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Los cationes de borenio de las subporfirinas planas son subporfirinas planas
Eiji Tsurumaki1, Shin-ya Hayashi, Fook S Tham
1Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
Journal of the American Chemical Society
|July 20, 2011
Resumen
Se sintetizaron y caracterizaron nuevos cationes de borenio y subporfirina. Su estructura casi plana y su reactividad ofrecen nuevas vías en la investigación de la química del boro.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química del boro y su química.
- Los análogos de la porfirina son análogos de la porfirina.
Sus antecedentes:
- Las subporfirinas son compuestos macrocíclicos con propiedades electrónicas únicas.
- Los cationes de boro son reactivos intermedios en la química del organoboro.
- Los carboranos sirven como versátiles contrarios en la química inorgánica y organometálica.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos cationes de subporfirina y borenio.
- Investigar las propiedades estructurales y electrónicas de estos nuevos compuestos.
- Para explorar la reactividad de los cationes de borenio y subporfirina.
Principales métodos:
- Tratamiento de las subporfirinas B-metoxi con un reactivo de silicio (Et3Si(CH6B11Br6)).
- Cristalografía de rayos X para determinar la estructura del catión de trifenilsubporfirina y borenio.
- Análisis espectroscópico (absorción y fluorescencia) de los cationes sintetizados.
- Reacción de los cationes de borenio subporfirina con el fenillitio.
Principales resultados:
- Síntesis exitosa de subporfirina de cationes de borenio con un contraparte de carborano.
- La estructura de rayos X reveló un catión de borenio de trifenilsubporfirina casi plano con borón hibridado sp2.
- Los espectros de absorción y fluorescencia fueron similares a los de las B-metoxisubporfirinas.
- Las subporfirinas de B-fenilo se obtuvieron en buen rendimiento a través de la reacción con fenillitio.
Conclusiones:
- Los cationes de borenio subporfirina poseen una estructura plana, a diferencia de los relacionados con los cationes de borenio subftalocianina.
- Estos cationes son estables y exhiben propiedades espectroscópicas características.
- La reactividad de los cationes de borenio de la subporfirina permite la síntesis de subporfirinas funcionalizadas.
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