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Hélices, quiralidad e interpenetración: la versatilidad y la notable interconversión de las estructuras de cianuro de
Ann M Chippindale1, Simon J Hibble
1School of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6AD, United Kingdom. a.m.chippindale@rdg.ac.uk
Journal of the American Chemical Society
|August 18, 2009
Resumen
Se sintetizaron nuevos cianuros de cobre y plata de cesio con marcos tridimensionales. Estos materiales experimentan transformaciones únicas en estado sólido, revelando complejas dinámicas estructurales y redes de interpenetración en compuestos de cianuro de plata y cobre.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química del estado sólido.
- La cristalografía es una técnica de cristalografía.
Sus antecedentes:
- Los cianuros de cobre y plata de cesio son conocidos por sus diversos motivos estructurales.
- Comprender sus transformaciones es clave para diseñar nuevos materiales.
Objetivo del estudio:
- Para describir las transformaciones estructurales de los cianuros de cesio, plata y cobre.
- Para sintetizar y caracterizar nuevos cianuros de marco tridimensional.
Principales métodos:
- Síntesis hidrotermal de cristales únicos.
- Difracción de rayos X de un solo cristal.
- Transformaciones en estado sólido por deshidratación y calentamiento.
Principales resultados:
- Se sintetizaron tres nuevos cianuros de plata de cesio ((I) cobre ((I) con marcos tridimensionales: Cs ((3) Ag ((2) Cu ((3) CN ((8) (I), CsAgCu ((CN)) ((3) (II) y CsAgCu ((CN)) ((3).1/3H ((2) O (III).
- El compuesto (I) se transforma en (II) y (III) en solución.
- El hidrato (III) se deshidrata a (II) a 100°C; los polimorfos conocidos CsAg(2)Cu(CN)(4) se interconvierten a 180°C.
- Se observaron cadenas helicoidales de cianuro de cobre y redes de auto-/interpenetración.
Conclusiones:
- El estudio revela nuevas transformaciones estructurales en los cianuros de cesio, plata y cobre bajo condiciones modestas.
- Estas transformaciones ponen de relieve la naturaleza dinámica de las estructuras de metal-cianuro.
- Los hallazgos contribuyen a la comprensión de las relaciones estructura-propiedad en los polímeros de coordinación.
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