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Showing 1 to 20 of 82 for “"electronic effects"”.
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Electronic effects in radiation damage simulations in metals
… a signi�ficant proportion of their energy to electronic excitations, therefore a simulation of the relaxation of a metallic lattice after a high energy event requires a description of the energetic interaction between atoms and electrons. The mechanisms of inelastic collisions between …
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Quantum Electronic Effects in Ultrathin Metal Films on Semiconductors
… physical properties due to quantum size effects. In this work, two of these effects are investigated in detail: the structural distortions that arise due to quantum confinement of a metal's itinerant electrons to an ultrathin film and variations in the surface energy (relative stability) …
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Steric and Electronic Effects Induced by Ancillary Ligand Substitutions on Cyclopentadienyl Osmium Complexes
To understand these variances, the molecular geometries of several osmium(II) and osmium(IV) complexes were investigated. (C5H5)Os(dmpm)Br reacts with NaOMe in refluxing methanol to afford the monohydride compound (C5H5)Os(dmpm)H, which can be protonated with HBF 4·Et2O to afford …
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A. Electronic Effects in Nuclear Magnetic Resonance. B. Electron Spin Resonance of Free Radicals
Made available in DSpace on 2014-12-05T19:36:38Z (GMT). No. of bitstreams: 1 0023325.pdf: 3793034 bytes, checksum: d33c2e18fb890b7a799c203cbe1811bb (MD5) Previous issue date: 1957
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Ethanol and Fluorinated Ethanol Decomposition on Single Crystal Platinum Surfaces: Structure Sensitivity and Electronic Effects
To study the surface work function effect on the surface reaction mechanism, ethanol and fluorinated ethanol decomposition have also been studied on clean and oxygen precovered (2 x 1)Pt(110) surface. The reaction mechanism is very similar on clean (2 x 1)Pt(110) as on Pt(331), except the ethanol …
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Electronic Effects in Multidentate Pyridinol and N-Heterocyclic Carbene Based Ligands for Transition Metal Catalyzed Carbon Dioxide Reduction
… is that through the control of steric and electronic factors we can design better catalysts using various transition metals. Multidentate ligands composed of pyridyl bound to N-heterocyclic carbene rings are a synthetically flexible scaffold capable of testing our hypotheses. The systematic …
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A study of the electronic effects of various substituents on the course of an aromatic cyclodehydration reaction vs. a Elbs-type reaction
The acld-oata17zed oyclodehydrat1on reaction of 2-benzylphenyl l-naphthyl ketone gives two products! 9-(1-naphthyl)anthracene, the expected product and in addition lO-phenyl-l,2-benzanthracene. This second product is the one expected it the ketone were subjected to the conditions of an .Elba …
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Investigation of the steric and/or electronic effects associated with the (1,5)-sigmatropic rearrangement of 1-substituted-2,3,4,5-tetraphenyl- 2,4-cyclopentadien-1-ols
… It was determined that the steric and electronic nature of the migrating groups played a predictable role in the [l,5]-sigmatropic rearrangement of these compounds. Electron donating groups increased the rate of migration whereas electron withdrawing substituents were responsible for …
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Electronic String Quartet #1
Electronic String Quartet #1 by Ted Smoker incorporates the expressiveness of live string performance with the sonic capabilities of music technology through the use of electronic effects processing. This piece incorporates pitch-set theory, polytonality, Lydian and Phrygian church modes, …
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Study of the oxidative degradation of 2,2,3,4,5-pentaphenyl-3- cyclopentenone by various oxidants ; and, [1,5]-sigmatropic phenyl rearrangements in 2- and/or 5-(p- or m-substituted phenyl)-1,3,4-triphenyl-2,4- cyclopentadien-1-ols: electronic effects at the migration terminus
… was investigated to determine the extent of electronic effects in this neutral sigmatropic rearrangement. The results of these rearrangements are used to discuss the proposed transition state for phenyl rearrangements in the pentaphenylcyclopentadienol system. A strictly neutral transition …
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The beta effect in alkylsilanes
… to discover whether or not the alpha and beta effects interact with each other, and if so whether interaction is via steric or electronic effects. A series of compounds were made with a constant chloromethyl alpha function and varying beta functions (hydroxy, methoxy and chloro groups); plus a …
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ΜΕΛΕΤΗ ΤΗΣ ΗΛΕΚΤΡΟΝΙΚΗΣ ΔΟΜΗΣ, ΤΗΣ ΓΕΩΜΕΤΡΙΑΣ ΚΑΙ ΤΗΣ ΔΡΑΣΤΙΚΟΤΗΤΑΣ ΥΠΕΡΣΘΕΝΩΝ ΟΡΓΑΝΟΑΛΟΓΟΝΟΥΧΩΝ ΕΝΩΣΕΩΝ
… STUDY, THE MOLECULAR GEOMETRY AND THE PARTICULAR ELECTRONIC EFFECTS OF HYPERVALENT ORGANOHALOGEN COMPOUNDS OF THE FORMULA PHXX'2 WAS EXAMINED AND THEIR ABILITY TO FORM ADDITION PRODUCTS WITH ETHYLENE DOUBLE BONDS VIA A SYNCHRONOUS MOLECULAR ADDITION MECHANISM. THE NATURE OF THE X-X' BONDS WAS ALSO …
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The chemistry of some triphenylmethane dyes
… from the relevant carbinols. The steric and electronic effects of the substituents on the visible absorption spectra of the dyes have been examined and linear correlations between A max and appropriate Hammett substituent constants have been established. The rates of hydrolysis of the …
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Computational study on the origins of asymmetric induction in Pd-catalyzed cross-coupling reactions and suggestions for improvements thereupon
… and ligands are explored in terms of steric and electronic effects relevant to oxidative addition. As one of the most successful ligands to date for the asymmetric Suzuki reaction, KenPhos is given substantial attention and subjected to detailed structural analysis. The analysis leads to …
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The Chemistry of some Di- and Tri-Phenylmethane dyes
… reaction mechanism and the nature of substituent effects. The rate data obtained for each dye studied have been used to obtain thermodynamic activation parameters and to test the applicability of an isokinetic relationship in the dye systems. The various methods of computation and their results …
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X -Ray Studies of Metal Thin Film Growth on Semiconductors
… in connection with recent models and theories of electronic effects on the growth of ultrathin metal films.
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A Comparative Study of Inductive Influence on the Hydrolysis of Beta-Thioglucopyranosides by Beta-Thioglucosidase and Beta-Glucosidase
… the Hammett equation in testing the quantitative electronic effects of the substitutents on the rate of bond hydrolysis.
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Geometric and Electronic Structure Sensitivity of Methyl and Methylene Reactions on α-Cr₂O₃ and α-Fe₂O₃ surfaces
Structural and electronic effects in hydrocarbon reactions over metal oxides have been examined by comparing the reactions of methyl (-CH₃) and methylene (=CH₂) fragments on three different oxide single crystal surfaces: α-Cr₂O₃(101̅2), α-Cr₂O₃(0001), and α-Fe₂O₃(101̅2). The intermediates have been …
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A 59-Cobalt NMR Investigation of the Hydrogen/Deuterium Exchange Kinetics in Cobalt(III) Complexes
… the rate constant is 1.82 x 10"4 sec"'. Electronic effects of ligands have also been investigated. Experimental conditions (e.g., observation frequencies and solution parameters) and the representative NMR spectra are presented.
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