Reversible Expansion and Contraction of a 1,2-Diborylated Ferrocene Dimer Promoted by Redox Chemistry and Nucleophile BindingAcknowledgement is made to the National Science Foundation (CAREER award CHE-0346828 to F.J.), to the donors of the Petroleum Research Fund, administered by the American Chemical Society, and to the Rutgers University Research Council for support of this research. We are grateful to Prof. Nicholas J. Turro and Alberto Moscatelli for recording of the EPR spectrum and to Dr. Kakalis for acquisition of 2D NMR spectra. We would also like to thank Prof. Jack Norton for insightful discussions.