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

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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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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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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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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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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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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sp3d and sp3d 2 Hybridization
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Exceptionally large "through-space" nuclear spin coupling in a 2,4,6-tri(phosphanyl)-1,3,5-triphosphabenzene.

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  • 1Department of Chemistry, Indiana University 800 East Kirkwood Ave. Bloomington Indiana 47405 USA jgoicoec@iu.edu.

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Researchers synthesized a unique phosphanyl-functionalized 1,3,5-triphosphabenzene with a large spin-spin coupling (432 Hz) between phosphorus-31 nuclei. This interaction, influenced by orbital overlap, can be modulated by chemical modification.

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Area of Science:

  • Organometallic Chemistry
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Computational Chemistry

Background:

  • 1,3,5-triphosphabenzene derivatives are explored for unique electronic properties.
  • Spin-spin coupling (SSC) provides insights into molecular structure and bonding.
  • Understanding transmission pathways of SSC is crucial for chemical applications.

Purpose of the Study:

  • To synthesize a novel phosphanyl-functionalized 1,3,5-triphosphabenzene.
  • To investigate the unusually large indirect spin-spin coupling (SSC) between phosphorus-31 nuclei.
  • To computationally elucidate the mechanisms governing this spin-spin coupling.

Main Methods:

  • Synthesis of phosphanyl-functionalized 1,3,5-triphosphabenzene.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for spin-spin coupling measurement.
  • Density Functional Theory (DFT) calculations to analyze transmission pathways.

Main Results:

  • A phosphanyl-functionalized 1,3,5-triphosphabenzene with a 432 Hz indirect spin-spin coupling (SSC) was synthesized.
  • DFT calculations revealed significant s-orbital character contributing to effective orbital overlap.
  • Chemical oxidation of phosphanyl groups disrupted the 'through-space' SSC pathway, yielding 'through-bond' coupling.

Conclusions:

  • The study demonstrates a novel phosphabenzene with significant phosphorus-31 spin-spin coupling.
  • Computational analysis successfully deconvoluted 'through-space' and 'through-bond' SSC mechanisms.
  • Chemical modification provides a method to tune and control spin-spin coupling interactions.