Effects of counterions on intramolecular electron transfer in 1′,1′″-dinaphthylmethylbiferrocenium cation: structural, Mössbauer and EPR characteristics

The effects of changing the counterion from I3− to BF4− and PF6− anions upon the rate of intramolecular electron transfer in the mixed-valence 1′,1‴-dinaphthylmethylbiferrocenium cation are examined. The X-ray structural determinations of 1′,1‴-dinaphthyl-methylbiferrocenium BF4− and PF6− salts are reported. The 57Fe Mössbauer and EPR results are also reported. We found that relatively minor perturbations caused by the crystallinity and counterions have pronounced effects on the magnitude of electron-transfer rate.