Unique (3,12)-connected coordination polymers displaying high stability, large magnetocaloric effect and slow magnetic relaxation

Two unique 3D coordination polymers based on octahedral [Ln(6)] (Ln = Gd (1), Dy (2)) clusters as nodes were synthesized, exhibiting a novel (3, 12)-connected topology with the symbol of (4(20).6(26).8(20))(4(3))(4). The magnetic studies reveal that 1 shows a -Delta S-m = 46.6 J kg(-1) K-1, falling among the largest values known to date, and 2 displays slow magnetic relaxation behavior. Both 1 and 2 have high thermal and solvent stabilities.