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High Resolution Physical Characterization of Single Metallic Nanoparticles
Published on: June 28, 2019
Un complejo de metales de transición tardía oxo complejo: K7Na9[O=PtIV(H2O) L2], L = [PW9O34]9-9, L = [PW9O34]9-9
Travis M Anderson1, Wade A Neiwert, Martin L Kirk
1Department of Chemistry, Emory University, Atlanta, GA 30322, USA.
Science (New York, N.Y.)
|November 27, 2004
Resumen
Los investigadores sintetizaron un compuesto de platino ((IV) -oxo estable, desafiando las suposiciones anteriores sobre la inestabilidad de tales complejos de metal-oxo. Este avance abre nuevas vías en la química inorgánica y la ciencia de los materiales.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- Coordinación Química de la Coordinación
Sus antecedentes:
- Los complejos mono-oxo terminales de metales de transición tardía fueron históricamente considerados demasiado inestables para su síntesis.
- Se pensaba que la repulsión de electrones entre los orbitales d de oxígeno y metal impedía su formación.
Objetivo del estudio:
- Para sintetizar y caracterizar un compuesto de platino ((IV) - oxo terminal estable.
- Investigar los factores que contribuyen a la estabilidad de tales complejos.
Principales métodos:
- Síntesis y aislamiento de un compuesto de platino ((IV) -oxo con ligandos de polytungstate.
- Difracción de rayos X y neutrones a bajas temperaturas (30 K).
- Cálculos de la teoría funcional de la densidad (DFT) y análisis espectroscópico.
Principales resultados:
- Aislamiento de cristales marrones estables al aire de K7Na9[O=Pt(H2O) L2] a temperatura ambiente.
- Determinación de un enlace corto Pt-O (1.720(18) Å) por difracción, confirmando una especie terminal oxo, no hidroxo.
- Los datos DFT y espectroscópicos explicaron la estabilidad a través de la retirada de electrones en ligandos de estado polytung.
Conclusiones:
- Se logra la síntesis de un complejo de platino ((IV) -oxo estable, lo que contradice las predicciones previas de inestabilidad.
- La deslocalización de electrones en ligandos de estado polytung es clave para estabilizar la unidad Pt(IV) -oxo.
- Este trabajo amplía los conocidos complejos estables de metal-oxó y sus posibilidades sintéticas.
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