MÖSSBAUER SPECTROSCOPIC STUDY ON 1′-MONOHALOBIFERROCENES
In a series of 1′-monohalobiferrocenes, it has been found that their triiodide salts show a trapped valence state of iron atoms, although the monocations of 1′,1'″-diiodo- and dibromobiferrocene show an averaged valence state in the temperature range from 4.2 K to 298 K.