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An investigation of 1H and 13C longitudinal relaxation and relaxation in the rotating frame in solid poly(N-vinylcarbazole)

✍ Scribed by Frank Heatley; Aglaia Karali; Photis Dais

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
118 KB
Volume
50
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

^1^H and ^13^C longitudinal relaxation times (T~1~) and relaxation times in the rotating frame (T~1ρ~) have been measured for poly(N‐vinylcarbazole) in the solid state in air and nitrogen atmospheres in an attempt to elucidate molecular motions. In air, the T~1~ relaxation of both ^1^H and ^13^C was dominated by interaction with absorbed paramagnetic oxygen. In nitrogen, the ^13^C T~1~ relaxation times were long (>300 s) and were averaged by ^13^C–^13^C spin diffusion. The ^13^C T~1ρ~ relaxation times showed an exponential dependence on the strength of the rotating ^13^C magnetic field and were thus controlled by spin–spin processes rather than spin–lattice processes.

© 2001 Society of Chemical Industry

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