Ru Molar Ratio Research Articles

Ru dispersed on CeO2{1 0 0} facets boosting the catalytic NH3 decomposition for green H2 generation

A hydrothermal process was used to prepare CeO2 nanoparticles with mainly {100} facets and {110,100} facets, and a precipitation method was used to prepare CeO2 nanoparticles with mainly {111,100} facets for supporting Ru in NH3 decomposition studies. CeO2{100} promoted the formation of partially charged Ru (Ruδ+) species over Ru/CeO2{100}, leading Ru/CeO2{100} to perform the highest NH3 decomposition activity by desorbing re-combinative N2 efficiently. Density functional theory calculations have confirmed the Ru dispersed on terminated CeO2{100} with the high negative Bader charges for decreasing the formation energy of N2. In addition, the Cs addition significantly promotes the catalytic activity, with the optimal molar ratio of Ru observed at 1:1. 1.0Cs-Ru/CeO2{100} exhibited superior catalytic activity and durability compared to the others. This study proves that CeO2{100} can improve the electron donation to Ru, which is essential for enhancing N2 re-combinative desorption to elevate the NH3 decomposition activity.

Investigating the influence of Ru structures and supports on hydrogenolysis of polyethylene plastic waste

The Ru dispersion of Ru/SBA-15 was controlled by varying the triethanolamine (TEA)/Ru molar ratios to examine the influence of Ru structures on the hydrogenolysis of low-density polyethylene (LDPE) under moderate conditions (3 MPa hydrogen and 250 °C). Among the different Ru catalysts tested, Ru/SBA-15 with a TEA/Ru molar ratio of 10 (Ru/SBA-15 (10)) exhibited the best activity in LDPE hydrogenolysis. Analyses, including X-ray diffraction (XRD), CO chemisorption, CO Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and High-angle annular dark-field-scanning transmission electron microscopy (HAADF-STEM) showed that the optimal amount of TEA (TEA/Ru = 10) increased the Ru dispersion (92%) and ultimately improved the catalytic activity of LDPE hydrogenolysis. The addition of TEA led to the formation of a [Ru(triethanolamine)2]3+ complex, which facilitated the introduction of Ru species into the confined space in SBA-15. The highly dispersed Ru species confined within SBA-15 in Ru/SBA-15 (10), along with the inherent properties of SBA-15, results in increased hydrogen coverage on the Ru species. This increase in hydrogen coverage leads to a higher liquid yield in LDPE hydrogenolysis compared to Ru/SiO2 (10). Additionally, we successfully employed Ru/SBA-15 (10) in the hydrogenolysis of postconsumer polyolefin waste, including commercial LDPE and LDPE bottles, producing valuable chemicals, such as liquid fuel and wax, in high yields of 65–70%.

Photocoupled Electroreduction of CO2 over Photosensitizer-Decorated Covalent Organic Frameworks.

Introducing an external visible-light field would be a promising strategy to improve the activity of the electrocatalytic CO2 reduction reaction (CO2RR), but it still remains a challenge due to the short excited-state lifetime of active sites. Herein, Ru(bpy)3Cl2 struts as powerful photosensitive donors were immobilized into the backbones of Co-porphyrin-based covalent organic frameworks (named Co-Bpy-COF-Rux, x is the molar ratio of Ru and Co species, x = 1/2 and 2/3) via coordination bonds, for the photo-coupled CO2RR to produce CO. The optimal Co-Bpy-COF-Ru1/2 displays a high CO Faradaic efficiency of 96.7% at -0.7 V vs reversible hydrogen electrode (RHE) and a CO partial current density of 16.27 mA cm-2 at -1.1 V vs RHE under the assistance of light, both of which were far surpassing the values observed in the dark. The significantly enhanced activity is mainly attributed to the incorporation of a Ru(bpy)3Cl2 donor with long excited-state lifetime and concomitantly giant built-in electric field in Co-Bpy-COF-Ru1/2, which efficiently accelerate the photo-induced electron transfer from Ru(bpy)3Cl2 to the cobalt-porphyrin under the external light. Thus, the cobalt-porphyrin active sites have a longer excited-state lifetime to lower the rate-determining steps' energy occurring during the actual photo-coupled electrocatalytic CO2RR process. This is the first work of porphyrin-based COFs for photo-coupled CO2RR, opening a new frontier for the construction of efficient photo-coupled electrocatalysts.

