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diiminopyridine
The diiminopyridine (DIP) class of ligands are pyridine derivative with imine sidearms appended to the 2,6–positions. The three nitrogen centres can bind metals in a tridentate fashion, forming pincer complexes. Diiminopyridines are notable as non-innocent ligand that can assume more than one oxidation state. Complexes of DIPs participate in a range of chemical reactions, including ethylene polymerization, hydrosilylation, and hydrogenation.
==Synthesis and properties of DIP ligands==
Many 2,6-diiminopyridines have been prepared. The dianilido ligands can be synthesized by Schiff base condensation of commercially available 2,6-diacetylpyridine with two equivalents of substituted anilines. Using substituted anilines, complexes one can obtain DIPs with diverse steric environments. Commonly used anilines are 2,4,6-trimethylaniline and 2,6-diisopropylaniline. Unsymmetric variations have been established by successive condensation of different anilines. The dicarbonyl portion of the backbone can be further modified, as with 2,6-dipyridecarboxaldehyde and 2,6-dibenzoylpyridine. Most commonly, variations in the DIP arise from changes in the anilines.
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