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Syntheses, structures, and reactivities of novel binuclear ruthenium(II) complexes with bis(-phosphinato) bridges

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Novel binuclear ruthenium(II) complexes with bis(-phosphinato-O:O') bridges, [Ru(dpp)(bpy)2]2(BF4)2 (1), [Ru(bmp)(bpy)2]2(BF4)2 (2) (Hdpp = diphenylphosphinic acid, Hbmp = bis(4-methoxyphenyl)phosphinic acid, bpy = 2,2'-bipyridine), have been prepared and characterized. The structures of 1 and 2 contain a diruthenium(II) core with two phosphinates and four bpy ligands. These are the first reported examples of such Ru(II) phosphinate structures. Oxidation of cinnamyl alcohol by molecular oxygen was carried out using 1 and 2 as catalysts and as an oxidant. In the presence of 2, cinnamyl alcohol gave cinnamaldehyde (44% in 7 h). In CV, two reversible waves at +0.31, +0.59 V for 1 and +0.27, +0.54 V for 2 were observed.
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Keywords: Binuclear complex; Crystal structure; Phosphinato bridge; Reactivity; Ruthenium(II)

Document Type: Research Article

Affiliations: Faculty of Science and Engineering, Department of Chemistry and Applied Chemistry, Saga University, Saga 840-8502, Japan

Publication date: January 1, 2007

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