Synthesis and Characterization of Two Novel Lanthanide Coordination Polymers with an Open Framework Based on an Unprecedented [Ln₇(μ₃-OH)₈]¹³⁺ Cluster

Two novel heptanuclear lanthanide clusters of the dicubane-like type [Ln7(μ3-OH)8]13+ (Ln = Ho (1), Yb (2)) were obtained via hydrothermal reaction, and as building blocks, they were formally assembled into porous three-dimensional networks through the linkage of 1,4-naphthalenedicarboxylate (1,4-NDA), forming first examples of porous lanthanide polymers with 1,4-NDA, [Ln7(μ3-OH)8(1,4-NDA)6(OH)0.5(Ac)0.5(H2O)7]·4H2O (Ln = Ho, Yb). The coordinating water molecules and lattice water molecules are enclathrated in the cavities.