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Issue 18, 2011
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Reactivity of coordinatively unsaturated iron complexes towards carbon monoxide: to bind or not to bind?

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Abstract

An overview of the reactivity of coordinatively unsaturated iron complexes (in most cases Fe(II)) towards carbon monoxide is presented. Unsaturated iron complexes are known with coordination numbers (CN) of two to five adopting linear or slightly bent (CN = 2), trigonal (CN = 3), tetrahedral, square planar or trigonal pyramidal (CN = 4), and square-pyramidal or trigonal-bipyramidal geometries (CN = 5), respectively. The binding of CO depends strongly on the number and the nature of co-ligands (overall ligand field strength), the charge of the complex, the complex geometry, and the spin state of the unsaturated metal center. In many cases, CO addition to high-spin iron complexes takes place with concomitant spin state changes forming compounds in the lowest possible spin state, i.e., with S = 0. In several other cases, however, the addition of CO is reversible or is even totally rejected altogether for either thermodynamic or kinetic reasons. In the case of the latter such reactions are termed “spin-blocked” or “spin forbidden”.

Graphical abstract: Reactivity of coordinatively unsaturated iron complexes towards carbon monoxide: to bind or not to bind?

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Publication details

The article was received on 25 Nov 2010, accepted on 27 Jan 2011 and first published on 07 Mar 2011


Article type: Perspective
DOI: 10.1039/C0DT01636E
Citation: Dalton Trans., 2011,40, 4778-4792
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    Reactivity of coordinatively unsaturated iron complexes towards carbon monoxide: to bind or not to bind?

    D. Benito-Garagorri, I. Lagoja, L. F. Veiros and K. A. Kirchner, Dalton Trans., 2011, 40, 4778
    DOI: 10.1039/C0DT01636E

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