Slow-to-fast transition of hydrogen bond dynamics in acetamide hydration shell formation
Literature Information
Francesco D'Amico, Gaia Camisasca, Filippo Bencivenga, Alessandro Gessini, Emiliano Principi, Riccardo Cucini, Claudio Masciovecchio
The formation of a hydration shell in acetamide aqueous solution has been investigated by means of UV Raman spectroscopy. The experimental results reveal the existence of two distinct regimes of water dynamics. At high acetamide concentration water molecules show a structural and dynamical behavior consistent with the so-called iceberg model. Upon increasing the amount of water we observe the formation of a hydration shell marked by fastening of hydrogen-bond dynamics. Such a behavior may help to shed light on the scientific debate on how water rearranges around the hydrophobic portions of solute molecules (iceberg vs. non-iceberg models).
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