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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) 2 Mg(THF) 2 ( 2 ). The reactions of the Li(FcPI) with CpTiCl 3 gave CpTiCl 2 (FcPI) · CH 2 Cl 2 ( 4 ), whereas with CpZrCl 3 · DME a mixture of three products is formed: CpZrCl(FcPI) 2 ( 5 ), CpZrCl 2 (FcPI) ( 6 ), and (FcPI) 2 ZrCl 2 · CH 2 Cl 2 ( 3 · CH 2 Cl 2 ). The crystal structures of compounds 2 – 6 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) 2 ZrCl 2 is highly active for the oligomerisation of ethylene, to give products with average degrees of polymerisation of 12–16. |
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