Cl - -templated coordination polymers constructed from dragonfly-like Ln 4 clusters exhibiting excellent magnetothermal properties.

Lanthanide clusters with high magnetic entropy and an exquisite structure have always been a hot research direction. Herein, two delicately structured lanthanide clusters were synthesized using isonicotinic acid (HIN) as a ligand by the solvothermal method, namely {[Gd 4 (IN) 4 (μ 3 -OH) 4 (OAc) 2 (H 2 O) 6 ]·Cl 2 ·7H 2 O} n (1) and {[Dy 4 (IN) 4 (μ 3 -OH) 4 (OAc) 2 (H 2 O) 6 ]·Cl 2 ·8H 2 O} n (2). Structural analysis indicates that the two compounds exhibit comparable structures, and both have the same cubane-like Ln4 metal skeleton and form an interesting dragonfly molecular configuration by connecting to HIN. Moreover, {Ln4} serves as the fundamental structural unit for the construction of a 1D channel of 1, with a diameter of approximately 10.08 Å, which is connected to each other by extra {Ln4} units to form an exquisite porous 3D structure of 1. Cl - exists as an anion-template in its 3D structure, balancing the charge and maintaining its structural stability. Magnetic measurements indicate that 1 exhibits a rather satisfactory magnetic entropy change, reaching a maximum value of -Δ S maxm = 31.59 J kg -1 K -1 at 2 K for Δ H = 7 T.