Synthesis and structures of ferrocenyl-substituted salicylaldiminato complexes of magnesium, titanium and zirconium

RKJ Bott, M Schormann, DL Hughes, SJ Lancaster, M Bochmann

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N-ferrocenyl salicylaldimine (FcPI)H, readily accessible from aminoferrocene and salicylaldehyde, reacts with dibutylmagnesium in THF to afford a red crystalline (FcPI)2Mg(THF)2 (2). The reactions of the Li(FcPI) with CpTiCl3 gave CpTiCl2(FcPI) · CH2Cl2 (4), whereas with CpZrCl3 · DME a mixture of three products is formed: CpZrCl(FcPI)2 (5), CpZrCl2(FcPI) (6), and (FcPI)2ZrCl2 · CH2Cl2 (3 · CH2Cl2). The crystal structures of compounds 26 are reported. Typically, the N–O chelates are oriented such that O donors are mutually trans, while N donors prefer to be trans to Cl ligands. The redox potentials of these complexes are very similar to ferrocene. On activation with methylaluminoxane, the Ti complex 4 shows moderate activity for ethylene polymerisation, while (FcPI)2ZrCl2 is highly active for the oligomerisation of ethylene, to give products with average degrees of polymerisation of 12–16.
Original languageEnglish
Pages (from-to)387-396
Number of pages10
Issue number2
Publication statusPublished - 2006

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