Kartal S, Rogez G, Robert J, Heinrich B, Boudalis A. A magnetocaloric glass from an ionic-liquid gadolinium complex.
Chemphyschem 2022;
23:e202200213. [PMID:
35441760 DOI:
10.1002/cphc.202200213]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/08/2022] [Indexed: 11/09/2022]
Abstract
[Gd 5 (L) 16 (H 2 O) 8 ](Tf 2 N) 15 was obtained from reaction of Gd 2 O 3 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 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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