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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

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...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

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El transporte coherente a través del cruce de espín de moléculas individuales.

Daniel Aravena1, Eliseo Ruiz

  • 1Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, Barcelona E-08028, Spain.

Journal of the American Chemical Society
|December 31, 2011
PubMed
Resumen

Los estados de alto espín en los complejos de hierro (II) conducen la electricidad mejor que los estados de bajo espín. Estos estados de alto espín también actúan como filtros de espín, creando una corriente polarizada.

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Área de la Ciencia:

  • La química cuántica es una química cuántica.
  • Ciencia de los materiales ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada

Sus antecedentes:

  • Los materiales de cruce de espín (SCO) exhiben propiedades magnéticas distintas basadas en sus estados de espín.
  • Comprender las propiedades de transporte electrónico de los complejos SCO es crucial para la electrónica molecular.

Objetivo del estudio:

  • Para investigar las propiedades de transporte cuántico de un complejo Fe (((II) mononuclear que exhibe un comportamiento de cruce de espín.
  • Para comparar la conductividad y las capacidades de filtrado de espín de los estados de alto y bajo espín.

Principales métodos:

  • Cálculos de la Teoría Funcional de la Densidad (DFT).
  • Función de Green de no equilibrio (NEGF) procedimiento para el transporte cuántico coherente.
  • Análisis de la conductividad dependiente del espín.

Principales resultados:

  • El estado de alto espín exhibe una conductividad eléctrica significativamente mayor en comparación con el estado de bajo espín.
  • El complejo en su estado de alto espín funciona como un eficiente filtro de espín.
  • Una corriente polarizada β se genera en el estado de alto espín.

Conclusiones:

  • La ingeniería del estado de giro en complejos de Fe (II) puede modular sus propiedades de transporte electrónico.
  • El efecto de filtro de espín observado en el estado de alto espín abre posibilidades para aplicaciones espintrónicas.
  • Los métodos DFT y NEGF proporcionan un marco sólido para predecir el transporte cuántico en sistemas moleculares.