%0 Generic %A Zheng, Yan-Zhen %A Evangelisti, Marco %A Tuna, Floriana %A E. P. Winpenny, Richard %D 2016 %T Co–Ln Mixed-Metal Phosphonate Grids and Cages as Molecular Magnetic Refrigerants %U https://acs.figshare.com/articles/dataset/Co_Ln_Mixed_Metal_Phosphonate_Grids_and_Cages_as_Molecular_Magnetic_Refrigerants/2558458 %R 10.1021/ja208367k.s017 %2 https://acs.figshare.com/ndownloader/files/4201534 %K Co 8Ln families %K Co 6Ln %K Co 4Ln families %K 7 T %K magnetocaloric effect %K 3 K %K Magnetic studies %K metal centers %K Co 4Ln %K RefrigerantsThe synthesis %K gadolinium derivatives %K Co 4Gd %K entropy changes %K kg %K MCE %K Co 8Ln family %K Co 6Gd %X The synthesis, structures, and magnetic properties of six families of cobalt–lanthanide mixed-metal phosphonate complexes are reported in this Article. These six families can be divided into two structural types: grids, where the metal centers lie in a single plane, and cages. The grids include [4 × 3] {Co8Ln4}, [3 × 3] {Co4Ln6}, and [2 × 2] {Co4Ln2} families and a [4 × 4] {Co8Ln8} family where the central 2 × 2 square is rotated with respect to the external square. The cages include {Co6Ln8} and {Co8Ln2} families. Magnetic studies have been performed for these compounds, and for each family, the maximum magnetocaloric effect (MCE) has been observed for the Ln = Gd derivative, with a smaller MCE for the compounds containing magnetically anisotropic 4f-ions. The resulting entropy changes of the gadolinium derivatives are (for 3 K and 7 T) 11.8 J kg–1 K–1 for {Co8Gd2}; 20.0 J kg–1 K–1 for {Co4Gd2}; 21.1 J kg–1 K–1 for {Co8Gd4}; 21.4 J kg–1 K–1 for {Co8Gd8}; 23.6 J kg–1 K–1 for {Co4Gd6}; and 28.6 J kg–1 K–1 for {Co6Gd8}, from which we can see these values are proportional to the percentage of the gadolinium in the core. %I ACS Publications