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Issue 24, 2019
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Chelate rings of different sizes with non-innocent ligands

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Redox-active unsaturated chelate ligands can be realised with different ring sizes of the resulting metallacycles. An overview is presented, starting from an exposition of non-innocent behaviour and chelate effects. A systematic approach is used to describe the most familiar situation, the metal complexes of 1,4-hetero-1,3-dienes in established forms (e.g. o-quinone, α-dithiolene, and α-diimine ligands) and with less common combinations of O, S, and N heteroatoms. The different steric and electronic conditions in six-membered chelate ring systems derived from the β-diketonate structure will be discussed with examples of substituted and π extended ligands, including 9-oxidophenalenyl, formazanate, and anions derived from indigo or 9,10-anthraquinone. Four-membered chelate rings existing in at least two ligand-based oxidation states are available through steric and electronic stabilisation in amidinate or triazenide complexes. Three-membered and seven-membered chelate ring situations are discussed briefly as further alternatives.

Graphical abstract: Chelate rings of different sizes with non-innocent ligands

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Article information

03 Apr 2019
06 May 2019
First published
07 May 2019

Dalton Trans., 2019,48, 8521-8529
Article type

Chelate rings of different sizes with non-innocent ligands

W. Kaim, Dalton Trans., 2019, 48, 8521
DOI: 10.1039/C9DT01411J

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