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Syntheses of some new group 4 non‐Cp complexes bearing schiff‐base, thiophene diamide ligands respectively and their catalytic activities for α‐olefin polymerization
Author(s) -
Huang JiLing,
Lian Bing,
Yong Li,
Qian YanLong
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040220617
Subject(s) - chemistry , methylaluminoxane , schiff base , polymerization , thiophene , polymer chemistry , trimethylsilyl , ligand (biochemistry) , catalysis , ethylene , toluene , phosphoramidite , medicinal chemistry , organic chemistry , polymer , metallocene , dna , biochemistry , receptor , oligonucleotide
Totally sixteen new titanium and zirconium non‐Cp complexes supported by Schiff‐base, or thiophene diamide ligands have been synthesized. The complexes are obtained by the reaction of M(OP T ‐ i ) 4 (M=Ti, Zr) with the corresponding Schiff‐base ligand in 1: 1 molar ratio in good yield. The thiophene diamide titanium complex has been prepared from trimethylsilyl amine [N,S,N] ligand and TiCl 4 in toluene at 120 °C. All complexes are well characterized by 1 H NMR, IR, MS and elemental analysis. When activated by excess methylaluminoxane (MAO), complexes show moderate catalytic activity for ethylene polymerization, and complex 1f (R 1 =CH 3 , R 2 =Br) exhibits the highest activity for ethylene and styrene polymerization. When the complexes were preactivated by triethylaluminum (TEA), both polymerization activities and syndiotacticity of the polymers were greatly improved.