scholarly journals The impact of counterion on the metastable state properties of nitrosyl ruthenium complexes

2020 ◽  
Vol 44 (41) ◽  
pp. 18014-18024
Author(s):  
Artem A. Mikhailov ◽  
Vladislav Yu. Komarov ◽  
Aleksandr S. Sukhikh ◽  
Denis P. Pishchur ◽  
Dominik Schaniel ◽  
...  
Keyword(s):  
Noble Metal ◽  
Metastable State ◽  
Ruthenium Complexes ◽  
Calorimetric Methods ◽  
Linkage Isomers ◽  
The Impact ◽  
Metal Anions

Complexes of the trans-[RuNO(NH3)4F]2+ cation with noble-metal anions [PtCl6]2−, [PdCl4]2−, and [PtCl4]2−, and perchlorate ClO4− were synthesized, the photo-generated linkage isomers were studied by spectroscopic and calorimetric methods.

scholarly journals Noble-Metal-Free Photocatalytic Hydrogen Evolution Activity: The Impact of Ball Milling Anatase Nanopowders with TiH2

2016 ◽  
Vol 29 (5) ◽  
pp. 1604747 ◽  
Author(s):  
Xuemei Zhou ◽  
Ning Liu ◽  
Jochen Schmidt ◽  
Axel Kahnt ◽  
Andres Osvet ◽  
...  
Keyword(s):  
Ball Milling ◽  
Hydrogen Evolution ◽  
Noble Metal ◽  
Photocatalytic Hydrogen Evolution ◽  
Metal Free ◽  
The Impact

scholarly journals Multiple light-induced NO linkage isomers in the dinitrosyl complex [RuCl(NO)2(PPh3)2]BF4unravelled by photocrystallographic and IR analysis

IUCrJ ◽  
2015 ◽  
Vol 2 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Nicolas Casaretto ◽  
Sebastien Pillet ◽  
El Eulmi Bendeif ◽  
Dominik Schaniel ◽  
Anna K. E. Gallien ◽  
...  
Keyword(s):  
Metastable State ◽  
Variable Temperature ◽  
Binding Mode ◽  
Electronic Configuration ◽  
Kinetic Measurements ◽  
X Ray ◽  
Linkage Isomers ◽  
Metastable Structure ◽  
Ir Analysis ◽  
And Shifts

Multiple light-induced reversible metastable NO linkage isomers (PLIs) have been detected in the dinitrosyl compound [RuCl(NO)2(PPh3)2]BF4by a combination of photocrystallographic and IR analysis. The IR signature of three PLI states has been clearly identified, with estimated populations of 59% (PLI-1), 8% (PLI-2) and 5% (PLI-3) for a total population of the metastable state of 72%. The structural configuration of the major component (PLI-1) has been derived by X-ray photocrystallography. In the ground state, the structure is characterized by a bent and a linear nitrosyl, the bent one being oriented towards the linear equatorial nitrosyl with an Ru—N—O angle of 133.88 (9)°. X-ray Fourier difference maps indicate a selectivity of the photo-isomerization process in PLI-1: only the bent NO ligand changes its position, while the linear NO is unaffected. After irradiation at 405 nm, the orientation is changed by rotation towards the Cl ligand opposite the linear NO, with an Ru—N—O angle in this new position of 109 (1)°. The photocrystallographic analysis provides evidence that, in the photo-induced metastable state, the bent NO group is attached to the Ru atom through the N atom (Ru—N—O), rather than in an isonitrosyl Ru—O—N binding mode. In the IR spectra, the asymmetric NO vibrational band shifts by −33 cm−1to a lower value, whereas the symmetric band splits and shifts by 5 cm−1to a higher value and by −8 cm−1to a lower value. The down shift is a clear indication of the structural change, and the small upward shift in response to the new electronic configuration of the metastable structure. Variable-temperature IR kinetic measurements in the range 80–114 K show that the decay of the PLI-1 state follows an Arrhenius behaviour with an activation energy of 0.22 eV.

Estimating the Throwing Power of SS316 when Coupled with AA7075 Through Finite Element Modeling

CORROSION ◽  
10.5006/3438 ◽  
2020 ◽  
Vol 76 (5) ◽  
pp. 476-484
Author(s):  
R.S. Marshall ◽  
A. Goff ◽  
C. Sprinkle ◽  
A. Britos ◽  
R.G. Kelly
Keyword(s):  
Surface Area ◽  
Noble Metal ◽  
Galvanic Corrosion ◽  
Sol Gel ◽  
Total Surface Area ◽  
Electrochemical Kinetics ◽  
Throwing Power ◽  
Galvanic Current ◽  
Fastener Hole ◽  
The Impact

Galvanic corrosion is common in applications involving a fastener and panel assembly. Often, the fastener is made from a more noble metal and the panel is made from a less noble metal, selected for their respective mechanical properties. The ability for the more noble material to galvanically couple to the panel’s surface as a function of distance is referenced to as “throwing power,” and was the main subject of this research. In this work, SS316 and AA7075 were investigated as the fastener and panel material, respectively. A Ti-6Al-4V fastener and a sol-gel coated SS316 fastener were also considered to determine the impact of different materials on the galvanically driven throwing power. Along with different fastener materials, different fastener geometries were considered as well. Raised fasteners are generally used in tandem with washers, while countersunk fasteners are not in order to remain flush with the surface. The difference between these two geometries on the throwing power was investigated. It was determined that the SS316 washer was the largest contributor to the galvanic current in the raised fastener assembly, due to its large surface area. At distances of two inches away, the SS316 fastener and washer were able to double the natural corrosion rate of AA7075. A countersunk SS316 fastener, with the same total surface area as that of the raised fastener and washer assembly, was seen to lower the throwing power which forced a large amount of current down the fastener hole. Throughout all of the computational tests, the model relies on the generation of accurate electrochemical kinetics measured in solutions of appropriate composition.

