Direct Determination of NMR Correlation Times from Spin−Lattice and Spin−Spin Relaxation Times

1997 ◽  
Vol 101 (18) ◽  
pp. 3246-3250 ◽  
Author(s):  
W. Robert Carper ◽  
Charles E. Keller
Keyword(s):  
Spin Relaxation ◽  
Relaxation Times ◽  
Direct Determination ◽  
Correlation Times ◽  
Spin Lattice

A Selective Determination of the Proton Nuclear Relaxation Times of the Alkaloid Vindoline

1972 ◽  
Vol 50 (4) ◽  
pp. 497-503 ◽  
Author(s):  
R. Burton ◽  
C. W. M. Grant ◽  
L. D. Hall
Keyword(s):  
Relaxation Time ◽  
Spin Relaxation ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Nuclear Relaxation ◽  
Methyl Group ◽  
Selective Determination ◽  
Spin Lattice

An audiofrequency-pulse n.m.r. spectrometer has been used to measure the nuclear relaxation times of individual protons of the alkaloid, vindoline. For this substance in deuterochloroform solution the spin–lattice relaxation times (T1) vary between 1.15 and 1.50 s and the spin–spin relaxation times (T2) are between 0.90 and 1.40 s. The N-methyl group has the shortest relaxation time of those resonances which were measured. A discussion of the apparatus and methodology is given.

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