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The condensation of acetylacetone (CH3COCH2COCH3) with benzdine (H2N-C6H4-C6H4-NH2) yielded diimine ligand 1 HOC(Me)C(H)(Me)C=N(p-C6H4)(C6H4-p)N= C(Me)C(H)C(Me)OH),which was converted into sodium salts.And then the sodium salts reacted with monosalicylaldiminato titanium complex 2{3,5-di-But-2-(O)C6H2CHN(PH) TiCl3(THF)} in dried dichloromethane to give a new benzdine-bridged binuclear complex 3{3,5-di-But-2-(O)C6H2CHN(PH) 2 OC(Me)C(H)(Me)C=N(p-C6H4)-(C6H4-p)N=C(Me)C(H) C(Me) Ti2Cl4}.The complex 3 was charac-terized by 1HNMR and elemental analysis.In the presence of MAO(methylaluminoxane),the complex 3 in toluene was effective to catalyze polymerization,affording moderately high catalytic activity 1.93×105 g PE /(mol·Ti·h) and high molecular weight polyethylene 5.63×105 g/mol.The high temperature gel permeation chromatography (GPC) curve of polyethylene obtained revealed a single peak,but the molecular weight distribution (MWD=3.21) is obviously broader than that of the similar mononuclear titanium complex.The melting points of the obtained polyethylene reaches 138 ℃,indicating that the polyethylene is of high crystallinity.
The condensation of acetylacetone (CH3COCH2COCH3) with benzdine (H2N-C6H4-C6H4-NH2) yielded diimine ligand 1 HOC (Me) C (H) (Me) C = N (p- C6H4) (C6H4-p) N = C ( Which was converted into sodium salts. And then the sodium salts reacted with monosalicylaldiminato titanium complex 2 {3,5-di-But-2- (O) C6H2CHN (PH) TiCl3 (THF)} in dried dichloromethane to give a new benzdine-bridged binuclear complex 3 {3,5-di-But-2- (O) C6H2CHN (PH) The complex 3 was charac-terized by 1H NMR and elemental analysis. The presence of MAO (methylaluminoxane), (C 6 H 4 -p) N = C (Me) C the complex 3 in toluene was effectively catalyzed polymerization, affording moderately high catalytic activity 1.93 × 10 5 g PE / (mol · Ti · h) and high molecular weight polyethylene 5.63 × 10 5 g / mol.The high temperature gel permeation chromatography (GPC) curve of polyethylene was revealed a single peak, but the molecular weight distribution (MWD = 3.21) is obviously broader than that of similar similar mono nuclear titanium complex.The melting points of the obtained polyethylene reaches 138 ℃, indicating that the polyethylene is of high crystallinity.