[Gd (L) (H O) ](Tf N) was obtained from reaction of Gd O 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 kg at 1.8 K for a 0-7 T magnetic field change, and with a refrigerant capacity of 125.9 J kg , in the 1.8-50 K interval.
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