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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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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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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Borazine: spin blocker or not?

Debojit Bhattacharya1, Suranjan Shil, Anirban Misra

  • 1Department of Marine Sciences, Texas A&M University at Galveston, Texas, 77553, USA. debojitilora@gmail.com.

Physical Chemistry Chemical Physics : PCCP
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Borazine

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Area of Science:

  • Quantum Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Investigating spin blockers is crucial for molecular spintronics.
  • Borazine's electronic properties offer potential for novel magnetic materials.
  • Understanding magnetic exchange interactions is key to designing functional molecular devices.

Purpose of the Study:

  • To investigate the spin-blocking capacity of borazine derivatives.
  • To elucidate the role of the lowest unoccupied molecular orbital (LUMO) in magnetic exchange.
  • To correlate magnetic properties with aromaticity indices like NICS and HOMA.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Calculated Nuclear-Independent Chemical Shift (NICS) and Harmonic Oscillator Model of Aromaticity (HOMA) values.
  • Analyzed spin-exchange mechanisms mediated by LUMO and SOMOs in diradical systems.

Main Results:

  • Borazine exhibits lower aromaticity than benzene due to polar B-N π-bonding.
  • LUMO-mediated spin-exchange significantly influences magnetic coupling.
  • The parity of coupler pathways dictates the nature and extent of magnetic exchange.

Conclusions:

  • Borazine's spin-blocking ability is linkage-dependent and can enhance coupling in some cases.
  • Borazine's magnetic properties differ from carbon-based analogues.
  • DFT and aromaticity indices provide insights into designing molecular spin-blockers.