Ruthenium(II) phenolates. Synthesis and characterization of a novel four-membered metallacycle

Abstract

Ruthenium(II) Phenolates. Synthesis and Characterization of A Novel Four-Membered Metallacycle Ruthenium phenolates constitute a small family of interesting complexes.1 While 4-methy!-2,6-diformylphenol (1) was studied as a potential binucleating ligand for the metal, complexes of composition Ru(/?-XC6H4L)(CO)(PPh3)2Cl, incorporating 2, were discovered. The X = Me complex 3, described here, is representative of the family.2 Reaction of Ru(PPh3)3Cl2 (100 mg, 0.10 mmol), 1 (26 mg, 0.15 mmol), and p-MeC6H4NH2 (17 mg, 0.15 mmol) in boiling ethanol (30 mL) for 0.5 h (the reaction does not proceed in the absence of the amine) affords a violet solution, which, upon cooling, deposits 3 as dark violet crystals in nearly quantitative yield.3 The same results are obtained when 1 + />MeC6H4NH2 is replaced by an equivalent amount of the preformed Schiff base 4 (40 mg, 0.15 mmol), which is thus the active reagent in the synthesis. Benzene can replace ethanol as the solvent without loss of synthetic efficacy.The X-ray structure4,5 of 3 is shown in Figure 1. The ru-

Ruthenium dithiophosphates: synthesis, X-ray crystal structure, spectroscopic and electrochemical properties

“…3). Since the ruthenium ion is in the q4 oxidation state in the complexes, the bands may therefore be assigned as ligand to metal charge-transfer transitions from sulfur to the metal ion [48][49][50][51][52]. The direct comparisons of the solid state reflectance spectra of 1 with the solution absorption spectra (Fig.…”

Synthesis, characterization and photophysical properties of quinolin-8-olato chelated osmium(II) organometallics bearing a pendant imine-phenol motif and electrogeneration of trivalent analogue

“…It was demonstrated that the decarbonylative metallation of 4-methyl-2,6-diformyl phenol by M(PPh 3 ) 3 X 2 in the presence of primary aromatic amines (RC 6 H 4 NH 2 ) is known to furnish four-membered ruthenium/osmium organometallics of the type M(RL 1 )(PPh 3 ) 2 (CO)X (1) juxtaposed to a hydrogen bonded iminium-phenolato function [17][18][19]. We are scrutinizing the reactivity of these compounds.…”

Structure-dependent in vitro cytotoxicity of the isomeric complexes [Ru(L)2Cl2] (L=o-tolylazopyridine and 4-methyl-2-phenylazopyridine) in comparison to [Ru(azpy)2Cl2]

“…Although methylated azpy ligands have already been described [9,13,14], no X-ray structure determinations of dichlorobis(methylazpy)ruthenium(II)complexes with tazpy or mazpy ligands have been reported yet. To our knowledge, the only molecular structure of a bis-chelated ruthenium complex with a methylated azpy ligand is of the compound catecholatobis(2-(m-tolylazo)pyridine)ruthenium (II) [15]. The ligand 4-methyl-2-phenylazopyridine has been shown to be associated in molybdenum and iron complexes [16,17].…”