Acta Cryst. (2004). E60, m1587-m1589  [ doi:10.1107/S1600536804024766 ]

Bis[-2-(phenylamido)pyridine]bis{[2-(phenylamino)pyridine]lithium(I)}

W. Clegg and S. T. Liddle

Abstract: The title complex, [Li(PhN-2-C₅H₄N)(PhNH-2-C₅H₄N)]₂ or [Li₂(C₁₁H₉N₂)₂(C₁₁H₁₀N₂)₂], is centrosymmetric with a central Li₂N₂ ring formed by two amide ligands bridging the two Li⁺ centres. Each amide ligand also coordinates through its pyridine N atom to one of the Li⁺ cations, giving LiNCN chelate four-membered rings. Each neutral amine ligand coordinates terminally to one Li⁺ cation and forms an intramolecular N-HN hydrogen bond by donation from its amine group to the bridging amido N atom of one of the amide ligands. The coordination of Li is distorted tetrahedral by two bridging amido and two pyridyl N atoms. The complex is the product of partial deprotonation of 2-phenylaminopyridine by alkyllithium reagents, the remaining amine NH groups being sterically inaccessible even to strong bases.

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