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Transformación estructural del agua en las interfaces hidrofóbicas moleculares
Joel G Davis1, Kamil P Gierszal, Ping Wang
1Purdue University, Department of Chemistry, West Lafayette, Indiana 47907, USA.
Nature
|November 23, 2012
Resumen
La hidratación hidrofóbica es la hidratación
Área de la Ciencia:
- Interacciones agua-soluciones en agua.
- Química biofísica es la química biofísica.
- Física Química Física Química es el campo de la física química.
Sus antecedentes:
- La hidratación hidrofóbica es crucial para los procesos biológicos como el plegamiento de las proteínas.
- Históricamente, las cáscaras de hidratación fueron modeladas como hidratos de clatrato.
- Estudios recientes destacan la importancia de las escalas de longitud en la hidratación hidrofóbica.
Objetivo del estudio:
- Para investigar las propiedades estructurales y dinámicas de las conchas de hidratación hidrofóbicas.
- Para explorar la influencia de la temperatura y la longitud de la cadena en la estructura del agua alrededor de los solutos hidrofóbicos.
- Para mapear las características espectroscópicas vibratorias de las conchas de hidratación utilizando la dispersión de Raman.
Principales métodos:
- Es una combinación de dispersión de Raman polarizada, isotópica y dependiente de la temperatura.
- Análisis de la resolución multivariada de la curva (Raman-MCR). análisis.
- Estudio de los alcoholes lineales desde el metanol hasta el heptanol a través de 0-100 °C.
Principales resultados:
- A bajas temperaturas, las conchas de hidratación exhiben un orden de agua tetraédrico mejorado y menos enlaces débiles de hidrógeno en comparación con el agua a granel.
- Esta estructura ordenada disminuye con el aumento de la temperatura.
- Para las cadenas hidrofóbicas de más de ~1 nm, una estructura más desordenada con enlaces de hidrógeno más débiles emerge a temperaturas más altas.
Conclusiones:
- Los hallazgos apoyan el concepto de una transformación estructural del agua inducida térmicamente en la hidratación hidrofóbica.
- Las observaciones son consistentes con el fenómeno de cruce hidrofóbico predicho en escalas de longitud específicas (~ 1 nm).
- Este estudio proporciona información detallada sobre el comportamiento dependiente de la temperatura de la estructura del agua alrededor de las moléculas hidrofóbicas.
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