Effect of the Modifier on the Catalytic Properties and Thermal Stability of Ru–Cs(Ba)/Sibunit Catalyst for Ammonia Decomposition

Based on the Sibunit carbon composite, Ru–Cs(Ba)/Sibunit catalysts with Cs(Ba) : Ru molar ratios of 0.5, 1.5, and 2.5 were obtained. The catalytic activity of the obtained promoted catalysts in the decomposition of ammonia and their thermal resistance to methanation are compared. In the reaction of ammonia decomposition, the specific activity (Wsp) of barium-containing catalysts proved to be 2 times lower than the specific activity of cesium-containing samples with the same molar M : Ru ratio. Thus, Wsp at 500°С was 29.4 mmol H2 min–1 for 0.5Cs–Ru/Sibunit and 15.4 mmol H2 g–1cat min–1 for 0.5Ba–Ru/Sibunit. It was shown that the introduction of barium at molar ratios Ba : Ru = of 0.5–2.5 significantly increases the thermal stability of the samples defined as the ratio of the weight of hydrogen obtained on the catalyst to the weight of carbon subjected to methanation. There is 52 g H2 for nonpromoted Ru/Sibunit catalyst, 370 g H2 for the 0.5Ba–Ru/Sibunit sample, 200 g H2 for the 1.5Ba–Ru/Sibunit sample, and 150 g H2 for the 2.5Ba–Ru/Sibunit sample per 1 g of carbon loss.

Synthesis and spectroscopic studies of levofloxacin uni-dentate complexes of Ru(II), Pt(IV) and Ir(III): Third generation of quinolone antibiotic drug complexes

The monobasic unidentate levofloxacin (LEV; (S)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methylpiperazin-1-yl)-7-oxo-7H-pyrido[1,2,3-de]-1,4―benzoxazine-6-carboxylic acid) complexes of Ru(III), Pt(IV) and Ir(III) were prepared and well discussed using elemental analyses (CHN), molar conductance, infrared, electronic, effective magnetic moment, 1H-NMR, X-ray powder diffraction, scanning electron microscopy, transmittance electron microscopy and thermogravimetric (TG/DTG) analyses. The IR and electronic spectra of LEV complexes with their assignments were discussed in details which were confirmed that LEV is binding to the metal ions as a neutral unidentate ligand through the nitrogen atom of 4-methylpiperazin-1-yl moiety. The molar ratio of Ru(III) and Ir(III) chelates is 1:3 (Metal: LEV), while Pt(IV) complex has a 1:2M ratio. The general formulas of LEV complexes have been designed as [M(L)n(Cl)x]·yH2O ((1) M=Ru3+, L: LEV, n=3, x=3, y=8; (2) M=Pt4+, L: LEV, n=2, x=4, y=4 and (3) M=Ir3+, L: LEV, n=3, x=3, y=6. The X-ray powder diffraction was used as technique to estimate the particle size of LEV complexes. Thermogravimetric analysis (TG-DTG) was utilized to identify the presence of coordinated, uncoordinated water molecules, mass losses and residual products.

Synthesis, structural, and electrical characterization of RuO2 sol–gel spin-coating nano-films

In this work a series of RuO2 thin films were synthesized through sol–gel spin coating processes and their structural and electrical properties are studied. The (1 1 0), (1 0 1), (2 0 0), and (2 1 1) characteristic peaks of RuO2 phase are identified from the annealed RuO2 films X-ray diffraction profiles. Through the Atomic Force Microscopy, the surface roughness values of the films evaluated as 1.2 nm, and 0.9 nm for 0.5, and 1.0 mmol RuO2 films, respectively. With Ru molar ratio increment the optical transparency of the synthesized films decreases in the UV–Vis-IR range. The P-type conductivity of RuO2 film is confirmed by Hall Effect measurement and the resistivity of 1.0 mmol RuO2 film annealed at 600 °C acquired by Hall measurement was 2.9 × 10−4 Ω cm. The synthesized RuO2 nano-thin films characterization demonstrates that an optically transparent conductive material can be reliably and efficiently created using simple sol–gel spin-coating methods.

