• Citer

Determination of ΔH≠ and ΔS≠ by simultaneous 1H and 13C dynamic n.m.r. studies: Importance of the accuracy of temperature measurement

par Piccinni Leopardi, Carla ;Fabre, Olivier;Reisse, Jacques
Référence Organic Magnetic Resonance, 8, 5, page (233-236)
Publication Publié, 1976

Article révisé par les pairs

• Détails
• Contenu

Résumé :

From ΔGTc ≠ values obtained by 1H and 13C dynamic nuclear magnetic resonance studies of the same dynamic process, it is possible to estimate ΔH≠ and ΔS≠. Nevertheless, the accuracy of the temperature measurement is a factor which limits the applicability of this method. A very simple procedure for calibrating the usual temperature sensors is described, which can be applied to all types of n.m.r. probes. By the use of this procedure it is possible to measure coalescence temperatures in 1H and 13C n.m.r. with such an accuracy that ΔS≠ can be effectively determined from the difference between ΔGTc ≠ values. Copyright © 1976 Heyden & Son Ltd.