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Showing 1 to 7 of 7 for “"Deuterium Isotope Effect"”.
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Fundamentals and Applications of the Hydrogen /Deuterium Isotope Effect in Improved Hot -Carrier Reliability of MOS Devices
*Originally published in DAI Vol. 62, No. 6. Reprinted here with corrected author name.
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Physical and Electrical Properties of Hot -Carrier Degradation of Silicon *Mos Transistors Processed in Deuterium and Hydrogen
… been carried out to study the benefits of the deuterium annealing of MOS transistors to achieve hot-carrier lifetime improvement. Deuterium processing as a function of the process parameters such as temperature, time, and pressure for MOS transistors with one level and multilevels of …
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Investigations of the Non-Covalent CH-Π Interactions Using Molecular Torsional Balances
… sterics, conformational entropy, cooperativity, deuterium isotope effect, substitution effects, and solvent effects. It showed that due to the weak nature of CH-pi interactions, many forces can contribute on determining their interacting energies with similar magnitudes. Approaches using …
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Stereoelectronic effects in brominations of cyclopropylarenes and 9-alkylanthracenes
… This is believed to be due to stereoelectronic effects. Molecular mechanics calculations and X-ray crystallography have been used to demonstrate that 9-cycIopropylanthracene, unlike other cyclopropylarenes, is effectively locked in a conformation which places the a-cyclopropyl C-H bond in …
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Primary photoprocesses of light-activated antiviral and antitumor agents, hypericin and hypocrellin
… This long-lived 50--230 ps component exhibits a deuterium isotope effect and a strong solvent bulk viscosity dependence. Such behavior is rationalized by postulating that the excited-state tautomerization pathway, besides the proton stretch, involves at least one other reaction coordinate such as …
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Spectroscopic investigations on the molecular motions and solution chemistry of the medicinal pigment curcumin.
… of time, signifying a successful hydrogen-deuterium exchange. The rate constants of tautomerisation of curcumin have been measured at several temperatures and analysis using the Arrhenius equation has revealed that the activation energy of tautomerisation of curcumin is between 60 and 80 kJ …
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A Radical Approach to Syntheses and Mechanisms
… laser flash photolysis. Rather than a primary isotope effect (associated with C-H bond cleavage), we believe the observed KIEs are secondary, and can be rationalized on the basis of a quantum effect due to hyperconjugative stabilization in aromatic radical cations during an electron transfer …