Supramolecular structures of biferrocene and biferrocenium is reported.
Biferrocenediboronic acid formed hydrogen-bonded 1D chains in the solid state.
Solvent molecules capped or connected the 1D chains by hydrogen-bonding.
Biferroceniumdiboronic acid formed hydrogen-bonded 1D chains and discrete dimers.
The valence states of biferrocenium were detrapped and trapped, respectively.