“…With asymmetrical 1,1′‐disubstituted ferrocenes, e.g. 1′‐aminoferrocene‐1‐carboxylic acid (Fca),10 several linkages are conceivable, which should lead to different communication channels.In “dimers” of Fca, a symmetrical ureylene bridge MeOOC–Fn–NH–CO–NH–Fn–COOMe (“head–head dimer”),10b,11 an asymmetrical amide bridge (“head–tail dimer”),10a,12,13 and a symmetrical anhydride bridge (“tail–tail” dimer) can be formed (Fn = 1,1′‐disubstituted ferrocene) (Scheme ). The different number, type, and hybridization of the bridging atoms (2–3; C, N, O atoms; formal sp 2 , sp 3 ) and the preferred relative orientations of the ferrocene units are believed to modulate the communication pathways.…”