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La permitilación introduce una interferencia cuántica destructiva en los silanos saturados

Marc H Garner1, Haixing Li2, Madhav Neupane3

  • 1Nano-Science Center and Department of Chemistry , University of Copenhagen , Universitetsparken 5, 2100 Copenhagen Ø , Denmark.

Journal of the American Chemical Society
|September 11, 2019
PubMed
Resumen

Los grupos metilo son clave para la interferencia cuántica destructiva en la conductividad del silano. Esta interferencia, ausente en los alcanos simples, se observa en los alcanos permitilados, revelando efectos de sustitución en la electrónica molecular.

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Área de la Ciencia:

  • La electrónica molecular
  • Química cuántica
  • Química orgánica

Sus antecedentes:

  • La conductividad de una sola molécula en las silanas es suprimida por la interferencia cuántica destructiva.
  • Esta interferencia, vinculada a los ángulos diédricos cisoideos, no se observa en alcanos estructuralmente similares.

Objetivo del estudio:

  • Investigar el papel de los sustituyentes del metilo en los efectos de interferencia en silanos y alcanos.
  • Comprender el impacto de los sustituyentes en las propiedades de transporte de electrones en las moléculas saturadas.

Principales métodos:

  • Cálculos de la teoría funcional de densidad (DFT) para modelar el transporte de electrones.
  • Experimentos de ruptura del microscopio de túnel de barrido (STM-BJ) para medir la conductividad de una sola molécula.

Principales resultados:

  • Los sustituyentes del metilo son esenciales para la observación de la interferencia σ en los silanos.
  • Los silanos no metilados y los alcanos simples no exhiben el mismo nivel de interferencia destructiva.
  • Los alcanos cíclicos y bicíclicos permitilados muestran una conductividad significativamente suprimida.
  • El ciclohexano y el biciclo[2.2.2]octano funcionalizados exhiben una mayor conductividad que los silanos permitilados.

Conclusiones:

  • La diferencia en el transporte de electrones entre los alcanos y los silanos se debe principalmente a los sustituyentes de metilo, no a los átomos de la columna vertebral (C vs. Si).
  • Los sustituyentes químicos influyen críticamente en la conductividad de una sola molécula en moléculas orgánicas saturadas.
  • La consideración de los sustituyentes es vital para diseñar moléculas con propiedades electrónicas específicas.