Russian Chemical Bulletin

, Volume 65, Issue 7, pp 1743–1749 | Cite as

Synthesis, structure, and catalytic activity of new aluminum and titanium complexes based on aminobisphenolate ligands containing bulky substituents

  • E. A. Kuchuk
  • K. V. Zaitsev
  • F. A. Mamedova
  • A. V. Churakov
  • G. S. Zaitseva
  • D. A. Lemenovsky
  • S. S. Karlov
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Abstract

A reaction of aminobisphenols EtN{CH2[(4-Alk)(6-But)(2-HO)C6H2]}2, Alk = Me (1); But (2) containing alkyl substituents in the phenol groups with trimethylaluminum and tetra(tert-butoxy)titanium gave two new aluminum derivatives with the Me–Al bond: EtN{CH2[(2-Alk)-(4-But)C6H2(2-O–)]}2Al–Me, Alk = Me (3); But (4), and two new titanium derivatives with the ButO–Ti bond: EtN{CH2[(2-Alk)(4-But)C6H2(2-O–)]}2Ti(O–But)2, Alk = Me (5); But (6). The structures of new compounds were confirmed by NMR spectroscopy and elemental analysis. The structures of complexes 3 and 6 were studied by X-ray crystallography. Complexes 3 and 6 are monomeric in the solid phase: a coordination number of Al atom is 4, that of Ti atom is 5, in addition to the M–O bonds the M←N interactions are also present. Complexes 3–6 were studied as initiators of the ring-opening polymerization of ε-caprolactone. The resulting polymers are characterized by relatively high values of number average molecular weight, with the polydispersity being relatively low.

Keywords

aluminum titanium complexes polymerization biodegradable polymers X-ray diffraction analysis tridentate ligands 
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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • E. A. Kuchuk
    • 1
  • K. V. Zaitsev
    • 1
  • F. A. Mamedova
    • 2
  • A. V. Churakov
    • 3
  • G. S. Zaitseva
    • 1
  • D. A. Lemenovsky
    • 1
  • S. S. Karlov
    • 1
  1. 1.Department of ChemistryM. V. Lomonosov Moscow State UniversityMoscowRussian Federation
  2. 2.Baku BranchM. V. Lomonosov Moscow State UniversityBaku, pos. KhodzhasanAzerbaijan
  3. 3.N. S. Kurnakov Institute of General and Inorganic ChemistryRussian Academy of SciencesMoscowRussian Federation

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