Journal
CHEMPHYSCHEM
Volume 23, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.202200213
Keywords
ionic liquids; molecular glasses; magnetocaloric effect; molecular magnets; gadolinium complexes
Funding
- European Union [746060]
- Labex NIE (Investissement dAvenir program) [ANR-11-LABX-0058_NIE, ANR-10-IDEX-0002-02]
- Marie Curie Actions (MSCA) [746060] Funding Source: Marie Curie Actions (MSCA)
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[Gd-5(L)(16)(H2O)(8)](Tf2N)(15) obtained from the reaction was found to be a frozen organic glass liquid with weak magnetic intramolecular interactions, exhibiting a magnetocaloric effect.
[Gd-5(L)(16)(H2O)(8)](Tf2N)(15) was obtained from reaction of Gd2O3 with 1-carboxymethyl-3-ethylimidazolium chloride (LHCl). The material was found to be an ionic liquid that freezes to glassy state on cooling to -30 degrees C. Variable-temperature magnetic studies reveal the presence of weak magnetic intramolecular interactions in the glass. Isothermal variable-field magnetization demonstrates a magnetocaloric effect (MCE), which is the first finding of such an effect in a molecular glass. This MCE is explainable by an uncoupled representation, with a magnetic entropy change of -11.36 J K-1 kg(-1) at 1.8 K for a 0-7 T magnetic field change, and with a refrigerant capacity of 125.9 J kg(-1), in the 1.8-50 K interval.
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