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Spin–Spin Coupling Constant: Overview01:08

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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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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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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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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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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Coherent Spin Dynamics in Molecular Cr8Zn Wheels.

Alberto Ghirri1, Alessandro Chiesa2, Stefano Carretta2

  • 1Istituto Nanoscienze-CNR , via G. Campi 213A, 41125 Modena, Italy.

The Journal of Physical Chemistry Letters
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Researchers explored molecular spin states in Cr8Zn molecular wheels using electron paramagnetic resonance (EPR) spectroscopy. Understanding decoherence mechanisms is key for advancing molecular quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Molecular Magnetism
  • Spectroscopy

Background:

  • Controlling molecular spin states is crucial for developing qubits.
  • Polynuclear chromium-zinc (Cr8Zn) molecular wheels are promising candidates for quantum information processing.

Purpose of the Study:

  • To investigate transitions between molecular spin states in Cr8Zn molecular wheels.
  • To understand decoherence mechanisms affecting spin qubit stability.

Main Methods:

  • Utilized 241 GHz electron paramagnetic resonance (EPR) spectroscopy on single crystals.
  • Performed continuous wave and spin echo experiments at high magnetic fields.
  • Analyzed temperature dependence of dephasing time (T2) down to 1.35 K.

Main Results:

  • Spin Hamiltonian calculations accurately reproduced continuous wave spectra.
  • Identified transitions involving mixed spin states at anticrossings.
  • Observed suppression of intermolecular dipolar interactions at low temperatures.

Conclusions:

  • Decoherence mechanisms, including hyperfine and dipolar interactions, were elucidated.
  • Understanding these mechanisms is vital for utilizing molecular states in quantum computing.
  • This research provides insights into the practical application of molecular spin states for quantum technologies.