Bienvenue chez nous !
Logo Ex Libris
 Laissez-vous inspirer ! 

Deuterium and Shift Calculation

  • Couverture cartonnée
  • 276 Nombre de pages
(0) Donner la première évaluation
Évaluations
(0)
(0)
(0)
(0)
(0)
Afficher toutes les évaluations
In 1931 Vrey, Brickwedde, and Murphy discovered the hydrogen isotope deuterium. The isotopic enrichment was found to arise from th... Lire la suite
CHF 179.00
Impression sur demande - Habituellement expédié sous 4 à 6 semaines.
Commande avec livraison dans une succursale

Description

In 1931 Vrey, Brickwedde, and Murphy discovered the hydrogen isotope deuterium. The isotopic enrichment was found to arise from the fact that the electrolysis oflight water is faster than of heavy water [1,2]. This success showed that although different isotopes of an element behave identically from a chemical standpoint the different isotopic masses nevertheless lead to both isotope effects on equilibrium as well as on rate constants of chemical reactions. Soon, ratios of equilibrium constants of isotopic reactions were called "equilibrium isotope effects" (EIE), ratios of isotopic rate constants "kinetic isotope effects" (KIE). Isotope effects have been found to be especially large for those elements which are directly involved in bond breaking and bond formation during the reaction studied [3]. Such effects are, therefore, referred to as "primary". Isotopic substitution in atomic sites which maintain all chemical bonds with their neighbors during the reaction of interest leads then only to smaller "secondary" isotope effects. Because of the unique mass relation between the different hydrogen isotopes hydrogen/deuterium isotope effects are particularly large and have attracted most attention. The largest contributions to these effects arise from changes in the vibrational frequencies of the reactants. The theory of equilibrium isotope effects has been founded by Vrey [4] and Bigeleisen [5,6] and has widely been accepted [3].

Contenu

Contents: M.L. Martin, G.J. Martin, Nantes, France: Deuterium NMR in the Study of Site-Specific Natural Isotope Fractionation (SNIF-NMR).- H.-H. Limbach, Freiburg, FRG: Dynamic NMR Spectroscopy in the Presence of Kinetic Hydrogen/Deuterium Isotope Effects.- W. Kutzelnigg, U. Fleischer, M. Schindler, Bochum, FRG: The IGLO-Method: Ab-initio Calculation and Interpretation of NMR Chemical Shifts and Magnetic Susceptibilities.

Informations sur le produit

Titre: Deuterium and Shift Calculation
Créateur:
Code EAN: 9783642759345
ISBN: 3642759343
Format: Couverture cartonnée
Editeur: Springer Berlin Heidelberg
nombre de pages: 276
Poids: 423g
Taille: H235mm x B155mm x T14mm
Année: 2012
Auflage: Softcover reprint of the original 1st ed. 1991

Autres articles de cette série  "NMR Basic Principles and Progress"