ChemPhysChem & Cover Feature [POMAM]

Abstract:

Gd₅(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 °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.

Graphical Abstract :

A Gd^III-based ionic liquid exhibits a magnetocaloric effect in a frozen glass state.

 

Reference :

Seda Kartal, Dr. Guillaume Rogez, Dr. Jérôme Robert, Dr. Benoît Heinrich, Dr. Athanassios K. Boudalis

A Magnetocaloric Glass from an Ionic-Liquid Gadolinium Complex

ChemPhysChem, First published: 20 April 2022 – DOI: https://doi.org/10.1002/cphc.202200213

 

Cover Feature :

A Magnetocaloric Glass from an Ionic-Liquid Gadolinium Complex (ChemPhysChem 12/2022) – DOI: https://doi.org/10.1002/cphc.202200356

 

 

Contact :

Athanassios K. Boudalis, équipe Propriétés Optiques et Magnétiques des Architectures Moléculaires (POMAM), Institut de Chimie (UMR 7177).