Typical Ligands That Often Behave As Redox Non-Innocent Ligands
- O2 and NO.
Ligands with extended pi-delocalization such as porphyrins and phthalocyanines, ligands with the generalised formulas 2- or D=CR-CR=D (D = O, S, NR’ and R, R' = alkyl or aryl), and similar related systems are often non-innocent. For example:
- dioxalenes, such as catecholates.
- dithiolenes, such as 1,2-maleonitriledithiolate
- diimines such as derivatives of 1,2-diaminobenzene, α-diimines, and dimethylglyoxime.
- pyridine-2,6-diimine ligands (relevant in polymerisation and hydrogenation catalysis).
The pyridine-2,6-diimine ligand can be easily reduced by one or two electrons.
Read more about this topic: Non-innocent Ligand
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