Fig. 1. Chemical structures of the parent molecule [Dy(Cp^ttt)₂]⁺ (0) and its n-bridged analogues obtained by linking neighbouring tert-butyl groups [(Cp^Rt)₂]²⁻ = [Cp^R-CMe₃ Me₃C-Cp^R]²⁻ to yield the bridging motif [(Cp^Rb)₂]²⁻ = [Cp^R-CMe₂(CH₂)₄CMe₂-Cp^R]²⁻.