Impact of the 3d Electronic States of Cobalt and Manganese Phthalocyanines on the Electronic Structure at the Interface to Ag(111)

X-ray absorption (XAS) and photoemission (XPS) spectroscopy revealed a strong interaction at the interface between transition-metal Cobalt phthalocyanine (CoPc) and single-crystalline Ag(111) substrate. According the Co L-edge absorption spectra of ultrathin CoPc films, charge transfer between the metal 3d electrons and the underlying metallic substrate occurs. Less intense but comparable effects are also observed at the MnPc/Ag(111) interface for partially filled d levels of Mn. The nature of interacting orbitals is also discussed by means of resonant photoemission spectroscopy (ResPES) as well as in comparison with the CoPc/Au(100) interface studied previously.