Linear Polymeric C702- Ions.
Under mild conditions, a linear polymeric (C702- )n fulleride was synthesized as single crystals which allow, for the first time, a complete structural analysis of a polymeric fulleride. Starting from the strongest "disturbance" of the cage geometry at the linkage sites, the pronounced alternation of the bond lengths decreases towards the middle of the C70 units (see Schlegel diagram of the C702- building block; color coding of the bond lengths [Å]: blue <1.39, black 1.39-1.47, red 1.47-1.52 Å, green >1.52).