Zirconium and hafnium amide, alkoxide, and pyrrolyl complexes manifesting with pyrrolyl-linked N-donor ligands: Syntheses, characterization, and ring opening polymerization of ε-caprolactone

Wen Yi Lee, Chun Chin Hsieh, Jia Wei Hsu, Amitabha Datta, Yu Chun Lin, Jui Hsien Huang, Ting Yu Lee

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A series of zirconium and hafnium alkoxide and amide complexes containing symmetrical tridentate pyrrolyl ligand, [C4H2NH(2,5- CH2NMe2)2] have been synthesized conveniently by treatment of 2,6-di-tert-butylphenol, tert-butanol or pyrrole in pentane and their reactivity over ring opening polymerization of ε-caprolactone have been carried out. Reactions of [C4H2NH(2,5-CH 2NMe2)2] with M(NEt2)4 (M = Zr or Hf) originate [C4H2N(2,5-CH2NMe 2)2]M(NEt2)3 (1, M = Zr; 2, M = Hf). Furthermore, reactions of [C4H2N(2,5-CH 2NMe2)2]M(NEt2)3 with 2,6-di-tert-butylphenol, tert-butanol or pyrrole afford [C4H 2N(2,5-CH2NMe2)2]M(OC 6H3-2,6-tBu2)(NEt2) 2 (3, M = Zr; 4, M = Hf), [C4H2N(2,5-CH 2NMe2)2]M(OtBu)3 (5, M = Zr; 6, M = Hf) and [C4H2N(2,5-CH2NMe 2)2]M(C4H4N)3 (7, M = Zr; 8, M = Hf), respectively, in satisfactory yield. All the complexes have been characterized by NMR spectra as well 3, 4 and 6 subjected to the X-ray diffraction analysis. Complexes 3-8 have been used as initiators for the ring-opening polymerization of ε-caprolactone and observed broad PDI values (1.84-2.75) representing multiple reactivity centers of these complexes.

Original languageEnglish
Pages (from-to)3816-3821
Number of pages6
JournalJournal of Organometallic Chemistry
Issue number23
Publication statusPublished - 2011 Nov 15


All Science Journal Classification (ASJC) codes

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

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