Titanium complexes containing new dianionic tetradentate [ONNO]-type ligands with benzyl substituents on bridging nitrogen atoms: Syntheses, X-ray structures, and catalytic activities in ring opening polymerization of lactide

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Several titanium isopropoxides 1-8 have been prepared by the reaction of Ti(O-i-Pr)(4) with a series of corresponding tetradentate Salan-type [ONNO] ligands with benzyl or methyl substituents on bridging nitrogen atoms. They have been characterized by (1)H NMR, (13)C{(1)H} NMR, and elemental analysis. Solid state structures of compounds 2, 4, 6, and 7 have been determined by X-ray crystallography. X-ray diffraction analysis and (1)H NMR confirmed that these titanium complexes were all monomeric species with a six-coordinated central titanium in their solid and solution structures. Complexes 2, 4, 6, and 8 with benzyl substituents on bridging nitrogens gave PLA with higher molecular weight than compounds 1, 3, 5, and 7 with methyl substituents did. (C) 2009 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2009-10
Language
English
Article Type
Article
Keywords

CHELATING DIARYLOXO LIGANDS; CYCLIC ESTERS; ALKOXIDE INITIATORS; OLEFIN POLYMERIZATION; LIVING POLYMERIZATION; ZIRCONIUM COMPLEXES; ALUMINUM; CHLOROTITANIUM; TITANATRANES

Citation

JOURNAL OF ORGANOMETALLIC CHEMISTRY, v.694, no.21, pp.3409 - 3417

ISSN
0022-328X
DOI
10.1016/j.jorganchem.2009.06.037
URI
http://hdl.handle.net/10203/97993
Appears in Collection
CH-Journal Papers(저널논문)
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