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Spin–Spin Coupling: One-Bond Coupling01:17

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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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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.
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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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Electron Orbital Model01:18

Electron Orbital Model

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Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
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Spin-orbit Coupling Modulation in DNA by Mechanical Deformations.

Solmar Varela Salazar1, Vladimiro Mujica2, Ernesto Medina3

  • 1Yachay Tech, School of Chemical Sciences & Engineering, 100119-Urcuquí, Ecuador, Escuela de Física, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela.

Chimia
|June 27, 2018
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Summary
This summary is machine-generated.

Molecular straining can tune spin-orbit coupling and mobility in DNA. This research probes how stretching or compressing DNA affects its spin-active properties, crucial for understanding the Chiral-Induced Selectivity Effect.

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Area of Science:

  • Condensed Matter Physics
  • Molecular Electronics
  • Biophysics

Background:

  • The Chiral-Induced Selectivity Effect (CISS) demonstrates spin selectivity in chiral molecules, with spin-orbit interaction strength depending on orbital geometry.
  • Understanding spin-orbit coupling in low-dimensional systems, like DNA, is key to controlling spin transport and spin selectivity.
  • Previous models suggest DNA's helical structure and base orbital arrangements contribute to band spin-orbit coupling.

Purpose of the Study:

  • To investigate the impact of molecular straining on mobility and spin-active features in complex molecules, specifically a double-strand DNA model.
  • To explore how mechanical compression and stretching influence spin-orbit coupling and charge transport properties in DNA.
  • To provide an analytical model that explains strain-dependent effects and validates experimental observations.

Main Methods:

  • Theoretical modeling of a double-strand DNA model under tensile and compressive strain.
  • Analysis of strain-dependent kinetic and spin-orbit coupling within two experimentally relevant setups.
  • Comparison of analytical model predictions with experimental trends reported in related studies.

Main Results:

  • Significant tunability of molecular mobility and spin-orbit coupling through applied mechanical strain.
  • Demonstration that molecular geometry, altered by strain, directly impacts spin-orbit interaction strength.
  • The developed analytical model successfully reproduces the qualitative trends observed in strain-dependent experiments.

Conclusions:

  • Molecular straining is an effective method to probe and control spin-active properties in complex molecular systems like DNA.
  • Mechanical deformation offers a pathway to tune spin-orbit coupling, essential for applications leveraging the Chiral-Induced Selectivity Effect.
  • The findings support the hypothesis that specific orbital arrangements, influenced by molecular geometry, are responsible for enhanced spin-orbit interactions.