Ruthenium Complexes of the Scorpionate Ligand Bis(3,5‐dimethylpyrazol‐1‐yl)dithioacetate and the Effect of Nitric Oxide Coordination

Abstract

Six new ruthenium(II) complexes with the scorpionateligand bis(3,5‐dimethylpyrazol‐1‐yl)dithio‐κ3N,N,S‐acetate (bdmpzdta) were obtained by treatment of the ligand with RuCl3 or [RuCl3(NO)] in 1:1 or 2:1 molar ratios in the presence or absence of ethylenediamine. In all six complexes the pyrazolic rings lie in the equatorial plane. The mononitrosyl complexes present a sharp ν(NO) band in the range 1864–1859 cm–1 for samples prepared either as KBr tablets or dichloromethane solutions. In the case of [Ru(NO)(bdmpzdta)2]Cl (7), the dithiocarboxylate group of one of the ligands is not coordinated (κ2N,N). In the other five complexes, however, bdmpzdta behaves as a κ3N,N,S scorpionate ligand. When the complexes obtained from RuCl3 were dissolved in dichloromethane and NO was bubbled through the solution, a high degree of coordination of NO+ was observed, according to IR, UV and voltammetric studies. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

A ruthenium(II) complex with bis(3,5-dimethylpyrazol-1-yl)dithioacetate built layer-by-layer on silver and gold surfaces

“…1 These nanoparticles exhibited the maximum of the surface plasmon resonance at 530 nm indicating the formation of nanoparticles with diameters within 15-20 nm. These nanoparticles in DMSO resulted to be EPR silent indicating the presence of only Ru(II), the same oxidation state in the complexes previously reported [1].…”

“…These compounds were obtained by the interaction of the ligand with RuCl 3 and [RuCl 3 (NO)] in 1:1 or 2:1 molar ratios in the presence or absence of ethylenediamine [1]. The complexes obtained from RuCl 3 showed a high affinity for nitric oxide (NO), one of the most important radicals in biological systems [2].…”

Two New Imidazole‐Based Heteroscorpionate Ligands

“…Similar to the complexes reported by Cao and co-workers this should result in a significant high field shift of the CS 2 -moiety in the 13 C{ 1 H} NMR spectrum. [15] Indeed the CS 2 -carbon atom of the coordinated ligand appears at δ = 237.6 ppm, that of the uncoordinated ligand at δ = 249.1 ppm. But due to either the lability or insolubility of the complex in common organic solvents except CH 2 Cl 2 and CHCl 3 and the insolubility of the ligand Li[bmidta] in the very same solvents, a direct comparison of the NMR spectroscopic data was not possible.…”

The first P–N containing RuCl3NO complex: fac-[RuCl3(NO)(P–N)] (P–N=[o-(N,N-dimethylamino)phenyl]diphenylphosphine)

“…The synthesis of nitrosyl containing ruthenium complexes is focused mainly on traditional ligands, such as pyridines and amines [4][5][6].…”