@article{Smit:2012:10.1039/c2cy00448h,
author = {Smit, TM and Tomov, AK and Britovsek, GJP and Gibson, VC and White, AJP and Williams, DJ},
doi = {10.1039/c2cy00448h},
journal = {Catal. Sci. Technol.},
pages = {643--655},
title = {The effect of imine-carbon substituents in bis(imino)pyridine-based ethylene polymerisation catalysts across the transition series.},
url = {http://dx.doi.org/10.1039/c2cy00448h},
volume = {2},
year = {2012}
}

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TY  - JOUR
AB  - The synthesis, characterization and ethylene polymn. behavior of a series of first row transition metal complexes of the general formula LMXn (M = Fe, Co, Mn, n = 2, X = Cl; M = V, Cr, Ti, n = 3, X = Cl; M = Ni, n = 2, X = Br) with bis(imino)pyridine ligands L are reported, whereby the ligands contain heteroatom substituents DRm at the imine carbon (D = O, S, m = 1, R = Me, Ph, 2,6-Me2C6H3 or D = N, m = 2, R = Me, Ph).  Only the O- and S-substituted complexes show catalytic activity for the polymn. of ethylene, upon activation with methylaluminoxane (MAO).  The Mn- and Ni-based catalysts were found to be inactive under these conditions.  The S-substituted complexes are generally more active than the O-substituted complexes and the catalytic activities increase with the size of the substituents.  Iron-, vanadium- and chromium-based catalysts give highly active catalyst systems, which in some cases are more active than the well-known ketimine catalysts.  All catalysts produce highly linear polyethylene with mol. wts. affected by M, D and R. O-substituted catalyst systems are generally less active and produce lower mol. wt. polyethylene compared to S-substituted systems. [on SciFinder(R)]
AU  - Smit,TM
AU  - Tomov,AK
AU  - Britovsek,GJP
AU  - Gibson,VC
AU  - White,AJP
AU  - Williams,DJ
DO  - 10.1039/c2cy00448h
EP  - 655
PY  - 2012///
SN  - 2044-4753
SP  - 643
TI  - The effect of imine-carbon substituents in bis(imino)pyridine-based ethylene polymerisation catalysts across the transition series.
T2  - Catal. Sci. Technol.
UR  - http://dx.doi.org/10.1039/c2cy00448h
VL  - 2
ER  - 

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