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Transporte de carga en moléculas tipo mancuerna basadas en C60: conmutación inducida mecánicamente entre dos estados
Pavel Moreno-García1, Andrea La Rosa, Viliam Kolivoška
1Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, CH-3012 Bern, Switzerland.
Journal of the American Chemical Society
|February 5, 2015
Resumen
El transporte de carga de una sola molécula se estudió utilizando mancuernas de fluoreno con tapa de buckminsterfullereno. Estas moléculas actúan como interruptores controlados mecánicamente, exhibiendo dos estados de conductancia distintos.
Área de la Ciencia:
- La electrónica molecular es la electrónica molecular.
- Nanotecnología La nanotecnología es la nanotecnología.
- Ciencia de los materiales ciencia de los materiales.
Sus antecedentes:
- Investigar el transporte de carga de una sola molécula es crucial para el desarrollo de dispositivos electrónicos moleculares.
- El buckminsterfullereno (C60) y los compuestos a base de fluoreno son bloques de construcción prometedores para la electrónica molecular.
Objetivo del estudio:
- Para investigar las características de transporte de carga de una sola molécula de un nuevo compuesto de mancuernas a base de fluoreno cubierto de buckminsterfullereno (compuesto 1).
- Para explorar el potencial del compuesto 1 como un interruptor molecular accionado mecánicamente.
- Comprender la relación entre la configuración molecular y los estados de conductancia.
Principales métodos:
- Utilizó la unión de ruptura de microscopía de túnel de barrido (STM-BJ), la unión de ruptura de microscopía de fuerza atómica de detección de corriente (CS-AFM-BJ) y las técnicas de unión de ruptura controlada mecánicamente (MCBJ).
- Investiga el comportamiento molecular bajo condiciones ambientales.
- Realizó experimentos de control utilizando moléculas relacionadas (compuesto 2 y 3) para su validación.
Principales resultados:
- El Compuesto 1 forma superficies adyacentes altamente organizadas y libres de defectos, lo que permite una dirección molecular específica.
- Se observaron dos estados distintos de conductancia de una sola molécula, alto (G(H) ((1)) y bajo (G(L) ((1)).
- Los estados de conductancia son dependientes de la presión, lo que permite la funcionalidad de conmutación molecular.
- Los experimentos de control confirmaron la asignación de estados de conductividad a configuraciones moleculares específicas.
Conclusiones:
- El Compuesto 1 funciona como un interruptor molecular accionado mecánicamente debido a sus distintos estados de conductividad.
- Los estados de conductancia observados se atribuyen al túnel de electrones a través del grupo de anclaje de buckminsterfullereno y la molécula completamente extendida.
- El estudio proporciona información sobre el diseño de interruptores moleculares basados en moléculas funcionalizadas de fullereno.
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