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Estado de orden de carga mixta de los complejos de platino casi unidimensional de tipo MMX con puentes de yoduro y
Hiroaki Iguchi1, Shinya Takaishi, Takashi Kajiwara
1Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-aoba, Aramaki, Sendai 980-8578, Japan.
Journal of the American Chemical Society
|December 10, 2008
Resumen
Los investigadores desarrollaron un nuevo estado de orden de carga (CO) en cadenas MMX cuasi-1D mediante la introducción de diversas contramedidas. Este nuevo estado ACP + CDW exhibe propiedades estructurales y electrónicas únicas, confirmadas por análisis de rayos X y espectroscópicos.
Área de la Ciencia:
- Química del estado sólido.
- Ciencia de los materiales ciencia de los materiales.
- La química de la coordinación es química de la coordinación.
Sus antecedentes:
- Los complejos de Pt dinucleares con puentes de ioduro casi-1D (cadenas MMX) son conocidos por diversos fenómenos de ordenamiento de carga (CO).
- Comprender y controlar estos estados de CO es crucial para el desarrollo de nuevos materiales electrónicos.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo estado de orden de carga (CO) en cadenas MMX.
- Investigar las propiedades estructurales y electrónicas de este nuevo estado de CO.
- Explorar la influencia de las contramedidas en la formación de estados de CO.
Principales métodos:
- Síntesis de K{2}{3}{4}{3}NCH{2}CHMeCH{2}NH{3}{Pt{2}{4}{4}{4}{I}{4}{2}{4}{2}{2}{2}{2}{2}{3}{4}{4}{4}{2}{2}{2}{2}{3}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}{4}}{4}}{4}{4}}}}{4}}{4}}}}{4}
- Análisis de la estructura cristalina para determinar las características estructurales.
- Fotografía de oscilación de rayos X para verificar el ordenamiento tridimensional.
- Espectroscopia Raman polarizada y espectroscopia RMN 31P MAS para sondear estados electrónicos y entornos atómicos.
Principales resultados:
- Un nuevo estado de orden de carga (CO), denominado estado ACP + CDW, se desarrolló con éxito en las cadenas MMX.
- La estructura cristalina reveló características de ambos estados alternativos de polarización de carga (ACP) y de onda de densidad de carga (CDW).
- Las fuertes reflexiones de la superred confirman la estructura ordenada tridimensional.
- Los datos espectroscópicos indicaron la presencia de dos unidades distintas de Pt(2) y cuatro átomos de P no equivalentes, consistentes con el estado ACP+CDW.
Conclusiones:
- La introducción de contramedidas específicas permite la formación de un nuevo estado ACP+CDW en las cadenas MMX.
- Este nuevo estado exhibe características únicas de ordenamiento estructural y características electrónicas.
- Los hallazgos proporcionan información sobre la sintonizabilidad de los fenómenos de ordenamiento de carga en materiales cuasi-1D.
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