Combined Macroscopic, Nanoscopic, and Atomic‐Scale Characterization of Gold–Ruthenium Bimetallic Catalysts for Octanol Oxidation

A series of gold–ruthenium bimetallic catalysts of increasing Au:Ru molar ratios supported on a Ce0.62Zr0.38O2 mixed oxide are prepared and their structural and chemical features characterized by a combination of macroscopic and atomic‐scale techniques based on scanning transmission electron microscopy. The influence of the temperature of the final reduction treatment used as activation step (350–700 °C range) is also investigated. The preparation method used allows catalysts to be successfully prepared where a major fraction of the metal nanoparticles is in the size range below 5 nm. The structural complexities characteristic of this type of catalysts are evidenced, as well as the capabilities and limitations of both the macroscopic and microscopic techniques in the characterization of the system of metal nanoparticles. A positive influence of the addition of Ru on both the resistance against sintering and the catalytic performance of the starting supported Au catalyst is evidenced.

Synthesis of higher alcohols from CO2 hydrogenation over a PtRu/Fe2O3 catalyst under supercritical condition.

Hydrogenation of CO(2) to alcohols is of great importance, especially when producing higher alcohols. In this work, we synthesized heterogeneous PtRu/Fe(2)O(3), in which the Pt and Ru bimetallic catalysts were supported on Fe(2)O(3). The catalyst was used to catalyse CO(2) hydrogenation to alcohols. It was demonstrated that the activity and selectivity could be tuned by the bimetallic composition, and the catalyst with a Pt to Ru molar ratio of 1:2 (Pt(1)Ru(2)/Fe(2)O(3)) had high activity and selectivity at 200°C, which is very low for heterogeneous hydrogenation of CO(2) to produce higher alcohols. The conversion and the selectivity increased with increasing pressures of CO(2) and/or H(2). The catalyst could be reused at least five times without any obvious change in activity or selectivity.

Investigation of PtCo/Graphene and PtCoRu/Graphene Catalysts for Oxygen Reduction Reaction

The electrocatalytic oxygen reduction reaction (ORR) is an important process in energy converting systems such as low temperature proton exchange membrane fuel cells (PEMFCs). Therefore, understanding the oxygen reduction mechanistic pathways in terms of developing an efficient and stable catalyst has been the main research interest over several decades. In the present study a rapid microwave heating method was used to prepare the graphene supported PtCo and PtCoRu catalysts with the different Pt:Co and Pt:Co:Ru molar ratios. The catalytic activity of the PtCo/graphene and PtCoRu/graphene catalysts, for oxygen reduction reaction was investigated by linear scan voltammetry in the cathodic direction at 5 mV s–1 in the 0.5 M H2SO4 solution saturated with O2 at a temperature of 25 oC. Physical characterization of the catalysts was performed by X-ray Diffraction, High Resolution Transmission Electron Microscopy, Energy Dispersive X-ray Analysis and Inductively Coupled Plasma Optical Emission Spectroscopy techniques. The cyclic voltammetry has been used to estimate the electrochemically active surface areas of the catalysts. It was found that the PtCo/graphene and PtCoRu/graphene catalysts prepared by means of microwave synthesis show enhanced activity towards oxygen reduction as compared with that at bare Pt/graphene catalyst. The PtCo/graphene and PtCo /graphene catalysts show higher onset potentials, as well as higher current densities towards oxygen reduction reaction as compared with those at the bare Pt/graphene catalyst.

Ru-modified Au catalysts supported on ceria–zirconia for the selective oxidation of glycerol

In the present work, a series of supported gold–ruthenium bimetallic catalysts of varying Au:Ru molar ratios were prepared onto ceria–zirconium mixed oxide (Ce0.62Zr0.38O2) using sequentially deposition-precipitation and impregnation techniques to add gold and ruthenium, respectively. A combination of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) analyses and different transmission electron microscopy techniques as high-resolution transmission electron microscopy (HRTEM), high-angle annular field imaging (HAADF-STEM) and X-ray energy-dispersive spectroscopy (XEDS) were used to characterize the bimetallic catalysts, being their catalytic behaviour tested in the selective oxidation of glycerol to glyceric acid. The analytical electron microscopy results of the bimetallic catalysts are consistent with the low miscibility gap reported between gold and ruthenium in the bulk state. Nevertheless, detailed STEM-XEDS analyses of individual particles provided evidence that both metals display certain tendency to form bimetallic particles. For the glycerol oxidation, the Au:Ru molar ratio is a key parameter to achieve optimal catalytic performance, i.e. the supported bimetallic catalyst with 1Au:0.5Ru ratio was found to be several times more active than monometallic gold and ruthenium catalysts. Furthermore, studies on bimetallic catalyst reduced at increasing temperatures confirm that the presence of small amounts of ruthenium prevents the aggregation of gold particles. These structural findings strongly suggest that if this increased stability is kept under reaction conditions, this could be one of the key factors to explain its exceptional activity.

