Abstract
Recently a variety of monoand dinuclear metal carbonyl DAB complexes (DAB = 1,4-diazabutadiene = crdiimine) have been prepared and the electronic and spectroscopic properties investigated [l-6]. In almost all complexes the DAB ligand is u, acoordinated to the metal carbonyl fragment via the two lone pairs on nitrogen. Only one example has been reported where the nelectrons were involved in the metal-to-ligand bonding [7], while for some reactions of coordinated DAB ligands R-coordinated intermediates were assumed [8]. In this preliminary paper on ruthenium carbonyl DAB complexes, the earlier assumption that ncoordination is very important for the activation of the C=N double bond will be shown to be correct. Ruthenium carbonyl reacts with DAB ligands according to equation (1).
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