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The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
Published on: November 28, 2016
Na6ZnSn2, Na4.24K1.76(1)ZnSn2 y Na20Zn8Sn11: tres estructuras intermetálicas que contienen la unidad lineal
Sung-Jin Kim1, Florian Kraus, Thomas F Fässler
1Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
Journal of the American Chemical Society
|January 14, 2009
Resumen
Los nuevos compuestos de metales alcalinos Na6ZnSn2, Na4.24K1.76ZnSn2 y Na20Zn8Sn11 presentan aniones lineares {Sn-Zn-Sn}6 y nuevas capas icosaédricas {Zn7Sn5}. El análisis químico cuántico confirma el enlace Sn-Zn covalente.
Área de la Ciencia:
- Química del estado sólido.
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- La exploración de nuevos compuestos intermetálicos es crucial para comprender los enlaces químicos y descubrir nuevos materiales.
- Los compuestos de metales alcalinos con metales de post-transición ofrecen diversos motivos estructurales y propiedades electrónicas.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos compuestos intermetálicos de sodio, potasio, zinc y estaño.
- Para dilucidar las estructuras cristalinas y las características de unión de estos nuevos compuestos.
- Investigar la estructura electrónica y las propiedades magnéticas de los materiales sintetizados.
Principales métodos:
- Fusión directa de los precursores elementales.
- Difracción de rayos X monocristalino para la determinación estructural.
- Cálculos químicos cuánticos (NBO, AIM, ELF, DFT/LMTO) para el análisis del enlace.
- Mediciones de la susceptibilidad magnética.
Principales resultados:
- Se han sintetizado tres nuevos compuestos intermetálicos, Na6ZnSn2 (1), Na4.24K1.76ZnSn2 (2) y Na20Zn8Sn11 (3).
- Todos los compuestos exhiben nuevos tipos de estructura, con {Sn-Zn-Sn} 6-aniones lineales con enlaces cortos Zn-Sn y el compuesto 3 que contiene {Zn7Sn5} capas icosaédricas.
- Los análisis químicos cuánticos confirman la unión covalente entre los átomos de estaño y zinc, con los contactos Na-Sn también desempeñando un papel en el compuesto 1, que exhibe un diamagnetismo débil.
Conclusiones:
- Los compuestos sintetizados representan nuevos tipos estructurales en la química de metales alcalinos y pnictidos.
- La presencia de {Sn-Zn-Sn} 6- aniones lineales y {Zn7Sn5} icosaedros pone de relieve los arreglos de enlace únicos.
- El estudio proporciona información sobre la interacción del enlace covalente y iónico en estas complejas fases intermetálicas.
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