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Measurement of the paramagnetic intramolecular contribution to the spin–lattice relaxation time in a nitroxide-labelled glucoside

✍ Scribed by Francis Cinget; Didier Gagnaire; Stephan Houdier; Philippe J. A. Vottéro

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
369 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Doubly labelled 2,2,6,6‐tetramethylpiperidinyl‐1‐oxyl‐4‐yl 2′,3′,4′,6′‐tetra‐O‐acetyl‐β‐D‐glucopyranoside, 2,2,6,6‐tetramethylpiperidinyl‐1‐oxyl‐4‐yl β‐D‐glucopyranoside and 1′,2′‐O‐[1‐(2,2,6,6,‐tetramethyl‐4‐oxy‐1‐oxylpiperidinyl)ethylidene]‐3′,4′,6′‐tri‐O‐acetyl‐α‐D‐glucopyranose (^13^C and NO⋅) were used as model compounds to study the paramagnetic intramolecular contribution (1/T~1~^e^)~intra~ to the ^13^C longitudinal relaxation rate caused by the unpaired electron of the nitroxide radical. It is shown that measurement of (1/T~1~)~intra~ is possible on the assumption that the electron–nucleus dipole–dipole interaction dominates the other terms contributing to 1/T~1~ in the case of paramagnetic substances, and by extrapolating the experimental value of 1/T~1~ to infinite dilution.

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