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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 new three-dimensional Cd(II) polymer [Cd 3 (MMA) 2 (INA) 2 ] n ( 1 ) was synthesized hydrothermally based on mixed flexible methylmalonic acid (H 2 MMA) and rigid isonicotinic acid (HINA) ligands. Single-crystal X-ray diffraction analysis reveals that compound 1 has a 3D framework structure consisting of 2D {Cd 3 } layer unit and INA − connector, which bears a (3,8)-connected tfz-d topology with Schläfli symbol of {4 3 } 2 {4 6 .6 18 .8 4 }. The solid-state luminescent property was studied and 1 exhibits strong emission centered at 429 nm. [ABSTRACT FROM AUTHOR]