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Published on: November 21, 2017
Titanium and Vanadium Complexes of Tridentate Phenoxy-Imine and Phenoxy-Amine Ligands and Their Application in the
Marzena Białek1, Alicja Klimasińska1, Grzegorz Spaleniak1
1Institute of Chemistry, University of Opole, Oleska 48, 45-052 Opole, Poland.
Abstract:
Phenoxy-imine and phenoxy-amine proligands, with the additional OH donor groups 2,4-Bu2-6-(2-CH2(OH)-C6H4N=CH)C6H3OH (L), 6-(2-CH2(OH)-C6H4N=CH)C6H3OH (L), and 2,4-Bu2-6-(2-CH2(OH)-C6H4NH-CH)C6H3OH (L), were synthesized and their titanium (Ti-L-Ti-L) and vanadium (V-L-V-L) complexes were prepared in reactions with Ti(OPr)4 and VO(OPr)3, respectively. All new compounds were characterized with the use of FTIR, 1H, and 13C NMR spectroscopy; X-ray crystallography was also used to study proligands. All the complexes proved to be active catalysts in the ring-opening polymerization (ROP) of ε-caprolactone, rac-lactide, and L-lactide in the melt. The effects of the complex structure (transition metal type, presence of tBu substituents, and type of nitrogen donor group), as well as the polymerization time and temperature, on the monomer conversion and polymer properties were investigated in detail.
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