Moessbauer and ESR spectroscopic studies on the mixed-valence states of 1',1'"-bis(methylbenzyl)biferrocenium triiodides in crystalline and dispersed state.

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概要

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• Iron atoms in the two different crystal forms of 1′,1'″-dibutylbiferrocenium triiodide showed different temperature-depending mixed-valence states; i.e., an averaged-valence state at higher temperatures and a trapped-valence state at lower temperatures in one crystal form but only a trapped-valence state from 78 K to room temperature in the other crystal form. The temperature-depending mixed-valence states were observed in 1′,1'″-diisobutylbiferrocenium triiodide, whereas only a trapped-valence state was found in 1′,1'″-dipentylbiferrocenium triiodide. Both the 1′,1'″-dibutyl- and 1′,1'″-diisobutylbiferrocenium triiodide showed Mössbauer spectra that were different from those of their crystalline states in a dispersed state. A good correlation of the anisotropy of <I>g</I>-values with the mixed-valence states was observed in the ESR spectra for a series of 1′,1'″-dialkyl- and 1′,1'″-bis(methylbenzyl)biferrocenium triiodides. The difference in the ESR parameters between these compounds in the crystalline state was reduced in the dispersed state.

• 公益社団法人 日本化学会の論文

著者

• NAKASHIMA Satoru

  Department of Biotechnology, University of Tokyo

• Masuda Yuichi

  Department Of Chemistry Faculty Of Science Ochanomizu University

• Motoyama Izumi

  Department Of Applied Chemistry Faculty Of Engineering Kanagawa University

• SANO Hirotoshi

  Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

• Sano Hirotoshi

  Department of Chemistry Faculty of Science The University of Tokyo

• Sano Hirotoshi

  Deparment of Chemistry, Faculty of Science, Tokyo Metropolitan University

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