منابع مشابه
Transition-state enthalpy and entropy effects on reactivity and selectivity in hydrogenolysis of n-alkanes.
Statistical mechanics and transition state (TS) theory describe rates and selectivities of C-C bond cleavage in C2-C10 n-alkanes on metal catalysts and provide a general description for the hydrogenolysis of hydrocarbons. Mechanistic interpretation shows the dominant role of entropy, over enthalpy, in determining the location and rate of C-C bond cleavage. Ir, Rh, and Pt clusters cleave C-C bon...
متن کاملImpacts of Conformational Geometries in Fluorinated Alkanes
Research of blood substitute formulations and their base materials is of high scientific interest. Especially fluorinated microemulsions based on perfluorocarbons, with their interesting chemical properties, offer opportunities for applications in biomedicine and physical chemistry. In this work, carbon K-edge absorption spectra of liquid perfluoroalkanes and their parent hydrocarbons are prese...
متن کاملEffects of Conformational Isomerism on the Desorption Kinetics of N-Alkanes from Graphite
The dynamics of oligomer desorption from surfaces have been studied by measuring the desorption kinetics of a set of n-alkanes from the surface of single crystalline graphite. Desorption rates were measured using a set of 21 monodispersed n-alkanes (CNH2N12,5<N<60) each adsorbed at coverages in the range ,0.1 to .1 monolayers. Desorption is observed to be a first-order process with a desorption...
متن کاملConfinement induced conformational changes in n-alkanes sequestered within a narrow carbon nanotube.
While alkanes in solution exhibit predominantly extended conformations, nanoscale confinement of these chains within protein binding sites and synthetic receptors can significantly alter the conformer distribution. As a simple model for the effect of confinement on the conformation, we report molecular simulations of n-alkanes absorbed from a bulk solvent into narrow carbon nanotubes. We observ...
متن کاملEntropy-enthalpy Compensation Conformational Fluctuation and Induced--t
A localized change in a protein, which occurs as a result of either ligand binding or single amino acid substitution, necessarily encounters the conformational uctuation of the rest of the protein. Both the entropy and the enthalpy associated with the change consist of contributions from uctuations in the atoms surrounding the localized site, but they compensate. A novel thermodynamic ensemble ...
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ژورنال
عنوان ژورنال: Polymer Journal
سال: 1983
ISSN: 0032-3896,1349-0540
DOI: 10.1295/polymj.15.207