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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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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...
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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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Locking and Unlocking the Molecular Spin Crossover Transition.

Xin Zhang1, Paulo S Costa1, James Hooper2

  • 1Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, 68588-0299, USA.

Advanced Materials (Deerfield Beach, Fla.)
|August 29, 2017
PubMed
Summary
This summary is machine-generated.

The spin crossover transition in an iron complex can be locked in a low-spin state using substrates or additives. X-ray irradiation reversibly switches it to a high-spin state, controllable around room temperature.

Keywords:
X-ray excited spin statesspin crossover transitionspin-state lockingsubstrate interactionszwitterionic complexes

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Spin crossover (SCO) complexes exhibit distinct electronic states (low-spin and high-spin) controllable by external stimuli.
  • The SCO complex [Fe{H2 B(pz)2 }2 (bipy)] typically transitions around 160 K.
  • Controlling SCO behavior at higher temperatures, especially near room temperature, is crucial for device applications.

Purpose of the Study:

  • To investigate methods for locking the spin state of [Fe{H2 B(pz)2 }2 (bipy)] above its intrinsic transition temperature.
  • To explore the influence of substrate interactions and chemical additives on SCO behavior.
  • To demonstrate reversible manipulation of the spin state using external stimuli like X-ray irradiation.

Main Methods:

  • Fabrication of nanometer thin films of the SCO complex on dielectric substrates (SiO2, Al2O3).
  • Preparation of powder samples by mixing the SCO complex with a zwitterionic additive (p-benzoquinonemonoimine).
  • Characterization of spin states using X-ray irradiation and temperature-dependent measurements.

Main Results:

  • The spin state of [Fe{H2 B(pz)2 }2 (bipy)] was successfully locked in a low-spin configuration above 160 K via substrate interactions or additive mixing.
  • Incident X-ray fluences induced a reversible transition to the high-spin state at temperatures up to and above room temperature (200 K).
  • The locked low-spin state could be restored by slight heating above room temperature.

Conclusions:

  • The spin crossover transition can be effectively manipulated and locked using tailored electrostatic and chemical environments.
  • Reversible switching between spin states around room temperature is achievable, opening possibilities for novel electronic devices.
  • This work provides a pathway for designing SCO materials with tunable transition temperatures and stimuli-responsive behavior.