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Redes totalmente inorgánicas y tetrámeros basados en estaño (II) que contienen polioxometalatos: sintonización de
Chongchao Zhao1, Elliot N Glass, Bryant Chica
1Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University , Atlanta, Georgia 30322, United States.
Journal of the American Chemical Society
|July 31, 2014
Resumen
Este estudio introduce nuevas redes de polioxometalato (POM) que contienen estaño (II) y un tetramero con estructuras únicas. Estos materiales exhiben propiedades electrónicas inusuales debido a las interacciones de pares solitarios, lo que lleva a la absorción de luz visible.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- Química del estado sólido.
Sus antecedentes:
- Los polioxometalatos (POM) son grupos inorgánicos versátiles con diversas aplicaciones.
- La incorporación de pares solitarios estereoactivos en los POM puede conducir a propiedades electrónicas y ópticas únicas.
- Los POM que contienen estaño están menos explorados, pero ofrecen potencial para nuevas funcionalidades.
Objetivo del estudio:
- Sintetizar y caracterizar nuevas redes totalmente inorgánicas basadas en polioxometalato y un tetramero molecular que contiene estaño (II).
- Investigar las características estructurales y propiedades electrónicas de estos nuevos compuestos de POM.
- Comprender el papel de los pares solitarios estereoactivos en Sb (III) y Sn (II) en la determinación de las propiedades ópticas.
Principales métodos:
- Difracción de rayos X para la caracterización estructural.
- Métodos espectroscópicos (por ejemplo, espectroscopia transitoria, espectroscopia Raman de resonancia) para la estructura y dinámica electrónica.
- Cálculos de la Teoría Funcional de Densidad (DFT, por sus siglas en inglés) para obtener información teórica.
Principales resultados:
- Se sintetizaron dos redes basadas en polioxometalato (POM), [Na7X2W18Sn9Cl5O68·(H2O) m]n (X = Si, Ge), y un tetramero molecular, Na6[{Na(μ-OH2)(OH2)2}6{Sn6(B-SbW9O33)2}2]·50H2O.
- Las redes representan la mayor nuclealidad de POMs que contienen Sn ((II) reportada hasta la fecha.
- El tetramero exhibe una interacción Sb·Sb de largo alcance y una transición de transferencia de carga intramolecular (ICT) que involucra pares aislados de Sb{III} y Sn{II}.
Conclusiones:
- Los compuestos sintetizados muestran motivos estructurales únicos en POMs que contienen estaño.
- La transición de las TIC en el tetramero se atribuye al efecto sinérgico de los pares solitarios estereoactivos en Sb (III) y Sn (II).
- Estos hallazgos abren vías para el diseño de POM con propiedades ópticas adaptadas para aplicaciones de luz visible.
![The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F54498.jpg&w=3840&q=50)
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