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