic design strategy balancing coherence and flexibility enhances spin transport.
  • This approach enables the development of advanced conjugated polymers for spintronic applications.