Water-like Behavior of Formamide: Jump Reorientation Probed by Extended Depolarized Light Scattering,The Journal of Physical Chemistry Letters

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Water-like Behavior of Formamide: Jump Reorientation Probed by Extended Depolarized Light Scattering
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-12-15 00:00:00 , DOI: 10.1021/acs.jpclett.7b02943
S. Perticaroli ₁ , L. Comez , P. Sassi , A. Morresi , D. Fioretto , M. Paolantoni

Affiliation

Water is a strong self-associated liquid with peculiar properties that crucially depend on H-bonding. As regards its molecular dynamics, only recently has water reorientation been successfully described based on a jump mechanism, which is responsible for the overall H-bonding exchange. Here, using high-resolution broad-band depolarized light scattering, we have investigated the reorientational dynamics of formamide (FA) as a function of concentration from the neat liquid to diluted aqueous solutions. Our main findings indicate that in the diluted regime the water rearrangement can trigger the motion of FA solute molecules, which are forced to reorient at the same rate as water. This highlights an exceptional behavior of FA, which perfectly substitutes water within its network. Besides other fundamental implications connected with the relevance of FA, its water-like behavior provides rare experimental evidence of a solute whose dynamics is completely slaved to the solvent.

中文翻译：

甲酰胺的水样行为：通过扩展的去偏振光散射探测跃迁取向

水是一种强烈的自缔合液体，具有特殊的特性，而该特性主要取决于氢键。关于其分子动力学，直到最近才基于跳跃机制成功地描述了水的重新取向，该跳跃机制负责整个H键交换。在这里，我们使用高分辨率宽带去偏振光散射，研究了从纯净液体到稀释水溶液的甲酰胺（FA）随浓度变化的动态变化。我们的主要发现表明，在稀释状态下，水的重排可以触发FA溶质分子的运动，FA溶质分子被迫以与水相同的速率重新定向。这突出了FA的出色表现，它可以完美替代其网络中的水。

更新日期：2017-12-15

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