Ring, ring! C6F6.+ Os2F11− and C6F6.+Sb2F11− have isomorphous crystal structures and each contain two different C6F6.+ cations. One is a quinoid structure, the other bisallyl structure. Calculations show that indeed two such Jahn–Teller distorted structures coexist with essentially the same energy. This seems to be a case of bond-stretch isomerism.
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Shorafa et al. (2009) studied this question.
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