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Isomerización químicamente reversible de los racimos inorgánicos
Curtis B Williamson1, Douglas R Nevers1, Andrew Nelson2
1Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, USA.
Science (New York, N.Y.)
|February 16, 2019
Resumen
Los grupos de sulfuro de cadmio (CdS) son puentes entre la isomerización molecular y las transformaciones en estado sólido. Estos grupos atómicamente precisos exhiben una reconfiguración sin difusión, revelando estados intermedios en los cambios estructurales.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Física Química
Sus antecedentes:
- Las transformaciones estructurales generalmente se estudian en sistemas moleculares o sólidos aislados.
- Los estados intermedios en estas transformaciones han sido difíciles de caracterizar experimentalmente.
- Los cúmulos atómicamente precisos ofrecen una plataforma potencial para el estudio de tales fenómenos.
Objetivo del estudio:
- Investigar la isomerización en sistemas de agrupación de sulfuro de cadmio (CdS) bien definidos y atómicamente precisos.
- Para unir el estudio de la isomerización molecular y las transformaciones sólido-sólido.
- Caracterizar los sistemas intermedios en las transformaciones estructurales.
Principales métodos:
- Se utilizaron isómeros de clúster de sulfuro de cadmio (CdS) como plataforma experimental.
- Estudió la interconversión coherente entre los isómeros del racimo.
- Analizó la barrera de energía y el cambio en las brechas de energía excitónica.
- Investigó el papel de los motivos de unión a los ligandos y las especies hidroxilas.
Principales resultados:
- Los isómeros del grupo CdS se interconvierten de manera coherente a través de una barrera de energía de ~ 1 electrón-voltio.
- Se observó un cambio de voltaje de 140 milielectrones en las brechas de energía excitónica.
- Se produjo una reconfiguración de desplazamiento sin difusión del núcleo inorgánico, similar a una transformación sólido-sólido.
- La cinética de la transformación fue de primer orden, similar a la isomerización molecular.
- La energía superficial, influenciada por las especies hidroxilo, dicta la estabilidad de fase.
Conclusiones:
- Los grupos de CdS sirven como una plataforma ventajosa para estudiar la isomerización a través de escalas de longitud.
- La transformación observada exhibe características tanto de transformaciones sólido-sólido como de isomerizaciones moleculares.
- Este trabajo cierra la brecha entre los cambios estructurales moleculares y de estado sólido.
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