Hydrogenation of succinic acid to 1,4-butanediol over Re–Ru bimetallic catalysts supported on mesoporous carbon

A series of Re–Ru bimetallic catalysts supported on mesoporous carbon (denoted as (0.6−x)Re–xRu/MC) were prepared by a single-step surfactant-templating method and a subsequent incipient wetness impregnation method with a variation of ruthenium loading (x, mol%), and they were applied to the liquid-phase hydrogenation of succinic acid to 1,4-butanediol (BDO). The effect of metal content on the catalytic activities and physicochemical properties of (0.6−x)Re–xRu/MC catalysts was investigated. It was found that a Re–Ru miscible phase was formed in the catalysts during the reduction process, and it was responsible for strong interaction between rhenium and ruthenium. It was also revealed that reducibility, metal dispersion, and oxidation state of (0.6−x)Re–xRu/MC catalysts were affected by Re:Ru molar ratio. In particular, the oxidation state was closely related to the hydrogen adsorption behavior of the catalysts. The amount of weak hydrogen-binding sites increased with increasing the ratios of metallic rhenium (Re0) and ruthenium (Ru0) with respect to total metallic species in the reduced (0.6−x)Re–xRu/MC catalysts. Catalytic performance in the hydrogenation of succinic acid to BDO over (0.6−x)Re–xRu/MC showed a volcano-shaped trend with respect to Re:Ru molar ratio. This result was well correlated with the amount of weak hydrogen-binding sites of the catalysts. Among the catalysts tested, 0.3Re–0.3Ru/MC with the largest amount of weak hydrogen-binding sites showed the best catalytic performance in the BDO production by hydrogenation of succinic acid.

Synthesis, X-ray structure analysis and density functional study of an unusual anhydrous 5,6-dimethylbenzo-1,3-imidazolium(H3) chloride

The heteroaromatic base 5,6-dimethylbenzo-1,3-imidazole (DMBI) proved to be a Brönsted base in an anhydrous ethanol solution, which contained fac,trans-[Ru(CO)3Cl2]2 at 55°C in air when the DMBI:Ru molar ratio was 2:1. The reaction produced colorless anhydrous single crystals of {(HDMBI)+Cl−}, C9H11ClN2, which were collected and analyzed using X-ray diffraction (XRD) techniques. A network of N–H⋯Cl hydrogen bond type interactions linking the protonated hetero-aromatic base to the chloride anions (bridging bases) stabilizes the crystal and mimics the N–H⋯Cl− interactions that play important roles in CCl channel biological systems. The shortest N⋯Cl contact distance and corresponding N–H⋯Cl angle are 3.073(3)Å and 173(3)°, respectively. The packing is also assisted by weaker C–H⋯Cl− hydrogen bond-type interactions and an extensive network of π⋯π stacking interactions involving HDMBI+ cations. Density functional calculations at the B3LYP/6-31G∗∗ and /6-311++G∗∗ levels for models of fragments of the crystal structure allowed for the evaluation of geometric parameters, hydrogen bond-type interaction formation energies, and infrared parameters for {(HDMBI)+Cl−} and {(HDMBI)+⋯Cl−⋯(HDMBI)+}.

PVP-stabilized mono- and bimetallic Ru nanoparticles for selective ring opening

Selective ring opening of naphthenic molecules in oil upgrading should result in no loss in molecular weight. Benzocyclopentane (indan) ring opening was studied under hydrogen atmospheric pressure at 609 K over poly-(vinylpyrrolidone)-stabilized Ru, Ir and Pd monometallic and Ru–Ir and Ru–Pd bimetallic nanocatalysts prepared by simultaneous reductions. The particle size (mostly within 2 nm) and their monodispersity were confirmed by transmission electron microscopy, while X-ray photoelectron spectroscopy indicated the bimetallics' alloy structure. Pd catalysts displayed the lowest activity in the ring opening; Ru showed the highest formation of undesired o-xylene and lights. Monometallic Ir displayed the highest activity and selectivity toward 2-ethyltoluene and n-propylbenzene. In bimetallic structures, higher Ir content led to improved catalytic performance. Next to the monometallic Ir catalyst, the newly developed Ru1Ir4/γ-Al2O3 catalyst (with 1 : 4 molar ratio of Ru to Ir) displayed superior single cleavage selectivity as well as lower cracking activity compared to industrial Pt–Ir catalysts at a comparable indan conversion. The study can pave the way in the development of Pt-free Ru-containing catalysts with narrow size distributions for selective ring opening, especially taking into consideration a possibility of their higher S-resistance as compared to the Pt catalysts.

