Formation of a highly asymmetric tridentate new ligand upon addition of acetone to a co-ordinated 1,4-diazabuta-1,3-diene

Abstract

The new ligand Bu^t–NCH–CH(CH₂COMe)–N(H)–Bu^t has been formed on intramolecular addition of acetone to an imine group of the co-ordinated diazabutadiene in fac-[Mn(CO)₃(Bu^t–NCH–CHN–Bu^t)(MeCOMe)][ClO₄], (1); the structures of cis-[Mn(CO)₂(CN–Bu^t){Bu^t–NCH-CH(CH₂COMe)–N(H)–Bu^t}][ClO₄], (4), and cis, trans-[Mn(CO)₂(CN–Bu^t)₂{Bu^t–NCH–CH(CH₂COMe)–N(H)–Bu^t}][ClO₄], (5), where the ligand acts in a tridentate and a bidentate fashion respectively, have been established by X-ray diffraction methods.