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Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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Cristales líquidos columnares octupolares π-conjugados electrofuncionales de cristales líquidos.

Takuma Yasuda¹, Tomohiro Shimizu, Feng Liu

¹Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Journal of the American Chemical Society

|July 28, 2011

Resumen

Las nuevas moléculas en forma de hélice exhiben transporte de carga ambipolar en cristales líquidos. Estas estructuras octupolares se autoorganizan en nanoestructuras para una conducción eficiente de electrones y agujeros.

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Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Electrónica orgánica y electrónica orgánica.
Química supramolecular de las moléculas.

Sus antecedentes:

El desarrollo de materiales orgánicos con propiedades de transporte de carga ambipolar es crucial para los dispositivos electrónicos avanzados.
Las moléculas octopolares π-conjugadas ofrecen características únicas de autoensamblaje y características electrónicas.
Los materiales cristalinos líquidos proporcionan estructuras ordenadas para el transporte eficiente de cargas.

Objetivo del estudio:

Diseñar y sintetizar nuevas moléculas π-conjugadas en forma de hélice para aplicaciones líquido-cristalinas de transporte de carga ambipolar.
Para investigar el comportamiento de autoensamblaje y las propiedades de transporte de carga de estas moléculas octupolares.
Establecer un enfoque versátil para la creación de materiales nanoestructurados 1D con propiedades electrónicas sintonizables.

Principales métodos:

Síntesis de moléculas de hélice basadas en 2,4,6-tris ((tiofeno-2-il) -1,3,5-triazina.
Mediciones del tiempo de vuelo para determinar la movilidad del transportista.
Voltametría cíclica y cálculos teóricos para analizar estructuras electrónicas.

Principales resultados:

Sintetizó con éxito moléculas octupolares en forma de hélice con segmentos donantes y receptores de electrones.
Se observó la autoorganización en nanoestructuras columnares unidimensionales.
Comportamiento de transporte de portador ambipolar demostrado, que facilita la conducción de electrones y agujeros.

Conclusiones:

Las moléculas octupolares diseñadas se autoensamblan en nanoestructuras 1D ordenadas, lo que permite el transporte de carga ambipolar.
Este trabajo proporciona una nueva estrategia para el desarrollo de materiales conductores ambipolares conductores líquidos cristalinos avanzados.
Los hallazgos ofrecen directrices para el futuro diseño molecular en electrónica orgánica.