Polymerization in a nutshell: A discrete spherical Pd12L24 complex was prepared that confines 24 tethered methyl methacrylate (MMA) units internally (see picture; shell blue, Pd yellow, O red, C gray; MMA shown as space-filling representation). Endohedral radical polymerization of the monomer proceeds efficiently as a result of the high concentration of MMA units within the restricted space of the core (inner diameter: 3.7 nm).
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