  Potassium (K) intercalated manganese phthalocyanine (MnPc) reveals vast
changes of its electronic states close to the Fermi level. However, theoretical
studies are controversial regarding the electronic configuration. Here, MnPc
doped with K was studied by ultraviolet, X-ray, and inverse photoemission, as
well as near edge X-ray absorption fine structure spectroscopy. Upon K
intercalation the Fermi level shifts toward the lowest unoccupied molecular
orbital filling it up with donated electrons with the appearance of an
additional feature in the energy region of the occupied states. The electronic
bands are pinned 0.5 eV above and 0.4 eV below the Fermi level. The branching
ratio of the Mn L3 and L2 edges indicate an increase of the spin state.
Moreover, the evolution of the Mn L and N K edges reveals strong hybridization
between Mn 3d and N 2p states of MnPc and sheds light on the electron
occupation in the ground and n-doped configurations.
