Delayed Onset of Crystallinity in Ion-Containing Aqueous Nanodrops.
J Am Chem Soc
; 138(1): 96-9, 2016 Jan 13.
Article
en En
| MEDLINE
| ID: mdl-26714195
ABSTRACT
Water exhibits remarkable properties in confined spaces, such as nanometer-sized droplets where hundreds of water molecules are required for crystalline structure to form at low temperature due to surface effects. Here, we investigate how a single ion affects the crystallization of (H2O)n clusters with infrared photodissociation spectroscopy of size-selected La(3+)(H2O)n nanodrops containing up to 550 water molecules. Crystallization in the ion-containing nanodrops occurs at n ≥ 375, which is approximately 100 more water molecules than what has been reported for neutral water clusters. This frustration of crystallinity reveals that La(3+) disrupts the hydrogen-bonding network of water molecules located remotely from the ion, a conclusion that is supported by molecular dynamics simulations. Our findings establish that a trivalent ion can pattern the H-bond network of water molecules beyond the third solvation shell, or to a distance of â¼1 nm from the ion.
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Banco de datos:
MEDLINE
Idioma:
En
Revista:
J Am Chem Soc
Año:
2016
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Article
País de afiliación:
Estados Unidos