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Issue 13, 2018
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Hydration and ion association of La3+ and Eu3+ salts in aqueous solution

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Abstract

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, Image ID:c8cp00248g-t1.gif, calculated from the stepwise IP formation constants were consistent with literature values.

Graphical abstract: Hydration and ion association of La3+ and Eu3+ salts in aqueous solution

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Publication details

The article was received on 12 Jan 2018, accepted on 08 Mar 2018 and first published on 08 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP00248G
Citation: Phys. Chem. Chem. Phys., 2018,20, 8812-8821
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    Hydration and ion association of La3+ and Eu3+ salts in aqueous solution

    S. Friesen, S. Krickl, M. Luger, A. Nazet, G. Hefter and R. Buchner, Phys. Chem. Chem. Phys., 2018, 20, 8812
    DOI: 10.1039/C8CP00248G

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