Bis-ligated Ti and Zr complexes of chelating N-heterocyclic carbenes

Amer El-Batta, Andrew W. Waltman, Robert H. Grubbs

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


In this communication we report the synthesis of novel titanium and zirconium complexes ligated by bidentate "salicylaldimine-like" N-heterocyclic carbenes (NHC). Double addition of the NHC chelate to either TiCl4(thf)2 or ZrCl4 forms bis-ligated organometallic fragments with a distorted octahedral geometry. These complexes are rare examples of group IV transition-metal NHC adducts. Preliminary catalytic tests demonstrate that in the presence of methylaluminoxane (MAO) these complexes are useful initiators for the polymerization of ethylene and the copolymerization of ethylene with norbornene and 1-octene. © 2011 Elsevier B.V. All rights reserved.
Original languageEnglish (US)
Pages (from-to)2477-2481
Number of pages5
JournalJournal of Organometallic Chemistry
Issue number13
StatePublished - Jul 2011
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): K-C1-019-12
Acknowledgements: This publication was based on work supported by Award No. K-C1-019-12 made by King Abdullah University of Science and Technology (KAUST). The support of King Fahd University of Petroleum and Minerals (KFUPM) is also highly appreciated. We would like to thank Dr. Vincent Lavallo (Caltech) for helpful discussion and technical support, Larry Henling and Mike Day (Caltech) for X-ray crystallographic analysis, Lester McIntosh (Rohm and Haas) for assistance with olefin polymerizations and polymer analysis, and Albemarle Corporation for the generous gift of MAO. The Bruker KAPPA APEX II X-ray diffractometer was purchased via an NSF Chemistry Research Instrumentation and Facilities: Multi-User award to the California Institute of Technology, CHE-0639094.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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