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Estudio mecanicista de la isomerización reversible inducida por la migración de hidrógenos en los isómeros

Qinzhen Li¹, Yesen Tan¹, Baoyu Huang^2,3

¹Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei, Anhui 230601, China.

Journal of the American Chemical Society

|July 12, 2023

Resumen

Los investigadores revelaron una isomerización reversible en nanocúmulos de oro (Au NC) utilizando ligandos de hidruro. Un mecanismo de migración [Au-H] explica esta evolución estructural en la materia condensada metálica.

Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
Química Física

Sus antecedentes:

La comprensión de la evolución de los nanocúmulos metálicos es crucial para la materia condensada metálica.
Los ligandos hidruro ofrecen un enfoque simplificado para el estudio de sistemas complejos de nanoclusters.

Objetivo del estudio:

Para aclarar el mecanismo de evolución específico entre los isómeros de nanoagrupación de oro (Au NC).
Investigar el papel de los ligandos hidruro en la dinámica estructural de los nanocúmulos.

Principales métodos:

Síntesis de un hidruro que contiene Au NC, Au22(SR) 15H, mediante control cinético.
Determinación estructural mediante difracción de rayos X, difracción de neutrones y cálculos DFT.
Identificación de los productos intermedios mediante predicciones teóricas y captura experimental.

Principales resultados:

Se observó una isomerización estructural reversible en el nano racimo Au22(SR) 15H.
Se identificó un mecanismo de migración [Au-H] como el proceso clave que impulsa la isomerización.
Se confirmó que el sitio de unión de hidruro es central para el proceso de isomerización.

Conclusiones:

Este estudio proporciona un mecanismo claro para la isomerización de nanocúmulos que involucra a los ligandos hidruro.
Los hallazgos ofrecen información sobre el comportamiento dinámico de los ligandos hidruro dentro de los nanocúmulos.
El uso de ligandos hidruro presenta una nueva estrategia para el estudio de los mecanismos de evolución de nanoclusters.

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