Reaction of Acetone on Coodinated Nitrile in β-Diketonato Ruthenium Complex, [Ru(acac)2(CH3CN)2] with the formation of β-Ketiminate

Abstract

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].

Synthesis, spectroscopic characterization and catalytic oxidation properties of ONO/ONS donor Schiff base ruthenium(III) complexes containing PPh3/AsPh3

“…This can be explained by the fact that the additional phenyl ring, by its electron withdrawing nature decreases the electron density around the metal centre. 26 There is no variation in the redox potential of the complexes due to the replacement of triphenylphosphine by triphenylarsine. 19 Our attempts to grow crystals suitable for X-ray structural determination were unsuccessful.…”

17 The noble metals

“…30 The reactivity of coordinated nitriles has been extended by finding that [Ru(acac) 2 (NCMe) 2 ] reacts with acetone to give the ketiminate complex [Ru(acac) 2 (OCMeLCH-CMeLNH)]. 31 Reaction 2 ) 2 }] 1 . The complex is a spin-triplet 14-valence electron species with two singly occupied d-orbitals on Ru.…”

“…89 Using 4,4'-diphenyl-2,2'-bipyridyl (L) and L 11 to make [RuL 2 (L 11 )] 21 and linking this to [Os(terpy) 2 ] 21 allowed the strong photosensitizing ability of L to give enhanced Os-centred emission. 90 31 , in which the now biimidazolate dianions each chelate a Pd atom. 91 Turning to osmium's organometallic chemistry, fluorination of [Os 3 (CO) 12 ] in HF/ SbF 5 gave cis-[Os(FSbF 5 ) 2 (CO) 4 ].…”

“…Carrying out this process in water led to the formation of an aqua-chlorocomplex. 100 Continued studies on the ability of Rh(III) quinine diimine (L) complexes to suppress replication of cancer cells involved studies of [RhL 2 (phen)] 31 , which raise the melting point of a 15-mer DNA structure by up to 21 uC and are more effective than [RhL(phen) 2 ] 31 . Similar results were found for Ru(II) analogues.…”

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

“…From the view point of synthetic chemistry, Ru(acac) 3 has proven to be a versatile precursor for a variety of organometallic complexes [3−6]. For example, catalytic hydrogen reduction of Ru(acac) 3 gave the diacetonitrile-bis(β -diketonato)ruthenium(II) complex [Ru II (acac) 2 (CH 3 CN) 2 ] [7]; the acetonitrile ligands of the resulting species could be substituted by more electron-donating ligands, e. g., phosphines [8,9], pyridine [10−12], o-aminoquinone [13], and β -ketiminates [14]. 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].…”