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Ionic Liquids [M 3+ ][A − ] 3 with Three‐Valent Cations and Their Possible Use to Easily Separate Rare Earth Metals
Author(s) -
Rothe Manuel,
Tress Martin,
Allacher Carina,
Nuernberger Patrick,
Kunz Werner
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101925
Subject(s) - ionic liquid , chemistry , ionic bonding , melting point , inorganic chemistry , oxide , alkyl , ion , organic chemistry , catalysis
We introduce a simple way to liquify rare earth metals (REM) by incorporating the corresponding cations, in particular Eu 3+ , La 3+ , and Y 3+ , into polyvalent ionic liquids (ILs). In contrast to conventional methods, this is achieved not by transforming them into anionic complexes, but by keeping them as bare cations and combining them with convenient, cheap and commercially available anions (A) in the form [REM 3+ ][A − ] 3 . To do so, we follow the COncept of Melting Point Lowering due to EThoxylation (COMPLET) with alkyl polyethylene oxide carboxylates as anions. We provide basic properties, such as glass transition temperatures, viscosities, electrical conductivities, as well as water‐octanol partition constants P and show that these ILs have remarkably different properties, despite the similarity of their cations. In addition, we show that the ionic liquids possess interesting luminescent properties as non‐conventional fluorophores.