Two polymeric 36-metal pure lanthanide nanosize clusters

Two rarely seen 2D coordination polymers based on huge 36-metal pure lanthanide clusters, {[Gd-36(NA)(36)(OH)(49)(O)(6)(NO3)(6)(N-3)(3)(H2O)(20)]Cl-2 center dot 28H(2)O}(n) (1) and {[Dy-36(NA)(36)(OH)(49)(O)(6)(NO3)(6)(N-3)(3-)(H2O)(20)]Cl-2 center dot 28H(2)O}(n) (2) (HNA = nicotinic acid), were synthesized and structurally characterized. The spherical Ln(36) skeleton can be viewed as the aggregation of one cyclohexane chair-like Ln(24) wheel and two identical tripod-like Ln(6) units. The coordination of the carboxylic groups of the NA ligands with the Ln(III) cations results in a square layer. Additionally, compound 1 possesses a large MCE of 39.66 J kg(-1) K-1 and compound 2 exhibits slow relaxation of the magnetization.