1-(R)-{2-[1-(R)-(N,N-Dimethylamino)ethyl]-1,1'-(S,S)-biferrocen-2'-yl}ethyl-N,N-dimethylammonium Trichloro(dimethyl sulfoxide-S)platinate(II)

The structure of title compound, C₂₈H₃₇Fe₂N₂⁺·C₂H₆Cl₃OPtS^-, reveals an unusual twisting of the ferrocenyl moieties in the monoprotonated bis-amine with respect to the interferrocenyl C-C bond. This deformation can be ascribed to hydrogen bonding between the amine proton and the unprotonated amine residue. The absolute configuration at each of the chiral C atoms is shown to be R while the metallocene chiralities are S.

-1