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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Los efectos de los aniones de haluro disueltos en la unión de hidrógeno en el agua líquida
Jared D Smith1, Richard J Saykally, Phillip L Geissler
1Department of Chemistry, University of California, Berkeley, California 94720, USA.
Journal of the American Chemical Society
|October 26, 2007
Resumen
La adición de sales al agua no altera significativamente la red de enlaces de hidrógeno más allá de la primera capa de solvación. Los campos eléctricos iónicos, no los cambios estructurales, afectan al agua.
Área de la Ciencia:
- Química Física es la química física.
- Física Química Física Química es la física de la química.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los iones en soluciones acuosas a menudo se clasifican como "fabricantes de estructuras" o "ruptores de estructuras".
- Esta clasificación se basa en parte en los cambios observados en los espectros vibratorios del agua (Raman e IR).
- Se cree ampliamente que las sales alteran estructuralmente la red de enlaces de hidrógeno del agua.
Objetivo del estudio:
- Para investigar el verdadero impacto de las sales de halogenuros alcalinos en la red de enlaces de hidrógeno del agua líquida.
- Para determinar si los cambios espectrales observados se deben a alteraciones estructurales u otros factores.
Principales métodos:
- Mediciones experimentales de espectros vibratorios O-H en agua con haluros alcalinos.
- Simulaciones avanzadas por computadora para modelar las interacciones entre iones y agua y los espectros vibratorios.
- Comparación de datos experimentales con resultados de simulación para validar los hallazgos.
Principales resultados:
- Los cambios observados en los espectros vibratorios O-H son causados principalmente por los campos eléctricos de los iones.
- Estos efectos están localizados en las moléculas de agua directamente adyacentes a los iones (primera capa de solvación).
- Las estadísticas de la red de enlaces de hidrógeno más allá de la primera capa de solvación sólo se ven débilmente afectadas.
Conclusiones:
- Las clasificaciones tradicionales de "fabricante de estructuras" y "destructor de estructuras" pueden ser demasiado simplificadas.
- Los campos eléctricos de iones, no las modificaciones estructurales extensas, son los principales impulsores de los cambios espectrales.
- La red de enlaces de hidrógeno del agua es más robusta a la influencia iónica de lo que se pensaba anteriormente.
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