Local 3d Electronic Structures of Co-Based Complexes with Medicinal   Molecules Probed by Soft X-Ray Absorption
  We have examined the local 3d electronic structures of Co-Au multinuclear complexes with the medicinal molecules D-penicillaminate (D-pen) [Co{Au(PPh3)(D-pen)}2]ClO4 and [Co3{Au3(tdme)(D-pen)3}2] by Co L_2,3-edge soft X-ray absorption (XAS) spectroscopy, where PPh3 denotes triphenylphosphine and tdme stands for 1,1,1-tris[(diphenylphosphino)methyl]ethane. The Co L_2,3-edge XAS spectra indicate the localized ionic 3d electronic states in both materials. The experimental spectra are well explained by spectral simulation for a localized Co ion under ligand fields with the full multiplet theory, which verifies that the ions are in the low-spin Co3+ state in the former compound and in the high-spin Co2+ state in the latter. 
Kohei Yamagami, Hidenori Fujiwara, Shin Imada, Toshiharu Kadono,   Keisuke Yamanaka, Takayuki Muro, Arata Tanaka, Takuma Ita...
cond-mat.mtrl-sci cond-mat.str-el physics.chem-ph