Compared to parent ferrocene, the redox potential of the with 2 equiv. of 1. 1•bipy•1 has been structurally characterized by X-ray crystallography. The compound Fe II /Fe III transition is shifted to much more cathodic values in B-N adducts 1•Do and 2•(Do) 2 of borylated ferrocenes tolerates loss of two electrons at the ferrocene groups, as well as two one-electron reductions at the bipy linker. Dark FcBMe 2 (1) and 1,1Ј-fc(BMe 2 ) 2 (2) with pyridine bases Do [Fc: (C 5 H 5 )Fe(C 5 H 4 ); fc: (C 5 H 4 )Fe(C 5 H 4 ); Do: γ-picoline, 4-purple coloured coordination polymers [2•bipy] n are accessible from bipy and 1 equiv. of the diborylated (dimethylamino)pyridine, N-(n-propyl)-4-(4Ј-pyridyl)pyridinium hexafluorophosphate]. Electron donation by one derivative 2. The intense colours of 1•bipy•1 and [2•bipy] n are indicative of charge-transfer interactions between the single BMe 2 •Do substituent at the cyclopentadienyl ligand is approximately equal to the positive inductive effect of the electron-rich ferrocene fragments and the viologen-like R 3 Bbipy-BR 3 acceptor. Neat, solid [2•bipy] n is thermally stable five methyl groups in a C 5 Me 5 (cp*) moiety. Using the bidentate nitrogen ligand 4,4Ј-bipyridine (bipy), the dark-up to 240 °C, but in the presence of toluene, polymerization is fully reversible at about 85 °C. purple dimetallic complex 1•bipy•1 is obtained upon reaction