Key points are not available for this paper at this time.
The dimetallic fulvalene-bridged dysprosium complex Dy (Cp*) (μ-BH4) 2 (Fvtttt) (1, Cp* = C5Me5) is converted into the trimetallic borohydride-bridged species Dy (Cp*) (Fvtttt) 2Dy (μ-BH4) 3 (2). In turn, 2 is reacted with a silylium electrophile to give Dy (Cp*) (μ-BH4) (Fvtttt) 2DyB (C6F5) 4 (3B (C6F5) 3), the first trimetallic dysprosocenium cation. Compound 3B (C6F5) 3 can also be formed directly from 1 by adding two equivalents of the electrophile. A three-fold enhancement in the effective energy barrier from 2 to 3 is observed and interpreted with the aid of ab initio calculations.
He et al. (Fri,) studied this question.