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Four two-dimensional heterometallic Cu–Ln coordination polymers based on the 2-methylenesuccinic acid (H2MSA) ligand, {[Ln2Cu(MSA)4(H2O)6]·2H2O}n(Ln = La (1); Gd (2); Tb (3); Dy (4)), have been obtained under hydrothermal conditions. Complexes 1–4 bear a feature of one-dimensional [Ln2Cu] chains linked by 2-methylenesuccinate (MSA2−) bridges to form a 2D layer structure. Magnetic studies suggest the presence of weak antiferromagnetic Gd…Gd coupling and weak ferromagnetic Cu…Gd coupling in the 1D [Gd2Cu] chain unit of 2. The magnetic entropy change (−ΔSm) reached 36.05(1) J K−1 kg−1 for 2, making it an attractive refrigerant for low-temperature applications. [ABSTRACT FROM AUTHOR]

One three-dimensional Gd(III) coordination polymer with 1,2-phenylenediacetate (PDA 2 − ), [Gd 2 (PDA) 3 (H 2 O) 2 ]·3H 2 O (1), has been successfully synthesized and characterized. Single crystal X-ray diffraction analysis shows that 1 consists of 1D wave Gd-based chain unit and PDA 2 − linker. Magnetic studies suggest the presence of ferromagnetic Gd ⋯ Gd coupling in the 1D chain unit of 1. Meanwhile, 1 has a significant cryogenic magnetocaloric effect with the maximum − ΔS m of 33.44 at 2 K and 7 T. [ABSTRACT FROM AUTHOR]

One 2D Gd(III)-based polymer with trans -aconitate ligand was synthesized solvothermally and displays a large cryogenic MCE with the maximum −ΔS m value of 35.89 J kg−1 K−1 at 2 K and Δ H =7 T. • The first Gd(III) polymer based on trans -aconitate ligand was prepared solvothermally. • The polymer owns a 2D layer structure with a metal skeleton of co-edge parallelogram. • The polymer displays a significant MCE of −Δ S m = 35.89 J kg−1 K−1. One two-dimensional Gd(III) coordination polymer based on trans -aconitic acid (H 3 ANA) ligand, [Gd(ANA)(DMF)(H 2 O) 2 ] n (1), was prepared solvothermally and characterized structurally. Single crystal X-ray diffraction analysis reveals that complex 1 crystallizes in monoclinic P 2 1 /c space group and possesses a 2D layer structure containing 3-connected Gd(III) ion and tridentate ANA3− ligand. The 2D structure owns a metal skeleton of co-edge parallelogram with the Gd⋯Gd distances of 8.36 (1) Å × 9.48 (1) Å. Magnetic studies demonstrate that 1 displays weak ferromagnetic interaction between the neighboring Gd(III) ions from the adjacent 2D layers, and has a large cryogenic magnetocaloric effect with the maximum − ΔS m value of 35.89 J kg−1 K−1 at 2 K and Δ H = 7 T. [ABSTRACT FROM AUTHOR]