Magnetic Properties of 3D Heptanuclear Lanthanide Frameworks Supported by Mixed Ligands

Two 3D lanthanide frameworks, [Ln7(DPA)5(NA)3(μ3-OH)8(H2O)3]·2.5H2O [H2DPA = diphenic acid; HNA = nicotinic acid; Ln = Gd (1), Dy (2)], were synthesized and structurally
characterized. They were rarely seen examples of 3D frameworks constructed
from heptanuclear trigonal-antiprismatic lanthanide clusters with
mixed H2DPA and HNA ligands. Both 1 and 2 show typical antiferromagnetic interactions. Additionally,
complex 1 possesses a large magnetocaloric effect of
34.15 J kg–1 K–1.