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Sólidos de red orgánicos semiconductores plomo-azufre-azufre.

Dayna L Turner1, Thomas P Vaid, Peter W Stephens

  • 1Department of Chemistry and Center for Materials Innovation, Washington University, St. Louis, Missouri 63130, USA.

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Resumen

Los nuevos polímeros de coordinación de plomo sintetizados a partir de benzenetiols y etilendiamina exhiben diversas estructuras y propiedades. Los materiales resultantes van desde unidades moleculares hasta enlaces de tipo sólido inorgánico, con un compuesto identificado como semiconductor.

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Área de la Ciencia:

  • Coordinación Química de la Coordinación
  • Ciencia de los materiales Ciencia de los materiales.
  • Química del estado sólido.

Sus antecedentes:

  • Los compuestos de plomo y sus polímeros de coordinación son de interés debido a sus diversos motivos estructurales y aplicaciones potenciales.
  • Los benzenetiolos sirven como versátiles ligandos para la construcción de complejas estructuras metal-orgánicas.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevos polímeros de coordinación de plomo utilizando diferentes ligandos de benzenetiol.
  • Investigar la diversidad estructural y las características de unión de estos nuevos materiales.
  • Explorar la relación entre la estructura y las propiedades, particularmente la conductividad eléctrica.

Principales métodos:

  • Reacciones del acetato de plomo (II) con el 1,2,4,5-benzenetetratiol, el 1,4-benzenedithiol y el benzenehexatiol en la etilenediamina.
  • Determinación de la estructura mediante difracción de polvo de rayos X sincrotrón y difracción de rayos X monocristalino.
  • Análisis de los modos de unión y correlación con las propiedades ópticas y eléctricas.

Principales resultados:

  • Síntesis de tres polímeros de coordinación de plomo distintos: [Pb2 (S2C6H2S2) ] (amarillo), [Pb3 (SC6H4S) ] (rojo naranja) y [Pb3C6S6] (marrón).
  • La aclaración estructural reveló unidades "moleculares" en [Pb2 (((S2C6H2S2) ((en)) n y enlaces de tipo sólido inorgánico en [Pb3C6S6] n.
  • [Pb3C6S6]n fue identificado como un semiconductor, lo que indica propiedades electrónicas variadas.

Conclusiones:

  • La elección del ligando benzenetiol influye significativamente en la estructura y enlace de los polímeros de coordinación de plomo.
  • Los materiales sintetizados exhiben un espectro de tipos de enlaces, desde ensamblajes moleculares discretos hasta redes inorgánicas extendidas.
  • El comportamiento semiconductor de [Pb3C6S6]n destaca el potencial para ajustar las propiedades electrónicas en estos sistemas de plomo-azufre.