Abstract
Mixed-valence states of biferrocene derivatives having long alkyl chains such as ditetradecyl, dihexadecyl, and doctadecyl substituents were investigated. A little shortening in the inter-layer length by recrystallization from CH2Cl2 was observed in ditetradecyl and dihexadecyl derivatives, while no difference was observed in dioctadecyl derivative. Samples having a longer inter-layer length showed a temperature independent trapped-valence state. On the other hand, samples having a shorter inter-layer length showed a temperature dependence, in which two doublets observed at 80 K approach each other with an increase of temperature to converge into one doublet which is ascribed to an averaged-valence state. The results obtained in the present study prove the fact that the crystal structure affects the mixed-valence states.
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Nakashima, S., Sano, H. Mixed-valence states of biferrocene derivatives having long alkyl chains. Hyperfine Interact 53, 367–372 (1990). https://doi.org/10.1007/BF02101068
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DOI: https://doi.org/10.1007/BF02101068