A New Titanium Complex Having Two Phenoxy-Imine Chelate Ligands for Ethylene Polymerization
A new titanium complex having two phenoxy‐imine chelate ligands, bis[N‐(3‐tert‐butylsalicylidene)anilinato]titanium(IV)dichloride 1, was synthesized and its structure determined by X‐ray analysis. Density functional theory (DFT) calculations and X‐ray analysis suggest that complex 1, when activated,...
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Published in | Macromolecular chemistry and physics Vol. 203; no. 1; pp. 59 - 65 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag GmbH
01.01.2002
WILEY‐VCH Verlag GmbH Wiley |
Subjects | |
Online Access | Get full text |
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Summary: | A new titanium complex having two phenoxy‐imine chelate ligands, bis[N‐(3‐tert‐butylsalicylidene)anilinato]titanium(IV)dichloride 1, was synthesized and its structure determined by X‐ray analysis. Density functional theory (DFT) calculations and X‐ray analysis suggest that complex 1, when activated, possesses two available cis‐located sites needed for ethylene polymerization. Complex 1/methylaluminoxane (MAO) in toluene or heptane solvent displayed very high ethylene polymerization activities (2 280–4 150 (kg PE)·(mol cat)–1·h–1) with high molecular weight values (M̄v = 288 000–881 000) at 25–75°C under atmospheric pressure. The activity values displayed by complex 1/MAO are some of the highest values exhibited by any titanium complex with no cyclopentadienyl (Cp) ligand(s). Alternatively, complex 1/iBu3Al/Ph3CB(C6F5)4 in toluene solvent displayed high ethylene polymerization activities (190–670 (kg PE)· (mol cat)–1·h–1) with exceptionally high molecular weight values (M̄v = 3 920 000–5 860 000) at 25–75°C under atmospheric pressure. The molecular weight values displayed by complex 1/iBu3Al/Ph3CB(C6F5)4 are some of the largest values displayed by homogeneous olefin polymerization catalysts including the group 4 metallocenes. The high potential of complex 1 for ethylene polymerization has therefore been demonstrated. |
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Bibliography: | ark:/67375/WNG-HRCCFXHJ-V istex:E95A14C7D63CD68CDC3581BD1CC60102EE5766C1 ArticleID:MACP59 |
ISSN: | 1022-1352 1521-3935 |
DOI: | 10.1002/1521-3935(20020101)203:1<59::AID-MACP59>3.0.CO;2-6 |