The unoccupied electronic structure of the semi-conducting room temperature molecular magnet V(TCNE)2

The unoccupied electronic structure of the organic-based magnet V(TCNE)x (TCNE = tetracyanoethylene, x~2) has been studied with near edge x-ray absorption fine structure (NEXAFS) and with photoelectron spectroscopy (PES). By studying V(TCNE)x upon sodiumdoping, the electron-accepting state, i.e. the lowest unoccupied molecular orbital (LUMO) of V(TCNE)x was shown mainly to be localized on (TCNE)-units in contrast to the holeaccepting state, i.e. the highest occupied molecular orbital (HOMO), which previously was assigned primarily to be V(3d)-derived. This study also showed that there are trap states for electron transport located below the (TCNE) level, likely leading to decreased electron mobility. *Correspondence author: Elin Carlegrim, Department of Science and Technology (ITN), Linköping University, S-601 74 Norrköping, Sweden. Fax nr: +46 11-363270 E-mail address: [email protected]