Mapping Hydration Water around Alcohol Chains by THz Calorimetry.

Mapping Hydration Water around Alcohol Chains by THz Calorimetry.
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DOI:
10.1002/anie.201612162
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发表时间:
2017-08-07
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Havenith M
Havenith M
中科院分区:
其他
文献类型:
--
作者:
Böhm F;Schwaab G;Havenith M

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太赫兹光谱被用来探测醇链溶剂化时氢键网络动力学发生的变化。太赫兹光谱可以分解为体相水、四面体水和更无序(或间隙)的水化水的光谱。四面体有序的水合水在195 cm−1处有一个带,位于醇的疏水部分周围。 间隙组分在164 cm−1处产生一个谱带,与第一水化壳层中的水化水有关。 溶剂化醇链的低频光谱中的这些温度依赖性变化可以与溶剂化时的热容、熵和自由能的变化相关。令人惊讶的是,不是四面体有序的组分,而是间隙水合水被发现主要负责ΔCp和ΔG的温度依赖性变化。自由能中的溶质特定偏移归因于空隙形成并且与链长成线性比例。
THz spectroscopy was used to probe changes that occur in the dynamics of the hydrogen bond network upon solvation of alcohol chains. The THz spectra can be decomposed into the spectrum of bulk water, tetrahedral hydration water, and more disordered (or interstitial) hydration water. The tetrahedrally ordered hydration water exhibits a band at 195 cm−1 and is localized around the hydrophobic moiety of the alcohol. The interstitial component yields a band at 164 cm−1 which is associated with hydration water in the first hydration shell. These temperature‐dependent changes in the low‐frequency spectrum of solvated alcohol chains can be correlated with changes of heat capacity, entropy, and free energy upon solvation. Surprisingly, not the tetrahedrally ordered component but the interstitial hydration water is found to be mainly responsible for the temperature‐dependent change in ΔCp and ΔG. The solute‐specific offset in free energy is attributed to void formation and scales linearly with the chain length.
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