作者:M. Visseaux、P. Zinck、M. Terrier、A. Mortreux、P. Roussel
DOI:10.1016/j.jallcom.2007.04.140
日期:2008.2
We present in this study a new and one-step method allowing the preparation of an unprecedented family of stable half-lanthanidocenes. X-ray analysis shows that the isolated compounds all display the same ionic Ln-Mg bimetallic structure consisting of two anionic (Cp-R)Ln(BH4)(3) species and one cationic Mg(THF)(6) (Cp-R = C5Me5, Ln = Nd, 1a, Ln = La, 1b; Cp-R = C5H5, Ln=Nd, 2a; Cp-R = C5H2Ph3, Ln = Nd, 3a). Such complexes display high stability with respect to disproportionation in solution. Combined with dialkylmagnesium, neodymium complexes provide powerful catalysts for stereospecitic isoprene polymerisation. (C) 2007 Elsevier B.V. All rights reserved.