A Novel Tetra Nuclear Ruthenium Complex Containing Deltoid Core Topology, [Ru4(μ3-O)2]8+, Incorporating Simultaneous O,O- and γ-C Bonded Bridging Acetylacetone Units

Abstract

The reflux of mononuclear ruthenium precursor [RuII(acac)2(CH3CN)2] (acac = acetylacetonate) in 2-methyl-2-propanol formed the novel diamagnetic β-diketonato ruthenium tetranuclear complex [Ru(μ-acac)2(μ3-O)2Ru3(acac)6] (1), in which was contained the deltoid core, [Ru4(μ3-O)2]8+, consisting of four ruthenium and two oxygen atoms. The complex 1 has been characterized on the basis of elemental analysis, 1H NMR, structural and cyclic voltammetric analyses. The molecular structure of 1 showed that each ruthenium ion was bridged by two oxygen atoms and two ruthenium ions link to γ-carbon on acetylacetonate coordinated to another ruthenium. The cyclic voltammogram of 1 showed two reversible one-electron oxidation peaks and an one-electron reduction peak corresponding to the redox of [Ru4(μ3-O)2]8+ core.

Acidic Ruthenium PNNP Complexes of Non-enolized 1,3-Dicarbonyl Compounds as Catalysts for Asymmetric Michael Addition

“…Although it is not the desired product, 6 will be discussed here because it is a rare example of a ruthenium complex containing a non-ionized carboxylic acid and, more importantly, a useful model for 2a . To the best of our knowledge, there are no structural data of ruthenium complexes that contain non-enolized β-keto esters, the closest analogues being complexes featuring a weakly C-bound acetylacetonato ligand …”

Syntheses, Crystal Structures and Electrochemical Properties of Acetylacetonato-Ruthenium Complexes Containing Substituted Pyridine Ligands

“…The reaction of Ru(acac) 3 with an excess of diene in the presence of zinc as reducing agent afforded a series of pseudooctahedral Ru(acac) 2 (diene) complexes [6]. The reflux of [Ru II (acac) 2 (CH 3 CN) 2 ] in 2-methyl-2-propanol gave the novel diamagnetic tetranuclear β -diketonato ruthenium complex [Ru(µ-acac) 2 (µ 3 -O) 2 Ru 3 (acac) 6 ] [15]. Alcoholic solutions of Ru(acac) 3 were saturated by bubbling CO under radiolysis, leading to the isolation of the ruthenium(II) carbonyl complexes [Ru(acac) 2 (CO)L] (L = MeOH, EtOH or iPrOH) in which the alcohol molecules are readily displaced by stronger donors [16].…”