The elucidation of chemical bond and structural properties of actinides and lanthanides with neutral N-donor molecules is key information for design for a new ion recognition reagent between trivalent actinides and lanthanides. Especially, it is important to note participation of generally-localized 5f electron into chemical bond across the filled 6s and 6p orbitals. The possibility that the covalent interaction is contributed by the 5f electrons was suggested by the DFT calculation methods while the studies dealing with this phenomenon based on the experiment are not still necessarily sufficient. On these backgrounds, we studied the electronic structural features of N-donor complexes with actinides: U, Pu, Am, Cm, Cf and lanthanides through the excitation and emission spectroscopies, and furthermore performed structural studies of uranium and lanthanide-N-donor complexes based on the X-ray crystallography and EXAFS methods. The N-donor ligands used in this study were pyridine amide (PDA), benzimidazole (BIZ), 1,10-phenanthroline (Phen), benzimidazole amide, and phenanthroline amide (PTA) . In this talk, we will discuss about the relationship between spectroscopic features and coordination properties, e.g., coordination polyhedron, chemical bond properties, bond distances.

Characterization of actinide and lanthanide-N-donor ligand complexes by various kinds of spectroscopic methods

245th National Meeting (2013)

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