Carbonylmolybdenum complexes with di(imino)pyridine and related ligands: Reduction of a di(imino)pyridine to an aminoiminopyridine system under mild conditions

The reactions of [Mo(CO)(6)] towards a 2,6-di(imino)pyridine L-1 and related ligands were studied. The reaction with L-1 afforded two new complexes, [Mo(CO)(4)L-1] (1) and [Mo(CO)(4)L-2] (2), where L-2 is the 2-amino-6-iminopyridine ligand arising from the hydrogenation of one imine function of L-1; similar reaction with a 2-acetyl-6-iminopyridine ligand L-3 afforded [Mo(CO)(4)L-3] (3). Compounds 1, 2 and 3 have been fully characterised by IR, H-1 NMR and X-ray crystallography; they present a metal ion in a pseudo-octahedral environment, the three organic ligands acting with bidentate N-2 coordination modes. One of the imine functions in 1, the amine function in 2, and the ketone function in 3 are uncoordinated. (c) 2006 Elsevier B.V. All rights reserved.