[Untitled]
- Resource Type
- Authors
- M. Hillberg; R. Feyerherm; Oskar Nuyken; F. J. Litterst; W. Wagener; W. Stieler; T. Pöhlmann
- Source
- Journal of Physics: Condensed Matter. 6:L391-L398
- Subject
- chemistry.chemical_classification
Valence (chemistry)
Stereochemistry
Polymer
Condensed Matter Physics
Crystallography
chemistry.chemical_compound
chemistry
Ferrocene
Mixed valent
Mössbauer spectroscopy
General Materials Science
Hyperfine structure
Excitation
- Language
- ISSN
- 0953-8984
57Fe Mossbauer spectroscopy on several polymers containing ferrocene reveals two valence states of iron. In addition to the structure SI (the ferrocene unit) a second structure SII is detected which at low temperatures has hyperfine parameters identical to those of ferrocene (Fe(II)) but which undergoes a reversible transformation to Fe(III) with rising temperature. The excitation energy for the valence transformation is found to be about 1.5 meV, the valence fluctuation rate is slower than 10-6 s up to 300 K. We attribute the mixed valent species to cross links in the polymer consisting of two ferrocene units.