Temperature Effect on the Selective Hydration of Sodium Ion in Nitrobenzene
Temperature Effect on the Selective Hydration of Sodium Ion in Nitrobenzene
复制标题
温度对硝基苯中钠离子选择性水合的影响
DOI：
10.2116/analsci.19.1375
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发表时间：
2003
影响因子：
1.6
通讯作者：
K. Akasaka
中科院分区：
文献类型：
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作者：
T. Osakai;A. Tokura;H. Ogawa;H. Hotta;M. Kawakami;K. Akasaka
研究了温度对二哌胺根离子存在下水分子与水中Na~+共萃制硝基苯的影响。用Karl Fischer方法测得，随着温度的升高(6-65℃)，与Na~+离子共萃取的水分子数(N)从3.1增加到5.2。这一观察结果显然与简单热力学的预期相矛盾，因为水合作用通常是一个在熵上不利的过程。此外，用~1H核磁共振实验证实了水与Na~+的缔合常数确实随温度的升高而减小。然而，另一方面，研究表明，Nb中的水的溶解度随着温度的升高而显著增加。我们的结论是，后一种效应盖过了前一种不利的熵效应，从而导致n值的净增加，正如观察到的那样。
The effect of the temperature on the co-extraction of water molecules with Na^+ from water to nitrobenzene (NB) in the presence of dipicrylaminate ion has been studied. The number ( n ) of water molecules co-extracted with a Na^+ ion, as measured by the Karl Fischer method, increased from 3.1 to 5.2 with increasing temperature (6–65°C). This observation is in apparent contradiction to the expectation from simple thermodynamics because hydration is generally an entropically unfavorable process. Additional ^1H NMR experiments for the selective hydration of Na^+ in deuterated NB have confirmed that the association constants of water with Na^+ indeed decrease with increasing temperature. On the other hand, however, it has been shown that water solubility into NB substantially increases with temperature. We conclude that the latter effect overwhelms the former unfavorable entropy effect, which results in a net increase of the n -value, as observed.
DOI：
10.1201/9780203908754
发表时间：
2001-01
期刊：
--
影响因子：
--
作者：
A. Volkov
通讯作者：
A. Volkov
离子水合吉布斯能的非玻恩理论
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
T. Osakai;W. Murakami;K. Eda;and M. Yamamoto
通讯作者：
and M. Yamamoto