Synthesis and Characterization of a Cerium(IV) Coordination Polymer Containing Isonicotinic Acid Zwitterions
The synthesis and characterization of a new Ce(IV) coordination polymer (CP) of composition [Ce4O2(OH)2(NO3)2(C6H5NO2)8](NO3)8 (CeINA), employing isonicotinic acid (INA) as the ligand and ceric ammonium nitrate ((NH4)2[Ce(NO3)6], CAN) as the metal source, is reported. In CeINA the zwitterionic ligand (INA*) with a carboxylate and a pyridinium group is present. The structure of CeINA was solved from powder X-ray diffraction (PXRD) data and refined using the Rietveld method. The crystal structure of CeINA contains isolated chains of edge-sharing CeO8 polyhedra as the inorganic building unit (IBU), which are coordinated through the carboxylate groups of the zwitterionic INA* ligands to form a monoperiodic CP. Nitrate anions coordinate to the IBU as well, but are also located between the IBUs. The title compound was characterized by thermogravimetric and variable-temperature PXRD measurements, as well as elemental analysis, infrared, and X-ray absorption spectroscopy (XAS). Additionally, the formation of CeINA was studied in situ via PXRD and XAS. The initial oxidation state of +IV of Ce was maintained during the course of the reaction leading to CeINA.
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