A Magnetocaloric Glass from an Ionic‐Liquid Gadolinium Complex. Issue 12 (28th April 2022)

• Record Type: Journal Article
• Authors: Kartal, Seda; Rogez, Guillaume; Robert, Jérôme; Heinrich, Benoît; Boudalis, Athanassios K.
• Is Part Of: Chemphyschem. Volume 23:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-28
• Subjects: ionic liquids -- molecular glasses -- magnetocaloric effect -- molecular magnets -- gadolinium complexes; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.202200213
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: [Gd5 (L)16 (H2 O)8 ](Tf2 N)15 was obtained from reaction of Gd2 O3 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. Abstract : A Gd III ‐based ionic liquid exhibits a magnetocaloric effect in a frozen glass state.