𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Rotational Dynamics by NMR to Probe Solvation of 2-Pyridone in Hydroxylic Solvents

✍ Scribed by Bernard Tiffon; Jean Guillerez; Bernard Ancian

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
886 KB
Volume
23
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The dynamics of the molecular rotation of 2(1__H__)‐pyridone and 1‐methyl‐2(1__H__)‐pyridone in toluene, carbon tetrachloride, methanol and water have been investigated at 305 K by ^13^C and ^2^H NMR. Both chemical shifts and relaxation times show that 2‐pyridonc forms stable hydrogen‐bonded complexes in methanol and in water, reorienting as a complete unit and taking with it two solvent molecules. These solvated species are stable within the liquid‐state temperature range, and reorient according to the hydrodynamic law as indicated by the ^14^N line width measurements. It follows that the lifetimes of these complexes are always greater by at least an order of magnitude than the rotational correlation time scale. Analysis of the ^14^N quadrupole coupling constants and the rotational anisotropy support the structure and stability of these complexes.

📜 SIMILAR VOLUMES

Preferential Solvation of Organic Specie
Preferential Solvation of Organic Species in Binary Solvent Mixtures Probed by Intermolecular 1H NOESY NMR Spectroscopy
✍ Alessandro Bagno; Marco Campulla; Matteo Pirana; Gianfranco Scorrano; Stefano St 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 174 KB 👁 2 views

The preferential solvation of neutral and ionic organic species (phenol, nitroanilines, N-methylbutyramide, 1,4-dioxane, acetate and tetraalkylammonium ions) in binary solvent mixtures (aqueous CH 3 CN, DMSO, EtOH, 1-PrOH, CH 3 CON(CH 3 ) 2 ; CH 2 Cl 2 /Et 2 O; 1,4-dioxane/benzene; cyclohexane/THF)

Effects of solute–solvent interactions a
Effects of solute–solvent interactions and acid catalysis on the rotational barriers in polarized ethylenes. The significance of large entropies of activation as measured by dynamic NMR
✍ Ulf Berg; Ulf Sjöstrand 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 621 KB

## Abstract Complete ^1^H NMR bandshape analysis has been used to study the rotational barrier around the carbon–carbon double bond in two types of polarized ethylenes; on the one hand for planar ketene mercaptals (A), for which the hindered rotation over the 90 degrees twisted transition state is