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119 Sn spin–lattice relaxation times and nuclear Overhauser enhancement factors in some organotin compounds
Author(s) -
Blunden Stephen J.,
Frangou Andrew,
Gillies Duncan G.
Publication year - 1982
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270200312
Subject(s) - nuclear overhauser effect , dipole , relaxation (psychology) , chemistry , spin–lattice relaxation , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , physics , stereochemistry , nuclear quadrupole resonance , organic chemistry , psychology , social psychology
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.