Synthesis, structural determination, and ethylene polymerization chemistry of mono(salicylaldiminato) complexes of titanium(IV)

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Abstract

Titanium(IV)mono(salicylaldiminato) complexes [L1Ti(NMe2)3] (1) and [L1TiCl3] (2) have been synthesized by treatment of Ti(NMe2)4 or TiCl4 with one equivalent of [4,6-Bu2t-2- (CH=NBut)C6H3OH] (L1H) or [4,6-Bu2t-2-(CH=NBut) C6H3OSiMe3] (L1SiMe3), respectively. The compounds are monomeric in solution and in the solid-state. Reactions of TiCl4 with one equivalent of [4,6-Bu2t-2-(CH=NCH2Ph) C6H3OH] (L2H) and [4,6-Bu2t-2-{CH=N(2- C6H4OH)}C6H3OH] (L3H2) produced [L2TiCl2 (μ-Cl)]2 (3) and [L3TiCl2] 2 (4), respectively. [L3TiCl2(THF)] (5) was also produced in quantitative yield when 4 was stirred in THF for 16 h. The reaction of TiCl4 with L3H2 (Two equivalents) in toluene gave [(L3)2Ti] (6). The molecular structures of 2-4 and 6 were established by single-crystal X-ray diffraction studies; and 4 displayed a rare face to face π-π stacking interaction in its structure. Compounds 1 and 2 showed modest ethylene polymerization activities at 25 °C with 900 molar equivalents of methylalumoxane (MAO) as co-catalyst.

Original languageEnglish
Pages (from-to)134-141
Number of pages8
JournalJournal of Organometallic Chemistry
Volume678
Issue number1-2
DOIs
StatePublished - Jul 15 2003

Keywords

  • Olefin polymerization
  • Salicylaldiminato ligands
  • Schiff base ligands
  • Titanium(IV) complexes

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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