Abstract

Two series of Ln–MnII heterometallic coordination polymers (HCPs), [Ln8Mn3(µ3‐OH)8(IN)14Cl6(H2O)16]n(OH)2n·5nDMF·8nH2O {Ln = Gd (1); Ln = Dy (2)} and [Ln2Mn(IN)6Cl2(H2O)4]n·2nDMF {Ln = Gd (3); Ln = Dy (4), IN = isonicotinic cation}, were synthesized by using fractional crystallization and structurally characterized. Polymers 1 and 2 are isostructural and form a 2D double layer of [Ln4(µ3‐OH)4] cubane and Mn(IN)4Cl2 units, whereas 3 and 4 are isomorphic and form a four‐connected cds‐type 3D framework assembled from paddle‐wheel binuclear Ln2(COO)4 units and planar Mn(IN)4Cl2 units. Polymers 1–4 exhibited large magnetic entropy changes of 42.0, 16.7, 31.5, and 16.6 J kg–1 K–1, respectively (ΔH = 7 T). In addition, compounds 2 and 4 displayed field‐induced slow magnetic relaxation behavior.

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