119Sn spin–lattice relaxation times and nuclear Overhauser enhancement factors in some organotin compounds

✍ Scribed by Stephen J. Blunden; Andrew Frangou; Duncan G. Gillies

• Publisher: John Wiley and Sons
• Year: 1982
• Tongue: English
• Weight: 436 KB
• Volume: 20
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1270200312

✦ Synopsis

Abstract

Dipole‐dipole relaxation via non‐bonded protons is an important relaxation mechanism for^119^Sn in tri‐n‐propyltin and tri‐n ‐butyltin compounds. This causes a negative nuclear Overhauser effect, arising from the negative magnetogyric ratio, which in some cases nulls the signal. The relative contributions from the spin‐rotation and dipole‐dipole mechanisms vary: larger molecules have lower spin‐rotation and higher dipolar relaxation rates. The practical significance of large nuclear Overhauser enhancement factors in recording ^119^Sn spectra and the relation of the dipole‐dipole contribution to the molecular motion and of the spin‐rotation contribution to the absolute shift scale for ^119^Sn are discussed.