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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

2.6K
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.1K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Updated: Sep 26, 2025

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Materiales supramoleculares activos alimentados eléctricamente

Serxho Selmani1,2, Eric Schwartz1,2, Justin T Mulvey1,3

  • 1Center for Complex and Active Materials, University of California, Irvine, Irvine, California 92697, United States.

Journal of the American Chemical Society
|April 21, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un autoensamblaje disipatorio impulsado eléctricamente para materiales supramoleculares activos. Este nuevo método ofrece un control preciso y una cinética rápida, lo que permite la integración en dispositivos electrónicos.

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Área de la Ciencia:

  • Química supramolecular
  • Ciencias de los materiales
  • La electroquímica

Sus antecedentes:

  • Los autoensamblajes disipativos impulsados por combustible son cruciales para los sistemas biológicos, permitiendo estructuras y funciones complejas.
  • Los materiales disipadores existentes utilizan combustibles químicos o ligeros, dejando la energía eléctrica sin explorar.
  • Los materiales supramoleculares activos son esenciales para las aplicaciones avanzadas.

Objetivo del estudio:

  • Introducir una plataforma novedosa para el autoensamblaje disipacional con combustible eléctrico.
  • Demostrar la creación de materiales supramoleculares activos utilizando energía eléctrica.
  • Explorar el potencial de este enfoque en aplicaciones bioelectrónicas.

Principales métodos:

  • Utilizando una red de reacción redox electroquímica para impulsar el autoensamblaje.
  • Investigando la cinética, la direccionalidad y el control espacio-temporal del ensamblaje.
  • Caracterizar las propiedades de los materiales supramoleculares alimentados eléctricamente.

Principales resultados:

  • Demostración exitosa de un autoensamblaje disipador impulsado eléctricamente.
  • Se han logrado ensamblajes supramoleculares transitorios y altamente activos.
  • Exhibió una cinética rápida, direccionalidad y un control espacial-temporal preciso.

Conclusiones:

  • El autoensamblaje disipatorio impulsado eléctricamente ofrece una nueva ruta a los materiales supramoleculares activos.
  • Este enfoque proporciona ventajas significativas en el control y la velocidad con respecto a los métodos existentes.
  • La tecnología es prometedora para su integración en dispositivos electrónicos para la bioelectrónica.