Synthesis and Characterization of a Holmium 2,2′-bipyridine-5,5′-dicarboxylate MOF: Towards the Construction of a Suitable Holmium Carrier

Based on the 2,2′-bipyridine-5,5′-dicarboxylic acid ligand (H₂bpdc), a new metal-organic framework using holmium as the coordinating metal site was synthesized through a solvothermal reaction. The 3D compound {[Ho₂(bPdc)₃(DMF)₂] · 2(DMF)}ₙ (1) was characterized by single crystal X-ray diffraction, FTIR, TGA and PXRD. The coordination between H₂bpdc, the solvent, and holmium (CN = 7) allows for the construction of a MOF containing potentially free metal sites and uncoordinated N-donor sites. These features make this MOF an attractive holmium carrier for radiotherapeutic applications.