A {Gd12Na6} Molecular Quadruple-Wheel with a Record Magnetocaloric Effect at Low Magnetic Fields and Temperatures

• DOI: 10.1021/jacs.3c01610
• Publication Date: 2023-04-03T13:08:19Z
• Authors: Thomais G. Tziotzi; David Gracia; Scott J. Dalgarno; Jürgen Schnack; Marco Evangelisti; Euan K. Brechin; Constantinos J. M...
• Keywords: Magnetic refrigeration

Reaction of Gd(OAc)3·4H2O, salicylaldehyde and CH3ONa in MeCN/MeOH affords [Gd12Na6(OAc)25(HCO2)5(CO3)6(H2O)12]·9H2O.0.5MeCN (1·9H2O.0.5MeCN), whose structure describes a quadruple-wheel consisting two {Na3} {Gd6} rings. The magnetic properties 1 reveal very weak antiferromagnetic interactions between the GdIII ions, which give rise to record magnetocaloric effect at low applied fields temperatures. entropy change reaches -ΔSm= 29.3 J kg-1 K-1 for full demagnetization from B = T 0.5 K.