Selective oxidation of methane into synthesis gas at short contact times on low-loading platinum-ruthenium catalysts

The results of the study of Pt-Ru/2% Ce/(θ + α)-Al2O3 catalysts with various Pt/Ru ratios used in the process of selective methane oxidation into synthesis gas at short contact times are presented. The optimal catalyst preparation conditions have been found for the process. It has been revealed that the methane conversion at 1173 K and a contact time of 4.0-3.0 ms varies from 96 to 100% and the selectivities for hydrogen and CO are 100 and 95–100%, respectively. At a Pt: Ru molar ratio of 2: 1 or 1: 1 and τ = 3.5 ms, the maximum (100%) degree of the conversion of methane into synthesis gas via the direct route is observed; the selectivity for H2 and CO is 100%, and the total content of the noble metals is O ≥ 0.2%.

Dual Visible and Near-Infrared Luminescent Silica Nanoparticles. Synthesis and Aggregation Stability

Novel silica nanoparticles exhibiting near-infrared (NIR) and dual NIR-visible emission were synthesized according to reverse microemulsion procedure through the encapsulation of Yb(III) complex with p-sulfonatothiacalix[4]arene (Yb) and [Ru(dipy)3]Cl2 (Ru) as NIR- and visible-emitting luminophores into silica matrix. The synthesis was carried out at various Yb:Ru molar ratio. The numbers of Ru and Yb complexes per one nanoparticle were calculated from both fluorimetric and inductively coupled plasma atomic emission spectroscopy data. The dynamic light scattering measurements of aqueous dispersions of Yb, Ru, and Ru−Yb nanoparticles elucidate the relationship between the complexes inserted into nanoparticles and their aqueous dispersity. The transmission electron microscopy images were used to measure the size of the nanoparticles. The atomic force microscopy images reveal the different aggregation morphology of Yb- and Ru-doped nanoparticles.

Electrochemiluminescence and Charge Transport Properties of Metallopolymer-Gold Nanocomposites

Metallopolymer-gold nanocomposites were prepared by mixing 4-(dimethylamino) pyridine protected gold nanoparticles (diameter approximately 5{plus minus}0.5 nm) and [Ru(bpy)2PVP10](ClO4)2, at different mole ratios where bpy is 2,2'-bipyridyl and PVP is poly(4-vinylpyridine). The photoluminescence emission intensity of the metallopolymer is quenched approximately 72% at AuNP:Ru molar ratio of 12.5x10-2. The electrochemical and the electrochemiluminescence (ECL) properties of thin layers of the nanocomposites are reported. Significantly, despite the ability of the metal nanoparticles to quench the ruthenium based emission in solution, the electrochemiluminescence of the optimized nanocomposite films (mole ratio 6.24x10-2) is approximately 3.5 times greater than that of the parent metallopolymer. This enhancement arises from the increased rate of charge transport through the thin films that leads to a greater number of excited states per unit time while minimizing the quenching effects.

Sonochemical synthesis and characterization of gold–ruthenium bimetallic nanoparticles

Gold–ruthenium (Au–Ru) bimetallic nanoparticles were synthesized by the sonochemical co-reduction of Au(III) and Ru(III) ions in aqueous solutions containing varying mole fractions (1:1, 1:3 and 1:5) of the metal ions using PEG as a stabilizer. The results observed in the current study suggest that the presence of Au nanoparticles significantly reduced the time required from 7 h to 4 h for Ru 3+ reduction due to the Au nanoparticles acting as electron sink mediating the Ru 3+ reduction process. Transmission electron microscopic images revealed that the bimetallic nanoparticles were formed with higher ruthenium content in the shell and higher gold content in the core. The mean diameter of Au–Ru bimetallic nanoparticles increased with an increase in the molar ratio of Ru. A decrease in the double layer current was observed when a Au–Ru bimetallic nanoparticles modified electrode was used in electrochemical experiments compared to a Ru-modified electrode, indicating the potential use of these bimetallic nanoparticles in methanol oxidation fuel cells.

