Ayfer MENTEŞ, Orhan BÜYÜKGÜNGÖR, M. Emre HANHAN, Seda SEZEK

Dinuclear molybdenum tetracarbonyl complexes of tetradentate nitrogen ligands and intermolecular hydrogen bonding in the crystal structure of N,N'-bis-(1-(pyridin-2-yl) ethylidene)-ethane-1,2-diamine

Multidentate N-ligands (Schiff bases) were prepared by the condensation of 2-acetylpyridine or 2-benzoylpyridine, and 1,2-diaminoethane or 1,6-diaminohexane (2:1 ratio) in ethanol. These ligands were reacted with $Mo(CO)_6$ to obtain dinuclear metal tetracarbonyl compounds. Both terminal amine groups were seen to form imines from the reaction of mono-ketones with diamines in 2:1 or 1:1 ratios. The structures of these ligands and metal complexes were characterized by elemental analysis, and FT-IR, $^1H$-NMR, $^{13}C$-NMR, and LC-MS spectral techniques. N,N'-bis[1- (pyridin-2-yl)ethylidene]ethane-1,2-diamine, which was obtained by the reaction of 2-acetylpyridine and 1,2-diaminoethane, was also characterized by single crystal X-ray structure analysis. The crystal packing is stabilized by intermolecular H-bonding and $pi$ − $pi$ interactions.

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