Formation of (MgCl2)x Polynuclear Species During Preparation of Active MgCl2 Supported Ziegler–Natta Catalysts from Solid Solvates with Lewis Bases

During the structural evolution of MgCl2 Lewis base adducts for the industrial preparation of heterogeneous Ziegler–Natta catalysts, disordered polynuclear (MgCl2)x species are formed that explain the high degree of nanoporosity of the active δ form of MgCl2 obtained in the process.