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Related Concept Videos

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

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

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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 in...
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Related Experiment Video

Updated: Jun 12, 2026

Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
11:44

Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Published on: November 12, 2016

Using one spin-transition to trigger another in solid solutions of two different spin-crossover complexes.

Malcolm A Halcrow1

  • 1School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT. m.a.halcrow@leeds.ac.uk

Chemical Communications (Cambridge, England)
|June 5, 2010
PubMed
Summary
This summary is machine-generated.

Solid solutions containing cobalt and iron complexes were synthesized. The spin state of cobalt dopants is influenced by the spin state of iron centers in these materials.

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Area of Science:

  • Coordination chemistry
  • Materials science
  • Solid-state chemistry

Background:

  • Spin-crossover (SCO) materials exhibit distinct magnetic states.
  • Doping is a common strategy to tune SCO properties.
  • Cobalt(II) complexes can exhibit spin-state transitions.

Purpose of the Study:

  • To prepare phase-pure solid solutions of [Co(terpy)2][BF4]2 and [M(bpp)2][BF4]2 (M = Fe or Ru).
  • To investigate the influence of host matrix spin-state on dopant spin-state.
  • To explore the potential for spin-state modulation in mixed-metal systems.

Main Methods:

  • Solid-state synthesis of coordination complexes.
  • Characterization using techniques like X-ray diffraction and magnetic susceptibility measurements.
  • Doping of [Co(terpy)2][BF4]2 into [Fe(bpp)2][BF4]2 matrices.

Main Results:

  • Phase-pure solid solutions were successfully prepared.
  • The spin-state of the [Co(terpy)2]2+ dopant was found to be modulated by the spin-state of the [Fe(bpp)2]2+ host centers.
  • Evidence of spin-state coupling between dopant and host was observed.

Conclusions:

  • The spin-state of [Co(terpy)2]2+ can be controlled by the spin-state of the [Fe(bpp)2]2+ matrix.
  • This work demonstrates a strategy for tuning magnetic properties through host-guest interactions in solid solutions.
  • The findings have implications for the design of molecular switches and magnetic materials.