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Related Concept Videos

Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
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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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Updated: May 22, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Molecular Kondo chain.

Andrew Dilullo1, Shih-Hsin Chang, Nadjib Baadji

  • 1Institute of Applied Physics, University of Hamburg, Germany.

Nano Letters
|May 9, 2012
PubMed
Summary
This summary is machine-generated.

Researchers created one-dimensional spin chains using molecular building blocks on a gold surface. They observed separate Kondo regions and confirmed antiferromagnetic coupling, advancing nanoscale molecule-based device development.

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Last Updated: May 22, 2026

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Area of Science:

  • Surface science
  • Molecular electronics
  • Quantum magnetism

Background:

  • Development of electronically coupled organic systems is crucial for nanoscale molecule-based devices.
  • Covalent linking of molecular building blocks offers a pathway to construct ordered molecular architectures.

Purpose of the Study:

  • To assemble one-dimensional (1D) spin chains by covalently linking molecular building blocks on a Au(111) surface.
  • To investigate the structural properties and electronic behavior of these 1D spin chains.
  • To probe the magnetic interactions between spin centers within the chains.

Main Methods:

  • Scanning tunneling microscopy (STM) for structural characterization.
  • Scanning tunneling spectroscopy (STS) for probing the Kondo effect.
  • Density functional theory (DFT) calculations for understanding electronic structure and magnetic coupling.

Main Results:

  • Successful assembly of 1D spin chains via covalent linking of molecular building blocks on Au(111).
  • STM/STS revealed distinct Kondo regions associated with individual molecular blocks within the chains.
  • DFT calculations indicated antiferromagnetic coupling between the spin centers in the assembled chains.

Conclusions:

  • The study demonstrates a method for creating 1D spin chains with tunable electronic properties.
  • Antiferromagnetic coupling within the chains is established, paving the way for spintronic applications.
  • This work contributes to the design principles for future nanoscale molecule-based electronic and spintronic devices.