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La luz polarizada circularmente puede anular y amplificar la asimetría en hélices supramoleculares

Jun Su Kang¹, Sungwoo Kang¹, Jong-Min Suh¹

¹Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.

Journal of the American Chemical Society

|February 3, 2022

Resumen

La luz polarizada circularmente (CPL) puede inducir y amplificar la quiralidad supramolecular. La mano de luz opuesta puede anular la información molecular, revelando puntos críticos de sesgo quiral para la evolución de la homociralidad.

Área de la Ciencia:

Química supramolecular
Química quiral
La fotoquímica

Sus antecedentes:

La luz polarizada circular (CPL) es una entidad quiral que potencialmente impulsa la evolución de la homociralidad.
Existe una comprensión limitada de cómo el momento angular de espín de CPL interactúa con la quiralidad molecular durante la inducción y la amplificación.

Objetivo del estudio:

Investigar la inducción y la amplificación de la quiralidad en un sistema de polimerización supramolecular activado por la luz.
Explorar la competencia entre la mano CPL y la información quiral molecular existente.
Analizar la amplificación no lineal de la información quiral en un sistema de "sargentos y soldados".

Principales métodos:

Utilizó un sistema de polimerización supramolecular activado por la luz.
Aplicación de luz polarizada circular (CPL) con una variedad de manos.
Investigó la transmisión de información quiral y la amplificación no lineal.
Se evaluó la influencia del exceso enantiomérico y el sesgo quiral.

Principales resultados:

Se ha demostrado la amplificación no lineal de la información quiral a través del mecanismo de "sargentos y soldados".
Se observó una mayor amplificación cuando la mano CPL coincidía con la quiralidad molecular.
Encontró que la mano CPL opuesta podría anular la quiralidad molecular con un exceso enantiomérico bajo.
Identificó un sesgo quiral crítico que indica un punto de bifurcación para la evolución de la homociralidad.

Conclusiones:

La quiralidad supramolecular puede ser controlada ortogonalmente, desacoplada de la quiralidad molecular preexistente.
El estudio proporciona información sobre la evolución de la homociralidad bajo la perturbación quiral.
Destaca el potencial de la CPL para dirigir el ensamblaje supramolecular y la quiralidad.

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