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Probing the effects of ligand structure on activity and selectivity of Cr(III) complexes for ethylene oligomerisation and polymerisation

Citation

Moulin, JO and Evans, J and McGuinness, DS and Reid, G and Rucklidge, AJ and Tooze, RP and Tromp, M, Probing the effects of ligand structure on activity and selectivity of Cr(III) complexes for ethylene oligomerisation and polymerisation, Dalton Transactions, 2008, (9) pp. 1177-1185. ISSN 1477-9226 (2008) [Refereed Article]

DOI: doi:10.1039/b716078j

Abstract

A series of distorted octahedral Cr(iii) complexes containing tridentate S-, S/O- or N-donor ligands comprised of three distinct architectures: facultative {S(CH2CH2SC10H21) 2 (L1) and O(CH2CH2SC 10H21)2 (L2)}, tripodal {MeC(CH 2SnC4H9)3 (L 3), MeC(CH2SC10H21)3 (L4)} and macrocyclic {(C10H21)[9]aneN 3 (L5), (C10H21)3[9] aneN3 (L6), with [9]aneN3 = 1,4,7-triazacyclononane} are reported and characterised spectroscopically. Activation of [CrCl3(L)] with MMAO produces very active ethylene trimerisation, oligomerisation and polymerisation catalysts, with significant dependence of the product distribution upon the ligand type present. The properties of the parent [CrCl3(L)] complexes are probed by cyclic voltammetry, UV-visible, EPR, EXAFS and XANES measurements, and the effects upon activation with Me3Al investigated similarly. Treatment with excess Me3Al leads to substitution of Cl ligands by Me groups, generation of an EPR silent Cr species (consistent with a change in the oxidation state of the Cr to either Cr(ii) or Cr(iv)) and substantial dissociation of the neutral S and S/O-donor ligands. © The Royal Society of Chemistry.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Other Chemical Sciences
Research Field:Organometallic Chemistry
Objective Division:Manufacturing
Objective Group:Industrial Chemicals and Related Products
Objective Field:Organic Industrial Chemicals (excl. Resins, Rubber and Plastics)
Author:McGuinness, DS (Dr David McGuinness)
ID Code:55761
Year Published:2008
Web of Science® Times Cited:27
Deposited By:Chemistry
Deposited On:2009-03-13
Last Modified:2014-11-21
Downloads:0

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