Chemistry of metal hydrides. VI. Cationic platinum(II) carbonyls stabilized with tertiary arsines and stibines

1969 ◽  
Vol 47 (14) ◽  
pp. 2665-2669 ◽  
Author(s):  
W. J. Cherwinski ◽  
H. C. Clark
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Physical Properties ◽  
Spectroscopic Data ◽  
Chemical Reactivity ◽  
Metal Hydrides ◽  
Tertiary Arsines ◽  
Reaction With Water ◽  
Carbonyl Species

The synthesis of [Pt2Cl2(R3M)4][BF4]2, and its cleavage with carbon monoxide to form the cationic carbonyl species [PtCl(CO)(R3M)2]+ is described for R = ethyl or phenyl, and M = As or Sb. A comparison of the physical properties and spectroscopic data of these compounds, and the analogues for M = P is made with related complexes of other transition metals.Only trans-[PtCl(CO)(Et3As)2][BF4] reacts with water to give trans-[PtHCl(Et3As)2] and carbon dioxide. trans-[PtCl(CO)(Ph3As)2][BF4] reacts readily with methanol or ethanol to give an alkoxy carbonyl [PtCl(COOR)(Ph3As)2], where R = CH3 or C2H5. Unlike their phosphine analogues, these species and the stibine-stabilized cationic carbonyls do not produce the corresponding hydrides on reaction with water in the presence of a salt catalyst. These differences in chemical reactivity are related to the basicity of the ligands.

scholarly journals The thermal conductivities of carbon monoxide and nitrous oxide

1928 ◽  
Vol 121 (787) ◽  
pp. 285-293 ◽  
Keyword(s):  
Molecular Structure ◽  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Nitrous Oxide ◽  
Kinetic Theory ◽  
Physical Properties ◽  
Kinetic Theory Of Gases ◽  
Molecular Weights ◽  
Thermal Conductivities

The authors’ experiments on the thermal conductivities of carbon monoxide and nitrous oxide were undertaken partly because very few determinations had been made previously, and partly on account of a consideration of other physical properties of these gases. Smith showed experimentally that the viscosities of nitrogen and carbon monoxide are equal, and a similar result was obtained in the case of carbon dioxide and nitrous oxide. Such results are indicated by the Kinetic Theory of Gases from the aspect of the equality of molecular weights in the two cases. Similar equalities are not anticipated, however, in the case of the thermal conductivities, as the conduction effect depends on a consideration of differences in molecular structure. The following table shows the values of the thermal conductivities and the viscosities of the four gases concerned, and illustrates the extent to which the thermal conductivities differ:—

scholarly journals Syntone Chemistry. Theoretical Study on the Formation of Cysteine, Aspartic Acid, Asparagine and Threonine

2020 ◽  
Vol 71 (7) ◽  
pp. 278-283
Author(s):  
Gheorghe Surpateanu ◽  
Ileana Denisa Nistor ◽  
Ana-Maria Georgescu ◽  
Neculai Catalin Lungu
Keyword(s):  
Amino Acids ◽  
Carbon Monoxide ◽  
Theoretical Model ◽  
Aspartic Acid ◽  
Low Temperatures ◽  
Theoretical Study ◽  
Chemical Reactivity ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
Reaction With Water

In this paper is presented a theoretical study of chemical reactivity on the formation of four proteinogenic amino acids: cysteine, aspartic acid, asparagine and threonine. According to a theoretical model based on three syntons: methylene, nitrene and carbon monoxide at low temperatures, aziridinone would be formed first. This one, with methylene and carbon monoxide forms further the precursors intermediates of these four proteinogenic amino acids. Finally, the precursors in reaction with water, a key component of the primary atmosphere, lead to amino acids specified above. The study is mainly based on quantum mechanical calculations, B88-LYP DFT. Methylaziridonil, aziridonilacetyl and ethylaziridonil radicals should be formed at low temperature, which finally in reaction with water will form cysteine, aspartic acid, asparagine and threonine.

Atom Condensed Fukui Function for Condensed Phases and Biological Systems and Its Application to Enzymatic Fixation of Carbon Dioxide

2019 ◽  
Author(s):  
Javier Oller ◽  
David A. Sáez ◽  
Esteban Vöhringer-Martinez
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Molecular System ◽  
Chemical Reactivity ◽  
Nucleophilic Attack ◽  
Stable Conformation ◽  
Fukui Functions ◽  
Reactivity Descriptors ◽  
Dynamics Simulations ◽  
Fixation Of Carbon Dioxide

<div><div><div><p>Local reactivity descriptors such as atom condensed Fukui functions are promising computational tools to study chemical reactivity at specific sites within a molecule. Their applications have been mainly focused on isolated molecules in their most stable conformation without considering the effects of the surroundings. Here, we propose to combine QM/MM Born-Oppenheimer molecular dynamics simulations to obtain the microstates (configurations) of a molecular system using different representations of the molecular environment and calculate Boltzmann weighted atom condensed local reac- tivity descriptors based on conceptual DFT. Our approach takes the conformational fluctuations of the molecular system and the polarization of its electron density by the environment into account allowing us to analyze the effect of changes in the molecular environment on reactivity. In this contribution, we apply the method mentioned above to the catalytic fixation of carbon dioxide by crotonyl-CoA carboxylase/reductase and study if the enzyme alters the reactivity of its substrate compared to an aqueous solution. Our main result is that the protein en- vironment activates the substrate by the elimination of solute-solvent hydrogen bonds from aqueous solution in the two elementary steps of the reaction mechanism: the nucleophilic attack of a hydride anion from NADPH on the α, β unsaturated thioester and the electrophilic attack of carbon dioxide on the formed enolate species.</p></div></div></div>

UNIFLUX 70

Alloy Digest ◽  
1978 ◽  
Vol 27 (9) ◽  
Keyword(s):  
Carbon Dioxide ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Carbon Steel ◽  
Physical Properties ◽  
Heat Treating ◽  
Shielding Gas ◽  
Electrode Wire ◽  
Welding Electrode

Abstract UNIFLUX 70 is a continuous flux-cored welding electrode (wire) for welding in carbon dioxide shielding gas in the flat groove and horizontal fillet positions. It is used widely in shipbuilding and other fabricating industries to weld carbon steel and provides around 82,000 psi tensile strength and around 50 foot-pounds Charpy V-notch impact at 0 F. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: CS-74. Producer or source: Unicore Inc., United Nuclear Corporation.

Palladium Promoted Copolymerization of Carbon Monoxide with Polar or Nonpolar Olefinic Monomers

2020 ◽  
Vol 24 ◽  
Author(s):  
Yanlin Zong ◽  
Qiankun Li ◽  
Hongliang Mu ◽  
Zhongbao Jian
Keyword(s):  
Carbon Monoxide ◽  
Physical Properties ◽  
Vinyl Monomers ◽  
Pd Catalysts ◽  
Catalytic Systems

Abstract:: The copolymers of carbon monoxide (CO) and olefins, namely polyketones, are a family of widely used materi-als. In the catalytic preparation of these materials, palladium(II) catalysts represent the most successful catalytic systems. The production of both alternating and non-alternating polyketones has been achieved, with great difference in their physical properties. Herein, a variety of palladium(II) catalysts employed for the copolymerization of CO with various olefinic mon-omers such as ethylene, α-olefins, styrene and polar vinyl monomers are fully summarized. The influence of important fac-tors such as solvents and counterions on specific copolymerization, is also discussed. This review aims to enlighten the de-sign of new Pd catalysts with improved properties, as well as the development of new polyketone materials.

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