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Videos de Conceptos Relacionados

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.8K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.8K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.8K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.4K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.4K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

16.6K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Heptaceno: Caracterización en solución, en estado sólido y en películas

Ralf Einholz1, Treliant Fang2, Robert Berger3,4

  • 1Institut für Organische Chemie, Universität Tübingen , Auf der Morgenstelle 18, 72076 Tübingen, Germany.

Journal of the American Chemical Society
|March 21, 2017
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Resumen

Los investigadores sintetizaron heptaceno a granel, un semiconductor orgánico clave, utilizando precursores de diheptaceno. Este avance permite el estudio de las propiedades del heptaceno en forma sólida a temperatura ambiente.

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Área de la Ciencia:

  • Productos electrónicos orgánicos
  • Materiales de carbono en nanoescala
  • Química del aceno

Sus antecedentes:

  • Los acenos son semiconductores orgánicos cruciales y modelos de precisión atómica para las nanocintas de grafeno.
  • El heptaceno, el aceno más pequeño, se ha limitado históricamente a estudios de aislamiento de matriz.
  • La confirmación del heptaceno a granel ha sido un desafío de larga data en la ciencia de los materiales.

Objetivo del estudio:

  • Para sintetizar y caracterizar heptaceno a granel.
  • Para investigar la estabilidad y las propiedades del heptaceno en estado sólido.
  • Establecer un método para generar películas de heptaceno para su posterior estudio.

Principales métodos:

  • Reducción de la 7,16-heptacenquinona para formar moléculas de diheptaceno.
  • Escisión térmica de diheptacenos para generar heptaceno en estado sólido.
  • RMN de giro de ángulo mágico de estado sólido 13C para monitorear la ciclorreversión y la estabilidad.

Principales resultados:

  • Síntesis exitosa de los precursores del diheptaceno.
  • Demostración de la escisión térmica de los diheptacenos para producir heptaceno.
  • Determinación de la vida media del heptaceno sólido a temperatura ambiente de varias semanas.
  • Desarrollo de los diheptacenos como precursores de las películas de heptaceno depositadas por vapor.

Conclusiones:

  • Los diheptacenos son precursores eficaces para la generación de heptaceno en estado sólido.
  • El heptaceno sólido es lo suficientemente estable a temperatura ambiente para la caracterización.
  • Este trabajo supera un desafío de 70 años, permitiendo nuevos estudios de materiales de carbono a nanoescala.