scholarly journals Effect of Different Radiation Sources and Noble Metal Doped onto TiO2 for Contaminants of Emerging Concern Removal

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 894 ◽  
Author(s):  
Rui C. Martins ◽  
Eva Domingues ◽  
Morgana Bosio ◽  
Margarida J. Quina ◽  
Marta Gmurek ◽  
...  
Keyword(s):  
Noble Metal ◽  
Photocatalytic Oxidation ◽  
Kinetic Constant ◽  
Contaminants Of Emerging Concern ◽  
Order Kinetic ◽  
Visible Radiation ◽  
High Production ◽  
Metal Doped ◽  
The Impact ◽  
Sunlight Radiation

Water scarcity is a worldwide problem boosted by global warming and pollution of anthropogenic origin. The contaminants of emerging concern in water sources are increasing due to the inefficiency of conventional wastewater treatments, and these should be mitigated. Advanced oxidation processes appear as suitable solutions for decontamination. The photocatalytic oxidation of the mixture of sulfamethoxazole, carbamazepine and lorazepam was investigated. TiO2 modified by Ag and TiO2 modified by Pd were used as photocatalysts to improve photoactivity. The impact of light wavelengths was examined using UVA and visible radiation as well as natural sunlight. Visible light revealed the lowest ability for decontamination in 60 min of irradiation through Ag and Pd–TiO2 photocatalytic oxidation. On the other hand, UVA and sunlight in the presence of photocatalysts were able to totally remove the contaminants. This can be related to the high production of reactive oxidative species at those conditions. The increase of the noble metal load promotes the improvement of the decontamination efficiency. The kinetic rate was analyzed for UVA and sunlight radiation for different photocatalytic conditions. The presence of a natural light source without energy costs leads to an increase in the pseudo-first-order kinetic constant. Sunlight radiation with a suitable photocatalyst can be a very good option for water decontamination.

Sterically demanding methoxy and methyl groups in ruthenium complexes lead to enhanced quantum yields for blue light triggered photodissociation

2018 ◽  
Vol 47 (44) ◽  
pp. 15685-15693 ◽  
Author(s):  
Fengrui Qu ◽  
Kristina Martinez ◽  
Ashley M. Arcidiacono ◽  
Seungjo Park ◽  
Matthias Zeller ◽  
...  
Keyword(s):  
Blue Light ◽  
Ruthenium Complexes ◽  
Donor Ligands ◽  
Quantum Yields ◽  
Methyl Groups ◽  
Sterically Demanding ◽  
The Impact

Ruthenium complexes exhibit enhanced photodissociation quantum yields due to bulky, weak donor ligands, illustrating the impact of electronics and sterics.

Recent advances in membrane reactors for hydrogen production by steam reforming of ethanol as a renewable resource

2019 ◽  
Vol 35 (3) ◽  
pp. 377-392 ◽  
Author(s):  
Majid Taghizadeh ◽  
Fatemeh Aghili
Keyword(s):  
Noble Metal ◽  
Steam Reforming ◽  
Membrane Reactor ◽  
Renewable Resource ◽  
Packed Bed ◽  
Membrane Reactors ◽  
Hydrogen Yield ◽  
Recent Advances ◽  
Steam Reforming Of Ethanol ◽  
The Impact

AbstractDuring the last decade, hydrogen has attracted lots of interest due to its potential as an energy carrier. Ethanol is one of the renewable resources that can be considered as a sustainable candidate for hydrogen generation. In this regard, producing hydrogen from ethanol steam reforming (ESR) would be an environmentally friendly process. Commonly, ESR is performed in packed bed reactors; however, this process needs several stages for hydrogen separation with desired purity. Recently, the concept of a membrane reactor, an attractive device integrating catalytic reactions and separation processes in a single unit, has allowed obtaining a smaller reactor volume, higher conversion degrees, and higher hydrogen yield in comparison to conventional reactors. This paper deals with recent advances in ESR in terms of catalyst utilization and the fundamental of membranes. The main part of this paper discusses the performance of different membrane reactor configurations, mainly packed bed membrane reactors, fluidized bed membrane reactors, and micro-membrane reactors. In addition, a short overview is given about the impact of ESR via different catalysts such as noble metal, non-noble metal, and bi-metallic catalysts.

scholarly journals Photocrystallographic Studies on Transition Metal Nitrito Metastable Linkage Isomers: Manipulating the Metastable State

2019 ◽  
Vol 52 (4) ◽  
pp. 1079-1088 ◽  
Author(s):  
Lauren E. Hatcher ◽  
Jonathan M. Skelton ◽  
Mark R Warren ◽  
Paul R. Raithby
Keyword(s):  
Transition Metal ◽  
Metastable State ◽  
Linkage Isomers

scholarly journals Nitrosyl linkage photoisomerization in heteroleptic fluoride ruthenium complexes derived from labile nitrate precursors

2021 ◽  
Author(s):  
Artem A. Mikhailov ◽  
Vladislav Yu. Komarov ◽  
Denis P. Pishchur ◽  
Dominik Schaniel ◽  
Gennadiy A. Kostin
Keyword(s):  
Ruthenium Complexes ◽  
Light Irradiation ◽  
Linkage Isomers ◽  
Reversible Formation

Four complexes with trans-ON–Ru–F coordinate were synthesized from their nitrate precursors. Upon light irradiation, complexes I–III show reversible formation of highly stable linkage isomers MS2 which leads to a higher photogeneration temperature of MS1.

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