Rigid ferrocene-ferrocene dimer as a common building block in the crystal structures of ferrocene derivatives
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The CSD study shows that 46.8% of ferrocene (Fc) containing crystal structures form a ferrocene-ferrocene dimer (FcD). In all those 2120 structures the FcD exhibits very similar geometry. An outstanding electrostatic complementarity between the Fc units within the dimer explains very frequent formation and constrained geometry of this building block.