General Synthesis of (Salen)ruthenium(III) Complexes via N···N Coupling of (Salen)ruthenium(VI) Nitrides

Abstract

Reaction of [Ru (VI)(N)(L (1))(MeOH)] (+) (L (1) = N, N'-bis(salicylidene)- o-cyclohexylenediamine dianion) with excess pyridine in CH 3CN produces [Ru (III)(L (1))(py) 2] (+) and N 2. The proposed mechanism involves initial equilibrium formation of [Ru (VI)(N)(L (1))(py)] (+), which undergoes rapid N...N coupling to produce [(py)(L (1))Ru (III) N N-Ru (III)(L (1))(py)] (2+); this is followed by pyridine substituion to give the final product. This ligand-induced N...N coupling of Ru (VI)N is utilized in the preparation of a series of new ruthenium(III) salen complexes, [Ru (III)(L)(X) 2] (+/-) (L = salen ligand; X = H 2O, 1-MeIm, py, Me 2SO, PhNH 2, ( t )BuNH 2, Cl (-) or CN (-)). The structures of [Ru (III)(L (1))(NH 2Ph) 2](PF 6) ( 6), K[Ru (III)(L (1))(CN) 2] ( 9), [Ru (III)(L (2))(NCCH 3) 2][Au (I)(CN) 2] ( 11) (L (2) = N, N'-bis(salicylidene)- o-phenylenediamine dianion) and [N ( n )Bu 4][Ru (III)(L (3))Cl 2] ( 12) (L (3) = N, N'-bis(salicylidene)ethylenediamine dianion) have been determined by X-ray crystallography.

A Simple Biosynthesis of Silver Nanoparticles from Syzygium cumini Stem Bark Aqueous Extract and their Spectrochemical and Antimicrobial Studies

“…The statistical analysis data is described in Figure 8 and it gives the variation of ZoI in both Escherichia coli, Bacillus subtilis. The antibacterial activity is in all likelihood derived through the electrostatic attentiveness between negative charged cell membrane of microorganism and positive charged NPs (Dhermendra et al, 2008;Matela et al, 2013). The antibacterial potency of the biogenic SNs reported in the present retrospection may be attributed to the mechanism described above.…”

“…These zones were developed against both gram positive (Bacillus subtilis) and gram negative (Escherichia coli); it was interestingly note that Escherichia coli with thin cell wall are more susceptible to cell wall damage then Bacillus subtilis with thick cell wall by SNs (Ruparelia et al, 2008). Similarly bacterial cell wall damage depends upon the strain of microorganisms used (Matela et al, 2013). So, in the present case, Escherichia coli showed a better activity than Bacillus subtilis towards green synthesized SNs.…”

“…Allocation of particle size by magnitude gives a spherical shaped group. In an earlier study, SNs size distributions were obtained in the range of 18.03 nm to 148.7 nm by using Saururus chinensis leaf extract (Morones et al, 2005).…”

Reactivity of Nitrido Complexes of Ruthenium(VI), Osmium(VI), and Manganese(V) Bearing Schiff Base and Simple Anionic Ligands

“…XXX, No. XX ' XXXX ' 000-000 ' ACCOUNTS OF CHEMICAL RESEARCH ' C Reactivity of Nitrido Complexes Man et alreaction should occur with Ru VI ÀRu VI , as shown in eqs 4 and 5 (L = salchda ligand) 31,32. …”

Ligand‐Accelerated Activation of Strong CH Bonds of Alkanes by a (Salen)ruthenium(VI)–Nitrido Complex

“…[11] However, py also activates 1 toward bimolecular coupling of the nitrido ligands. [12] Hence, we studied the reaction of 1/py with alkanes under conditions of high dilution using a 50 mm cuvette in order to minimize this coupling reaction. Figure 1 shows the spectrophotometric changes for the reaction of 1 with cyclohexane in the presence of excess py in (CH 2 Cl) 2 .…”