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Synthesis and characterization of mixed-ligand ruthenium(III) complexes with oxalate and acetylacetonate ions |
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| Authors: | Yoshimasa Hoshino Motoki Eto Yasuhiko Yukawa Akira Endo GP Satô |
| Institution: | a Department of Chemistry, Faculty of Education, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan b Graduate School of Science and Technology, Niigata University, 8050 Ikarashi Nino-cho, Niigata 950-2181, Japan c Department of Environmental Science, Faculty of Science, Niigata University, 8050 Ikarashi Nino-cho, Niigata 950-2181, Japan d Department of Chemistry, Faculty of Science and Technology, Sophia University, Kioicho 7-1, Chiyoda-ku, Tokyo 102-8554, Japan |
| Abstract: | Two mononuclear mixed-ligand ruthenium(III) complexes with oxalate dianion (ox2−) and acetylacetonate ion (2,4-pentanedionate, acac−), K2Ru(ox)2(acac)] (1) and KRu(ox)(acac)2] (2), were prepared as a candidate for a building block. In fact, reaction of complex 2 with manganese(II) sulfate gave a heterometallic tetranuclear complex, TBAMnII{(μ-ox)RuIII(acac)2}3] (5) in the presence of tetrabutylammonium (TBA) bromide. The 1H NMR, UV-Vis, selected IR and FAB mass spectral data of these complexes are presented. Both mixed-ligand ruthenium(III) complexes gave a Nernstian one-electron reduction step in 0.1 mol dm−3 Na2SO4 aqueous solution on a mercury electrode at 25 °C. Comparison of observed reversible half-wave potentials with calculated values for a series of Ru(ox)n(acac)3 − n]n− (n=0-3) complexes by using Lever’s ligand electrochemical parameters is presented. |
| Keywords: | Ruthenium complexes Oxalato complexes Tetranuclear complexes Mixed-ligand complexes Electrochemistry Ligand electrochemical parameters |
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