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The dication crystallises with imposed two-fold symmetry. Both cations show P–C bonds appreciably shortened with respect to the parent compound 1,6-diphosphatriptycene. The cage C–C bonds are longer than the opposite bonds in the phenyl rings. The C(Ar)–P–C(Ar) angles widen by 6–7° compared with the parent compound.

Diphosphatriptycenium cations: structures of the triflate salts of P-methyl-diphosphatriptycenium and P,P′-dimethyl-diphosphatriptycenium