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A mixed-valence state of the cation radical tetrathiafulvalene dimer, (TTF)2+*, is generated by the electrochemical oxidation of a stacked TTF dimer accommodated within an organic-pillared coordination cage. This mixed-valence species is remarkably stable (t1/2 = approximately 1 day at room temperature in aqueous solution under air) and clearly characterized by cyclic voltammogram and electronic absorption spectroscopy.
Yoshizawa et al. (2005) studied this question.