Issue 4, 2013
From the journal:

Catalysis Science & Technology

A strong-field pentadentate ligand in iron-based alkaneoxidation catalysis and implications for iron(iv) oxo intermediates†

Emma Wong,a   Jonathan Jeck,a   Michaela Grau,a   Andrew J. P. Whitea  and  George J. P. Britovsek*a  

* Corresponding authors

a Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London, UK
E-mail: g.britovsek@imperial.ac.uk
Fax: +44 (0)20-75945804
Tel: +44 (0)20-75945863

Abstract

The pentadentate ligand bis(pyridylmethyl)(bipyridylmethyl)amine BPAbipy 1 and the iron(II) complex [Fe(1)(CH3CN)](ClO4)2 have been prepared. The strong field ligand 1 stabilises the low spin iron(II) complex, resulting in a high redox potential of 1.01 V for the Fe(II)/Fe(III) redox couple (vs. SCE). High valent iron complexes are destabilised by strong field ligands and the reaction of [Fe(1)(CH3CN)](ClO4)2 with PhIO is believed to result in a short-lived iron(IV) oxo complex, which is rapidly reduced to the oxo-bridged dinuclear iron(III) complex [(Fe(1))2(μ-O)](ClO4)4. The catalytic properties of the iron(II) complex [Fe(1)(CH3CN)](ClO4)2 for the oxidation of cyclohexane with various amounts of H2O2 has been evaluated. Moderate catalytic activities, comparable to other iron(II) complexes featuring pentadentate ligands but significantly lower than the tetradentate BPMEN ligand, have been observed.

Graphical abstract: A strong-field pentadentate ligand in iron-based alkane oxidation catalysis and implications for iron(iv) oxo intermediates

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Article information

DOI
https://doi.org/10.1039/C3CY20823K
Article type
Paper
Submitted
28 Nov 2012
Accepted
09 Jan 2013
First published
11 Jan 2013

Catal. Sci. Technol., 2013,3, 1116-1122

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A strong-field pentadentate ligand in iron-based alkane oxidation catalysis and implications for iron(IV) oxo intermediates

E. Wong, J. Jeck, M. Grau, A. J. P. White and G. J. P. Britovsek, Catal. Sci. Technol., 2013, 3, 1116 DOI: 10.1039/C3CY20823K

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