Synthesis of Ordered Macroporous Pt/Ru Nanocomposites for the Electrooxidation of Methanol

Highly catalytic PtRu catalysts with different molar ratios of Pt to Ru have been synthesized by using the inverted colloidal crystals template technique. Three-dimensional ordered Pt/Ru alloys with pore size of 320 nm could be conveniently obtained by electrochemical codeposition of metal precursors inside the voids of the template. The structural and chemical properties of the macroporous catalysts were studied by using SEM, XPS and XRD methods. The decomposition and oxidation of methanol on the macroporous catalyst surfaces with different Pt and Ru molar ratios (Pt100Ru0, Pt90Ru10, Pt80Ru20, Pt70Ru30 and Pt56Ru44) were systemically discussed. Potentiostatic experiments showed that the special structure characteristics (e.g., interconnected pore framework and the flexible curvature) lead to enhanced methanol oxidation efficiency on the macroporous materials as compared to the directly deposited catalyst. These results demonstrate that the three-dimensional ordered porous bimetallic catalysts are promising alternatives for developing high performance DMFC anodic catalysts, especially for the fabrication of microfuel cells.

Effect of Oxygen Partial Pressure on Electrical Conductivity of Ca-Ru-O Compounds Prepared by Spark Plasma Sintering

Ca-Ru-O compounds were prepared by spark plasma sintering (SPS) using CaCO3 and RuO2 powders at various molar ratio of Ru to Ca (RRu/Ca). CaRuO3 in a single phase was obtained at RRu/Ca = 1.0. A non-stoichiometric solid solution range of CaRuO3 was identified at RRu/Ca = 0.7 to 1.0. The electrical conductivity (σ) showed metallic conduction behavior and increased with increasing RRu/Ca. The electrical conductivity at RRu/Ca = 0.8 to 1.0 increased with decreasing oxygen partial pressure (PO2) and the PO2 dependence of σ became significant with increasing temperature.

Synthesis and structural characterization of ruthenium(II) complexes with triphenylstibine, 1,9-dimethylpurine-6-thione, 3,5-dimethylpyridine and 1,4-pyrazine

The reaction of trans-[RuCl 2(SbPh 3) 4] ( 1) with 1,9-dimethylpurine-6-thione, Me 2tp, in CHCl 3, produced trans-[RuCl 2(Me 2tp)(SbPh 3) 2] ( 2). Single crystals containing molecules of 2 could be obtained from chlorobenzene. The X-ray diffraction analysis showed that only one Me 2tp molecule enters the coordination sphere by removing two SbPh 3 molecules even in the presence of excess chelating agent (up to 3:1). Me 2tp chelates through S and N(7) and occupies the two equatorial positions trans to the Sb atoms; the Cl − donors are at the apical sites. The Ru–S and Ru–N bond distances are 2.411(3) and 2.157(10) Å, respectively, whereas the S/N(7) bite distance is 3.06(1) Å. The Me 2tp ligand is sandwiched between the two crystallographically independent C 6H 5Cl molecules with which it has stacking interactions. An attractive intramolecular interaction takes place between the (C(8))H purine proton and the π-system of a Ph group from SbPh 3, the distance between H(8) and the centroid of Ph being 2.79(1) Å. The reaction of 1 with other N-donor ligands (L) such as 3,5-dimethylpyridine (Lut) and 1,4-pyrazine (Pyz) up to a L:Ru molar ratio of 100 caused the removal of only two SbPh 3 molecules out of four and it was not able to remove the Cl − ligands. It was carried out with refluxing CHCl 3, under anaerobic conditions, and brought about the formation of trans,cis,cis-[RuCl 2(Lut) 2(SbPh 3) 2] ( 3) and trans,cis,cis-[RuCl 2(Pyz) 2(SbPh 3) 2] ( 4). The 1H NMR data for 2 are in agreement with a H(8)⋯π(Ph) interaction; a large shielding effect on H(8) taking place. The signals of the H(2) and H(6) protons of Lut and Pyz in 3 and 4 undergo large down-field effects, when compared with data for the free ligands, in agreement with a significant trans influence by Sb.