𝔖 Bobbio Scriptorium
✦   LIBER   ✦

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

✍ Scribed by C. Piccinni-Leopardi; O. Fabre; J. Reisse

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
580 KB
Volume
8
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

From Δ__G__~Tc~^≠^ values obtained by ^1^H and ^13^C dynamic nuclear magnetic resonance studies of the same dynamic process, it is possible to estimate Δ__H__^≠^ and Δ__S__^≠^. 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 ^1^H and ^13^C n.m.r. with such an accuracy that Δ__S__^≠^ can be effectively determined from the difference between Δ__G__~Tc~^≠^ values.

📜 SIMILAR VOLUMES

N.m.r. studies in the heterocyclic serie
N.m.r. studies in the heterocyclic series: XVI—determination of the structure of 3-azidoindazole by 1H and 13C n.m.r. spectroscopy
✍ Alain Fruchier; Ermitas Alcalde; José Elguero 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 155 KB 👁 1 views

## Abstract The 1‐NH structure for 3‐azidoindazole has been demonstrated by the observation of ^1^H^1^H and ^13^C^1^H couplings involving the hydrogen atom attached to nitrogen. A comparison between 3‐azidoindazole and indazole shows that both compounds have the same tautomeric structure.

Effects of simultaneous 13C1H and 13C11B
Effects of simultaneous 13C1H and 13C11B decoupling on the carbon-13 n.m.r. spectra of some organoboron compounds
✍ M. Mazurek; T. M. Mallard; P. A. J. Gorin 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 254 KB

## Abstract ^13^C FT n.m.r. spectra were obtained from borates of methyl α‐D‐glucopyranoside, triethylboron, sodium tetraphenylboron and 1‐butaneboronic acid employing a simultaneous ^1^H and ^11^B decoupling network. The effectiveness of the system was evident using the three latter organoboron co