“…Whether this N atom also participates in the coordination with Eu 3+ is worth an in-depth investigation. It is well known that XPS can provide some information about the interaction between metal ion and donor atoms such N and O. , Thus, an XPS analysis was performed for further studying the complexation behavior of DAMIA ligand with the extracted metal ions. Figure a shows the XPS spectra of N 1s for the pure L III ligand and the L III -Eu extracted complex.…”