Lanthanide and Actinide-Centered Polyoxo-Noble-Metalate-Based Metal-Organic Frameworks

This paper reports the synthesis and the characterization of the first Ce^III-centered polyoxopalladate-based metal-organic framework (POP-MOF), Ce-JUB-1, and the first actinide-centered POP-MOF, Th-JUB-1, along with lanthanide-centered POP-MOFs, Ln-JUB-1 (Ln^III = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu). The compounds have been characterized by various solid-state techniques, such as single-crystal and powder X-ray diffraction, IR spectroscopy, and XPS spectroscopy. In addition, the oxidation state of the central cerium ion in Ce-JUB-1 as well as the nature of its redox behavior have been ascertained using detailed electrochemical studies, which exhibit a quasi-reversible oxidation process without indicating any degradation of the compound. The discovery of an actinide-centered POP-MOF, Th-JUB-1, is important as it opens up avenues for the use of POPs as radiopharmaceutical agents.