Abstract
Mössbauer effect spectroscopy is one of the most important techniques for observing the dynamic phenomena of electronic states in solid. The Mössbauer spectra of mixed valence compounds show relaxation spectra if the electronic states are changed dynamically between Fe2+ and Fe3+. The dynamic electronic states of mixed valence compounds are discussed in connection with Mössbauer spectra of [Fe2 (bpmp) (ppa) 2]X2 as examples. The absorption spectra and cyclic voltammograms of the compounds were measured. The electronic states of the mixed compounds are dependent on the species of their anions in the solid state.
