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Cristalinidad líquida columnar y mecanocromismo en complejos catiónicos de platino (II)
Markrete Krikorian1, Shuang Liu, Timothy M Swager
1Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|February 19, 2014
Resumen
Los complejos catiónicos de platino (II) exhiben propiedades de cristales líquidos y cambios de color reversibles cuando son estresados mecánicamente o expuestos a disolventes. Este descubrimiento abre caminos para nuevos materiales sensibles.
Área de la Ciencia:
- Coordinación Química de la Coordinación
- Ciencia de los materiales Ciencia de los materiales.
- Química supramolecular de las moléculas.
Sus antecedentes:
- Los complejos catiónicos cuadrados planos de platino ((II) son conocidos por sus diversas geometrías de coordinación y aplicaciones potenciales.
- Las interacciones intermoleculares juegan un papel crucial en el autoensamblaje y las propiedades de los compuestos de coordinación.
- Lograr el comportamiento cristalino líquido en complejos de coordinación a menudo requiere diseños moleculares específicos, como múltiples cadenas laterales.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos complejos catiónicos cuadrados planos de platino (II).
- Investigar el comportamiento de autoensamblaje y las propiedades cristalinas líquidas de estos complejos.
- Para explorar el comportamiento de respuesta a estímulos, específicamente el mecanocromismo, de los materiales cristalinos.
Principales métodos:
- Síntesis de complejos catiónicos cuadrados planos de platino (II). complejos.
- Análisis de difracción de rayos X monocristalino para determinar la estructura molecular y el empaque.
- Calorimetría de barrido diferencial (DSC) y microscopía óptica polarizada (POM) para evaluar el comportamiento cristalino líquido termotrópico.
- Técnicas espectroscópicas de estado sólido para monitorear las transformaciones mecanocrómicas.
Principales resultados:
- Los complejos sintetizados de platino exhiben altos grados de asociación intermolecular en estado sólido.
- Estos complejos demuestran un comportamiento cristalino líquido columnar termotrópico, a pesar de poseer sólo una cadena lateral.
- Los cristales se someten a transformaciones mecanocrómicas reversibles tras el estrés mecánico y el tratamiento con disolventes.
Conclusiones:
- Los complejos catiónicos cuadrados planos de platino ((II) pueden autoensamblarse en fases cristalinas líquidas con una funcionalidad mínima.
- El mecanocromismo observado indica potencial para el desarrollo de materiales sensibles basados en compuestos de coordinación de platino.
- La reversibilidad del efecto mecanocrómico sugiere posibilidades para aplicaciones de materiales reciclables y sintonizables.
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