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  • Journal article
    Britovsek GJP, Cohen SA, Gibson VC, van Meurs Met al., 2004,

    Iron catalyzed polyethylene chain growth on zinc: a study of the factors delineating chain transfer versus catalyzed chain growth in zinc and related metal alkyl systems

    , Journal of the American Chemical Society, Vol: 126, Pages: 10701-10712, ISSN: 0002-7863
  • Journal article
    Britovsek GJP, Woo GYY, Assavathorn N, 2003,

    Synthesis and reactivity of water-soluble platinum(II) complexes containing nitrogen ligands

    , JOURNAL OF ORGANOMETALLIC CHEMISTRY, Vol: 679, Pages: 110-115, ISSN: 0022-328X
  • Journal article
    Britovsek GJP, Gibson VC, Hoarau OD, Spitzmesser SK, White AJP, Williams DJet al., 2003,

    Iron and cobalt ethylene polymerization catalysts: Variations on the central donor

    , INORGANIC CHEMISTRY, Vol: 42, Pages: 3454-3465, ISSN: 0020-1669
  • Journal article
    Britovsek GJP, Baugh SPD, Hoarau O, Gibson VC, Wass DF, White AJP, Williams DJet al., 2003,

    The role of bulky substituents in the polymerization of ethylene using late transition metal catalysts: a comparative study of nickel and iron catalyst systems

    , INORGANICA CHIMICA ACTA, Vol: 345, Pages: 279-291, ISSN: 0020-1693
  • Patent
    Britovsek GJP, Cohen SA, Gibson VC, 2003,

    Chain growth reaction process

    , WO03014046
  • Patent
    Britovsek GJP, Cohen SA, Gibson VC, 2002,

    Chain growth reaction process using zinc alkyls for preparation of olefin oligomers

    , 2003014046
  • Journal article
    Britovsek GJP, Clentsmith GKB, Gibson VC, Goodgame DML, McTavish SJ, Pankhurst QAet al., 2002,

    The nature of the active site in bis(imino)pyridine iron ethylene polymerisation catalysts

    , CATALYSIS COMMUNICATIONS, Vol: 3, Pages: 207-211, ISSN: 1566-7367
  • Journal article
    Britovsek GJP, Cohen SA, Gibson VC, Maddox PJ, Van Meurs Met al., 2002,

    Iron-catalyzed polyethylene chain growth on zinc: Linear α-olefins with a poisson distribution

    , Angewandte Chemie - International Edition, Vol: 41, Pages: 489-491, ISSN: 1433-7851

    Bis(imino)pyridineiron complexes are not only highly active for ethylene polymerization, they are shown to catalyze efficient polyethylene chain growth at zinc centers - formally an iron-catalyzed Aufbaureaktion on zinc (see scheme). The grown alkyl chains can be displaced from the zinc centers by an olefin exchange reaction catalyzed, for example, [Ni(acac)2] (acac = acetylacetonate) to give linear α-olefins with a Poisson distribution.
  • Journal article
    Britovsek GJP, Gibson VC, Spitzmesser SK, Tellmann KP, White AJP, Williams DJet al., 2002,

    Cationic 2,6-bis(imino)pyridine iron and cobalt complexes: synthesis, structures, ethylene polymerisation and ethylene/polar monomer co-polymerisation studies

    , JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, Pages: 1159-1171, ISSN: 1472-7773
  • Journal article
    Britovsek GJP, Cohen SA, Gibson VC, Maddox PJ, van Meurs Met al., 2002,

    Iron-catalyzed polyethylene chain growth on zinc:: Linear α-olefins with a Poisson distribution

    , ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 41, Pages: 489-491, ISSN: 1433-7851
  • Journal article
    Britovsek GJP, Clentsmith GKB, Gibson VC, Goodgame DML, Pankhurst Q, McTavish SJet al., 2001,

    Spectroscopic studies on iron-based ethylene polymerization catalysts.

    , ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 222, Pages: U415-U415, ISSN: 0065-7727
  • Journal article
    Britovsek GJP, Gibson VC, Mastroianni S, Oakes DCH, Redshaw C, Solan GA, White AJP, Williams DJet al., 2001,

    Imine versus amine donors in iron-based ethylene polymerisation catalysts

    , EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Pages: 431-437, ISSN: 1434-1948
  • Journal article
    Magill AM, McGuinness DS, Cavell KJ, Britovsek GJP, Gibson VC, White AJP, Williams DJ, White AH, Skelton BWet al., 2001,

    Palladium(II) complexes containing mono-, bi- and tridentate carbene ligands. Synthesis, characterisation and application as catalysts in C-C coupling reactions

    , JOURNAL OF ORGANOMETALLIC CHEMISTRY, Vol: 617, Pages: 546-560, ISSN: 0022-328X
  • Conference paper
    Britovsek GJP, Clentsmith GKB, Gibson VC, Goodgame DML, Pankhurst Q, McTavish SJet al., 2001,

    Spectroscopic studies on iron-based ethylene polymerization catalysts (Meeting abstract CATL-040)

    , Washington, D.C., Abstracts of papers, 222nd ACS national meeting, Chicago, IL, United States, 26 - 30 August 2001, Publisher: American Chemical Society
  • Journal article
    Britovsek GJP, Gibson VC, Kimberley BS, Mastroianni S, Redshaw C, Solan GA, White AJP, Williams DJet al., 2001,

    Bis(imino)pyridyl iron and cobalt complexes: the effect of nitrogen substituents on ethylene oligomerisation and polymerisation

    , JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, Pages: 1639-1644, ISSN: 1472-7773
  • Journal article
    Britovsek GJP, Mastroianni S, Solan GA, Baugh SPD, Redshaw C, Gibson VC, White AJP, Williams DJ, Elsegood MRJet al., 2000,

    Oligomerisation of ethylene by bis(imino)pyridyliron and -cobalt complexes

    , Chemistry - A European Journal, Vol: 6, Pages: 2221-2231, ISSN: 0947-6539

    A series of bis(imino)pyridyliron and -cobalt complexes [{2,6- (CR=NAr)2C5H3N}MX2] (R=H, Me; M=Fe, Co; X=Cl, Br) 8-16 containing imino- aryl rings (Ar) with at least one small ortho substituent, as well as Ar=biphenyl and Ar=naphthyl, has been synthesised. Crystallographic analyses of complexes 9 (Ar=2,3-dimethylphenyl), 13 and 14 (Ar=biphenyl; X=Cl or Br, respectively) reveal a distorted trigonal-bipyramidal geometry in the solid state. These complexes, in combination with methyl aluminoxane (MAO), are active catalysts for the oligomerisation of ethylene, yielding >99% linear α-olefin mixtures that follow a Schulz-Flory distribution. Iron ketimine (R=Me) precatalysts give the highest activities and a greater α-value than their aldimine (R=H) analogues. Cobalt precatalysts follow a similar trend, though their activities are almost two orders of magnitude lower than those of the corresponding iron catalysts. Ethylene pressure studies on cobalt precatalyst 15 reveal a first-order dependence on ethylene for both the rate of propagation and the rate of chain transfer, and a pressure independence of the α value.
  • Journal article
    Britovsek GJP, Bruce M, Gibson VC, Kimberley BS, Maddox PJ, Mastroianni S, McTavish SJ, Redshaw C, Solan GA, Strömberg S, White AJP, Williams DJet al., 2000,

    Iron and cobalt ethylene polymerization catalysts bearing 2,6-bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies

    , Chemtracts, Vol: 13, Pages: 303-308, ISSN: 1431-9268

    Chelating 2,6-bis(imino)pyridyl ligands, readily prepared via condensation reactions, coordinate to Fe(II), and Fe(III), and Co(II) halide salts to give monomeric, paramagnetic complexes. Activation of these compounds with methylaluminoxane results in highly reactive catalytic species for the production of linear polyethylene. Iron-based catalysts were found to be more active than cobalt-based systems, and ketimine ligands generally imparted enhanced efficiency compared to the analogous aldimine ligands. Bulky substituents at the ortho positions of the aryl groups were found to be crucial for optimal catalytic activity. Investigations of the various reaction conditions, including amount of MAO, ethylene pressure, reaction time and temperature, revealed that chain termination likely proceeds via two competing mechanisms, namely β-H transfer and chain transfer to aluminum.
  • Journal article
    Gibson VC, Britovsek GJP, Spitzmesser SK, 2000,

    Cationic iron and cobalt complexes containing bis(imino)pyridyl ligands.

    , ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 219, Pages: U426-U426, ISSN: 0065-7727
  • Journal article
    Gibson VC, Britovsek GJP, 2000,

    Advances in iron and cobalt ethylene polymerization systems.

    , ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 219, Pages: U389-U389, ISSN: 0065-7727
  • Journal article
    Gibson VC, Britovsek GJP, Spitzmesser SK, 2000,

    Cationic iron and cobalt complexes containing bis(imino)pyridyl ligands

    , Polymer Preprints, Vol: 41
  • Patent
    Britovsek GJP, Gibson VC, Spitzmesser SK, 2000,

    Cationic Polymerisation Catalysts

    , WO 00/69869
  • Journal article
    Gibson VC, Britovsek GJP, 2000,

    Advances in iron and cobalt ethylene polymerization systems

    , Abstracts of Papers of the American Chemical Society, Vol: 219, Pages: 229-OLY, ISSN: 0065-7727
  • Journal article
    Britovsek GJP, Mastroianni S, Solan GA, Baugh SPD, Redshaw C, Gibson VC, White AJP, Williams DJ, Elsegood MRJet al., 2000,

    Oligomerisation of ethylene by bis(imino)pyridyl iron and -cobalt complexes

    , Chemistry-A European Journal, Vol: 6, Pages: 2221-2231, ISSN: 0947-6539
  • Journal article
    Gibson VC, Britovsek GJP, Spitzmesser SK, 2000,

    Cationic iron and cobalt complexes containing bis(imino)pyridyl ligands

    , Polymer Preprints, Vol: 41
  • Journal article
    Gibson VC, Mastroianni S, McTavish SJ, Britovsek GJPet al., 1999,

    Influence of ligand substituents on polyethylenes generated by bis(imino)pyridyl iron catalysts.

    , ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 218, Pages: U762-U762, ISSN: 0065-7727
  • Journal article
    Griffiths EAH, Britovsek GJP, Gibson VC, Gould IRet al., 1999,

    Full ab initio calculations on bis(imino)pyridine iron catalysts for ethylene polymerization.

    , ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 218, Pages: U762-U762, ISSN: 0065-7727
  • Journal article
    Britovsek GJP, Gibson VC, Wass DF, 1999,

    The search for new-generation olefin polymerization catalysts: Life beyond metallocenes

    , Angewandte Chemie - International Edition, Vol: 38, Pages: 428-447, ISSN: 1433-7851

    The introduction of well-defined, single-site organotransition metal olefin polymerization catalysts in the early 1980s highlighted the possibilities for controlling and dramatically improving the properties of commodity polymer products such as polyethylene and polypropylene. Group 4 metallocenes and half-sandwich titanium-amide complexes (constrained-geometry catalysts) have been at the forefront of these developments, and, as we approach the late 1990s, these catalysts are increasingly finding their way into commercial operations. However, it is generally acknowledged that no single class of catalyst will be capable of controlling all of the macromolecular parameters relevant to a wide and varied range of polyolefinic products. Over the past few years, an intense search has therefore developed, in both academic and industrial research laboratories, for new-generation catalysts. Some of the most significant recent developments have occurred with late transition metal systems. Particularly, the discovery of exceptionally active catalysts based on iron, a metal that had no previous track record of being applied in this way, has signposted the way for further technologically significant advances in the field. In this review, we highlight the key advances that have occurred in the discovery and development of non-Group 4 metallocene catalysts, amply demonstrating that there are significant signs of life beyond the Group 4 metallocenes. © Wiley-VCH Verlag GmbH, 1999.
  • Journal article
    Griffiths EAH, Britovsek GJP, Gibson VC, Gould IRet al., 1999,

    Highly active ethylene polymerisation catalysts based on iron: an ab initio study

    , Chemical Communications, Pages: 1333-1334, ISSN: 1359-7345
  • Journal article
    Britovsek GJP, Gibson VC, Wass DF, 1999,

    The search for new-generation olefin polymerization catalysts: Life beyond metallocenes

    , ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 38, Pages: 428-447, ISSN: 1433-7851
  • Journal article
    Britovsek GJP, Bruce M, Gibson VC, Kimberley BS, Maddox PJ, Mastroianni S, McTavish SJ, Redshaw C, Solan GA, Stromberg S, White AJP, Williams DJet al., 1999,

    Iron and cobalt ethylene polymerization catalysts bearing 2,6- bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies

    , Journal of the American Chemical Society, Vol: 121, Pages: 8728-8740, ISSN: 0002-7863

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Contact

Prof. Dr. George Britovsek FRSC

Director MRes Catalysis & Engineering

Tel: +44 (0)20 7594 5863

Email: g.britovsek@imperial.ac.uk

Department of Chemistry
Imperial College London
Molecular Sciences Research Hub
White City Campus
80 Wood Lane
London W12 0BZ
United Kingdom