Influence of substituent effect phenanthroline on the structure of lanthanides complexes

Numakura, Masahiko; Yaita, Tsuyoshi; Shiwaku, Hideaki   ; Kobayashi, Toru ; Okamoto, Yoshihiro  ; Suzuki, Shinichi; Ikeda, Atsushi*  

Influences of thee different phenanthorolines (Phens) with which substituent differs, i.e., Phen, Methyl-Phen:MPhen, and Nitro-Phen:NPhen, on their structure and electronic structure formation were studied by EXAFS and XPS methods. The radial structural functions of EXAFS suggested that Lu ion forms 1:3, 1:2, and 1:1 complexes in metal to Phen ratios with Phen, MPhen, and NPhen, respectively. Moreover, the process of which Phen nitrogen with a small backscattering factor exchanges with chloride ion with a large one was clearly observed in the radial structural function of EXAFS. XPS spectra did not show any difference in both the valence level and inner-shell structures among the spectra for three Phens, while clear differences on the spectra of valence level between light lanthanide and heavy lanthanide complexes were observed.