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Videos de Conceptos Relacionados

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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.
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...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Alkyl Halides02:45

Alkyl Halides

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Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond 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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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Detección de enlaces halógenos por acoplamientos escalares

Bono Jimmink1, Daniel Sethio1, Lotta Turunen1

  • 1Department of Chemistry-BMC, Uppsala University, SE-75123 Uppsala, Sweden.

Journal of the American Chemical Society
|July 8, 2021
PubMed
Resumen

Las constantes de acoplamiento escalar (J) revelan la fuerza del enlace halógeno en solución. Esta técnica de RMN ofrece nuevos conocimientos sobre las interacciones débiles, ayudando a la caracterización de enlaces halógenos e interacciones moleculares similares.

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Área de la Ciencia:

  • Química supramolecular
  • Física Química
  • Química orgánica

Sus antecedentes:

  • El enlace halógeno es una interacción no covalente crucial, vital en el reconocimiento molecular y el autoensamblaje.
  • La caracterización de los enlaces halógenos en solución es difícil debido a su naturaleza débil y transitoria.
  • Los métodos existentes a menudo carecen de sensibilidad o requieren condiciones específicas.

Objetivo del estudio:

  • Investigar el efecto del enlace halógeno en las constantes de acoplamiento escalar (J).
  • Establecer los acoplamientos escalares como método fiable para cuantificar la fuerza de los enlaces halógenos en solución.
  • Explorar el potencial de este enfoque de RMN para otras interacciones débiles.

Principales métodos:

  • Adquisición y análisis de datos de resonancia magnética nuclear (RMN) para 42 complejos halógenos.
  • Utilizando el diclorometano como medio de solución.
  • Realizar cálculos químicos cuánticos para apoyar los hallazgos experimentales.

Principales resultados:

  • Las constantes de acoplamiento escalares (J) están demostradamente moduladas por enlaces halógenos.
  • El cambio de magnitud en los acoplamientos de un enlace, que se extiende hasta cinco enlaces, se correlaciona con la fuerza del enlace halógeno.
  • Los datos de RMN y los resultados computacionales muestran tendencias consistentes.

Conclusiones:

  • Los acoplamientos escalares proporcionan una nueva herramienta valiosa para caracterizar complejos de enlaces halógenos en solución.
  • Este enfoque basado en RMN puede cuantificar la fuerza de estas interacciones débiles.
  • La metodología es prometedora para estudiar otros tipos de interacciones débiles sigma-agujero.