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Activation of [CrCl3{R-SN(H)S-R}] catalysts for selective trimerization of ethene: a freeze-quench Cr K-edge XAFS study

Citation

Bartlett, SA and Moulin, J and Tromp, M and Reid, G and Dent, AJ and Cibin, G and McGuinness, DS and Evans, J, Activation of [CrCl3{R-SN(H)S-R}] catalysts for selective trimerization of ethene: a freeze-quench Cr K-edge XAFS study, ACS Catalysis, 4, (11) pp. 4201-4204. ISSN 2155-5435 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 American Chemical Society

DOI: doi:10.1021/cs501017g

Abstract

Homogeneous chromium catalysts for the selective conversion of ethene to hex-1-ene are formed from Cr(III) reagents, aminothioether ligands of the type HN(CH2CH2SR)2, and aluminum reagents. In this study, the early activation steps are investigated by EPR, UV–visible, and Cr K-edge XAFS spectroscopy; rapid stopped-flow mixing and a freeze-quench allows good quality EXAFS analysis of a species formed in ∼1 s of reaction. This is shown to involve reduction to Cr(II) and deprotonation of a NH group of the auxiliary ligand. This 4-coordinate metal center may act as precursor for the coordination of ethene and subsequent selective oligomerization.

Item Details

Item Type:Refereed Article
Keywords:chromium, catalysis, trimerization, homogeneous catalysis, oligomerization, XAFS spectroscopy, DFT calcuations
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:97334
Year Published:2014
Web of Science® Times Cited:6
Deposited By:Chemistry
Deposited On:2014-12-11
Last Modified:2015-04-28
Downloads:0

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