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Complejos de oxoborilo: enlaces triples boro-oxígeno estabilizados en la esfera de coordinación del platino
Holger Braunschweig1, Krzysztof Radacki, Achim Schneider
1Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. h.braunschweig@mail.uni-wuerzburg.de
Science (New York, N.Y.)
|April 17, 2010
Resumen
Los investigadores informan de la primera formación estable de un complejo de oxoborilo, trans-[(Cy3P) 2BrPt(B[triple enlace]O) a temperatura ambiente. Esta especie de boro-oxígeno unido al platino exhibe un enlace triple único, resistiendo la degradación en diversas condiciones.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química organometálica Química orgánica de los metales.
- Química del boro y su química.
Sus antecedentes:
- Los oxoboranos monoméricos son típicamente especies transitorias, observadas sólo en experimentos especializados de aislamiento en fase gaseosa o en matriz de baja temperatura.
- La síntesis y caracterización de compuestos estables con arreglos de enlace inusuales sigue siendo un desafío clave en la química inorgánica.
Objetivo del estudio:
- Para sintetizar y caracterizar un complejo oxoboril monomérico estable a temperatura ambiente.
- Para confirmar la presencia y la naturaleza del enlace boro-oxígeno dentro del complejo.
Principales métodos:
- Reacción del dibromo ((trimethylsiloxy) borano con [Pt ((PCy3) 2) ] en una solución de tolueno.
- Caracterización mediante métodos espectroscópicos (por ejemplo, RMN, IR) y análisis de difracción de rayos X. Análisis de difracción de rayos X.
- Estudios computacionales para analizar las características de enlace.
Principales resultados:
- Formación del complejo oxoborílico estable trans-[(Cy3P) 2BrPt(B[triple enlace]O) ] a través de la eliminación reversible del trimetilsililbromuro.
- El complejo demostró inercia hacia la oligomerización, incluso bajo estrés fotolítico y térmico.
- La sustitución de bromuro por tiofenolato produjo un complejo relacionado, apoyando aún más la asignación estructural.
- Los datos experimentales y computacionales confirmaron un triple enlace boro-oxígeno, evidenciado por una corta distancia B-O (120.5(7) pm) y el acortamiento del enlace.
Conclusiones:
- Los complejos estables y monoméricos de oxoborilo pueden sintetizarse y aislarse en condiciones ambientales.
- El estudio proporciona una fuerte evidencia de un enlace triple de boro-oxígeno estabilizado con platino.
- Este trabajo amplía la química conocida de los compuestos de boro-oxígeno y ofrece información sobre la unión inusual.
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