Hydroxo-Lanthanide Cluster Organic Framework Built by Hexanuclear Cluster Units

A novel hydroxo-lanthanide cluster organic framework, Sm3L8(mu (3)-OH)(H2O)center dot H2O (1), derived from the 4-pyridin-4-ylbenzoic acid (HL) has been hydrothermally made and structurally characterized by single crystal X-ray diffraction. Structure analysis shows the hexanuclear Sm-6 cluster unit is composed of inorganic tetranuclear hydroxo [Sm-4(OH)(2)](10+) (Sm-4) cluster and dimeric [Sm-2(COO)(4)](2+) (Sm-2) core. The Sm-6 cluster units are connected by L ligands to form a 2D Ln-based cluster organic framework. From the topological point of view, the layer architecture can be described as 4-connected sql net. Furthermore, the elemental analysis, PXRD, IR and TGA are also studied.