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Hydration and ion association of La3+ and Eu3+ salts in aqueous solution†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1039/c8cp00248g Sergej Friesen 1, 2, 3, 4 , Sebastian Krickl 1, 2, 3, 4 , Magdalena Luger 1, 2, 3, 4 , Andreas Nazet 1, 2, 3, 4 , Glenn Hefter 5, 6, 7, 8 , Richard Buchner 1, 2, 3, 4
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1039/c8cp00248g Sergej Friesen 1, 2, 3, 4 , Sebastian Krickl 1, 2, 3, 4 , Magdalena Luger 1, 2, 3, 4 , Andreas Nazet 1, 2, 3, 4 , Glenn Hefter 5, 6, 7, 8 , Richard Buchner 1, 2, 3, 4
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Aqueous solutions of five lanthanide salts: LaCl3, La(NO3)3, La2(SO4)3, Eu(NO3)3 and Eu2(SO4)3 have been studied at 25 °C by dielectric relaxation spectroscopy over the frequency range 0.05 ≤ ν/GHz ≤ 89. Detailed analysis of the solvent-related modes located at higher frequencies showed that both La3+ and Eu3+ are strongly hydrated, even including partial formation of a third hydration shell similar to that of Al3+(aq). Up to two solute-related modes could be detected at lower frequencies, due to the formation of various types of 1 : 1 ion pairs (IPs). All five salts showed modest levels of association in the order Cl− < NO3− ≪ SO42−, mostly in the form of double-solvent-separated IPs with small amounts of solvent-shared IPs. Overall association constants, 
, calculated from the stepwise IP formation constants were consistent with literature values.
中文翻译：
La 3+和Eu 3+盐在水溶液中的水合和离子缔合†
通过介电弛豫光谱法研究了五种镧系元素盐的水溶液：LaCl 3，La（NO 3）3，La 2（SO 4）3，Eu（NO 3）3和Eu 2（SO 4）3。在0.05≤ν / GHz≤89的频率范围内。对较高频率下与溶剂相关的模式的详细分析表明，La 3+和Eu 3+均被强烈水合，甚至包括与第三部分相似的第三水合壳的形成。铝3+（aq）。由于形成了各种类型的1：1离子对（IP），因此在较低的频率下最多可以检测到两种与溶质有关的模式。所有五个盐显示该顺序氯关联的适度水平- <NO 3 - «SO 4 2-，大多是在与少量溶剂共享IP地址的双溶剂分离的IP的形式。从逐步形成IP的常数计算出的总缔合常数与文献值一致。
更新日期：2018-03-08
, calculated from the stepwise IP formation constants were consistent with literature values.
中文翻译：
La 3+和Eu 3+盐在水溶液中的水合和离子缔合†
通过介电弛豫光谱法研究了五种镧系元素盐的水溶液：LaCl 3，La（NO 3）3，La 2（SO 4）3，Eu（NO 3）3和Eu 2（SO 4）3。在0.05≤ν / GHz≤89的频率范围内。对较高频率下与溶剂相关的模式的详细分析表明，La 3+和Eu 3+均被强烈水合，甚至包括与第三部分相似的第三水合壳的形成。铝3+（aq）。由于形成了各种类型的1：1离子对（IP），因此在较低的频率下最多可以检测到两种与溶质有关的模式。所有五个盐显示该顺序氯关联的适度水平- <NO 3 - «SO 4 2-，大多是在与少量溶剂共享IP地址的双溶剂分离的IP的形式。
从逐步形成IP的常数计算出的总缔合常数与文献值一致。
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