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Spin–Spin Coupling: One-Bond Coupling01:17

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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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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.
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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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Toward Tailored All-Spin Molecular Devices.

Maciej Bazarnik1,2, Bernhard Bugenhagen3, Micha Elsebach1

  • 1Department of Physics, University of Hamburg , Jungiusstrasse 11, D-20355 Hamburg, Germany.

Nano Letters
|December 26, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed stable molecular spintronic devices using cobalt-salophene building blocks. These devices operate at higher temperatures than previous atomic-scale prototypes, paving the way for energy-efficient computing.

Keywords:
Ullmann couplingelectrospray depositionmolecular self-assemblysalene-complexscanning tunneling microscopyspintronic

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Computing

Background:

  • Spintronic devices promise energy-efficient information technology due to their small size, high speed, and low power consumption.
  • Previous atomic-scale logic devices, while functional, were limited by extremely low operating temperatures.

Purpose of the Study:

  • To develop more stable spintronic devices operating at higher temperatures.
  • To explore the use of tailored molecular building blocks for spintronic applications.

Main Methods:

  • Utilized cobalt-salophene based molecular building blocks.
  • Employed in situ electrospray deposition under ultrahigh vacuum conditions.
  • Controlled surface-confined molecular assembly at the nanometer scale.

Main Results:

  • Demonstrated the creation of a stable spintronic device structure using paramagnetic molecular building blocks.
  • Successfully fabricated molecular spin-wires, gates, and tails.
  • Achieved an order of magnitude higher operating temperatures compared to previous substrate-mediated schemes.

Conclusions:

  • Tailored molecular building blocks, specifically Co-Salophene, offer a pathway to stable, higher-temperature spintronic devices.
  • Molecular self-assembly enables inherent parallel fabrication, enhancing manufacturing efficiency.
  • Covalent through-bond linkage in molecular units provides stronger coupling than indirect exchange coupling in atomic systems.