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The tetrameric neodymium-silsesquioxane cage complex,{[(i-C_4H_9)_7(Si_7O_(12))Nd])4NaCl},was prepared and used as precursor for the polymerization of isoprene.When activated by AlEt_3 in the presence of TMSCl,this POSS-Nd complex (POSS=polyhedral oligome