Three Gd‐Based Metal‐Organic Frameworks Constructed from Similar Dicarboxylate Ligands with Large Magnetic Entropy Changes

Three Gd‐based metal‐organic frameworks with the formulas of {[Gd 2 (suc) 3 (H 2 O) 2 ]⋅H 2 O} ∞ ( 1 ), {[Gd 2 (fum) 3 (H 2 O) 4 ]⋅2H 2 O} ∞ ( 2 ) and [Gd(glu)(ox) 0.5 (H 2 O) 2 ] ∞ ( 3 ) (suc=succinate, fum=fumarate, glu=glutarate and ox=oxalate) have been hydro/solvothermally synthesized through the reaction of Gd 2 O 3 and dicarboxylate ligands. Complexes 1 and 2 take three‐dimensional (3D) structures derived from carboxylate‐bridged chains, while complex 3 presents a Zigzag chain‐based two‐dimensional (2D) structure. All of them exhibit relatively good thermal stabilities. Magnetic investigations indicate that complexes 1 − 3 reveal weak magnetic interactions between the neighbouring Gd III ions. Moreover, they display large magnetic entropy changes with −Δ S m max reaching 42.22 J kg −1 K −1 ( 1 ), 37.97 J kg −1 K −1 ( 2 ) and 39.15 J kg −1 K −1 ( 3 ) with Δ H =7 T, respectively, indicating that they are promising cryogenic magnetorefrigerants.