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Cuento de tres nitruros moleculares: nitruros mononucleares de vanadio (V) y (IV) así como un nitruro de trivanadio
Mehrafshan G Jafari1, Dominik Fehn2, Anders Reinholdt1
1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
Journal of the American Chemical Society
|June 2, 2022
Resumen
Este estudio detalla la síntesis y caracterización de nuevos complejos de nitruro de vanadio y azido. Los investigadores exploraron nuevas vías para crear compuestos únicos de vanadio con diversos estados y estructuras de oxidación.
Área de la Ciencia:
- Química organometálica
- Síntesis inorgánica
- Química de coordinación
Sus antecedentes:
- Los complejos de vanadio son cruciales en la catálisis y la ciencia de los materiales.
- La comprensión de la reactividad de los azidos y nitritos de vanadio es clave para el desarrollo de nuevas metodologías sintéticas.
- El ligando hidro-tris ((pyrazolyl) borate (Tp*) proporciona un entorno de coordinación estable para el vanadio.
Objetivo del estudio:
- Sintetizar y caracterizar nuevos complejos de nitruro de vanadio y azido.
- Investigar la reactividad de los complejos de vanadio con fuentes de azido.
- Explorar las propiedades electrónicas y estructurales de estos nuevos compuestos de vanadio.
Principales métodos:
- Reacciones de transmetalización para formar complejos iniciales de vanadio.
- Reacciones de reducción y sustitución de azidas para generar diversas especies de vanadio.
- Espectroscopia de resonancia paramagnética de electrones (EPR) para la caracterización de los complejos paramagnéticos de vanadio.
- Aislamiento y determinación estructural de los principales productos intermedios y finales.
Principales resultados:
- Síntesis de los complejos V (III) y V (II), [Tp*) VCl2] y [Tp*) VCl.
- Formación del complejo nitruro-azido V (Tp*) VN (N3) y del intermediario azido V (III) [Tp*) VCl (N3) ].
- Aislamiento de un nitruro de vanadio tri-nuclear de valencia mixta, [{(Tp*) V}2(μ4-VN4) ], y un dimero V(II) con puente de azido, [{(Tp*) V}2(1,3-μ2-N3) ].
- Caracterización de los primeros aductos mononucleares de nitruro V (IV), [Tp*) VN (THF) ] y [Tp*) VN (OPPh3).
Conclusiones:
- El estudio sintetizó y caracterizó con éxito una serie de nuevos complejos de nitruro de vanadio y azido.
- Se establecieron nuevas rutas sintéticas para acceder a compuestos de vanadio con varios estados de oxidación y nuclealidades.
- El aislamiento de los aductos de nitruro de vanadio mononuclear representa un avance significativo en la química del nitruro de vanadio.
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