Synthesis and characterization of a new ruthenium complex, [Ru(acac)2(mhmk)] (1) with coordinated β-ketiminate ligand are described. The complex has been obtained by the reaction of acetone on coordinated acetonirile in [Ru(acac)2(CH3CN)2], the first such reaction to be observed. X-ray structure of 1 is similar to that of [Ru(acac)3]. Cyclic voltammetric studies of 1 show a negative shift for both reduction and oxidation indicating that there is large electron density on ruthenium containing β-ketiminate ligand when compared to ruthenium containing only β-diketonato ligands, [Ru(acac)3].

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