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- W2034001921 abstract "Abstract The physical properties of the new mixed-valence 1′,3:1‴,3″-bis(propane-1,3-diyl)-1,1″-biferrocenium triiodide ( 1 ) and 1′,3:1‴,3″-bis(pentane-l,5-diyl)-1,1″-biferrocenium triiodide ( 2 ) are reported. Compound 1 gives a Mossbauer spectrum with a single “average-valence” doublet at 77 K. On the other hand, compound 2 gives a Mossbauer spectrum with two quadrupole-split doublets at 300 K. Furthermore, compound 1 shows relatively EPR isotropic g tensors compared to compound 2 . Therefore, compound 1 is judged to have an electron-transfer rate in excess of ~ 10 10 s −1 , whereas the electron-transfer rate for 2 is slower than ~ 10 7 s −1 . Both compounds are localized on the IR timescale. Thus, the change of interannufar bridge in biferrocenium cations leads to a dramatic influence on the rate of electron transfer. It is concluded that compound 1 has a higher degree of electronic coupling between two iron ions than compound 2 . This difference in rate possibly originates in a structural difference in the interannular bridge in 1 and 2 ." @default.
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- W2034001921 date "1992-04-01" @default.
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- W2034001921 title "The effect of interannular bridge on electron-transfer rate in mixed-valence biferrocenium triiodide salts" @default.
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- W2034001921 doi "https://doi.org/10.1016/0022-328x(92)83209-z" @default.
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