摘要:
The reactions of [Ru(acac)(2)(CH3CN)(2)] with four ketones (acetone, ethyl methyl ketone, acetylacetone and monochloroacetone), and the reactions of [Ru(acac)(2)(C6H5CN)(2)] with two ketones (acetone and ethyl methyl ketone) yielded six novel compounds of beta-ketiminato ruthenium complexes: [Ru(acac)(2)(mhmk)], [Ru(acac)(2)(ehmk)], [Ru(acac)(2)(mAmk)], [Ru(acac)(2)(MClmk)], [Ru(acac)(2)(mhbk)], and [Ru(acac)(2)(ehbk)] (mhmk = 4-iminopentane-2-one mono anion, ehmk = 5-iminohexane-3-one mono anion, mAmk = 3-(1-iminoethyl)-2,4-pentanedione mono anion, mClmk = 3-chloro-4-imino-pentane-2-one mono anion, mhbk = 1-phenyl-1-iminobutane-3-one mono anion, mhbk = 1-phenyl-l-iminopentane-3-one mono anion). All the new complexes have been characterized by elemental analyses, H-1 NMR, MS and electronic spectral data. Crystal and molecular structures for the six beta-ketimine complexes have been solved by single crystal X-ray diffraction studies. A mechanism involving the attack of ketones on the coordinated nitrile has been proposed. The electrochemical redox behavior of the beta-ketimine complexes has been elucidated. (c) 2005 Elsevier B.V. All rights reserved.