Cautionary note: linewidth effect in dynamic NMR.
In using NMR spectroscopy to evaluate the effects of kinetic processes taking place in the solute molecules being studied, one must estimate the inherent width w of each line, which is hidden from view throughout the kinetic thermal region due to the line-width broadening effected by the processes. We have herein built a self-consistent model function w(T) to attempt to evaluate the variation in the Arrhenius activation energy obtained with the model parameters present in w(T). As it turns out, a sizable number of such line-width parameters yields excellent spectral fits, and these lead to a considerable range of possible activation energies.
Weil
J A
JA
Dept. of Chemistry, University of Saskatchewan, Saskatoon, Canada. ohn.weil@usask.ca
Wong
B C S
BC
Yu
J
J
D000465:Algorithms; D001713:Biphenyl Compounds / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000706:statistics & numerical data; D008956:Models, Chemical; D010851:Picrates / Q000737:chemistry; D013696:Temperature; D013816:Thermodynamics
D001713:Biphenyl Compounds; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl