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Reversible CC bond breaking/making as well as drastic change in color are induced upon electron transfer in the novel redox couples of hexaarylethanes 1 and bis(triarylmethyl) dications 22+. Their hysteretic redox behaviors result from the quite different geometries of 1 and 22+. Ar = p-Me2NC6H4, p-MeOC6H4.
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Suzuki et al. (1997) studied this question.
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