Hydrocarbon chain conformation of bipolar surfactants in micelles. A magnetic field-dependent carbon-13 and nitrogen-14 NMR spin-lattice relaxation and nuclear Overhauser effect study of N,N'-1,20-eicosanediylbis(triethylammonium bromide)

1989 ◽  
Vol 93 (12) ◽  
pp. 4861-4867 ◽  
Author(s):  
Tuck. C. Wong ◽  
K. Ikeda ◽  
K. Meguro ◽  
O. Soederman ◽  
U. Olsson ◽  
...  
Keyword(s):  
Nuclear Overhauser Effect ◽  
Lattice Relaxation ◽  
Hydrocarbon Chain ◽  
Effect Study ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Overhauser Effect ◽  
Field Dependent ◽  
Nuclear Overhauser ◽  
Triethylammonium Bromide

The nuclear Overhauser effect between phosphorus and hydrogen in selected organo phosphorus compounds

1976 ◽  
Vol 54 (12) ◽  
pp. 1918-1922 ◽  
Author(s):  
H. Beierbeck ◽  
R. Martino ◽  
John K. Saunders ◽  
Claude Benezra
Keyword(s):  
Nuclear Overhauser Effect ◽  
Lattice Relaxation ◽  
Dipole Interaction ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Phosphorus Compounds ◽  
Spin Lattice ◽  
Overhauser Effect ◽  
Internuclear Distances ◽  
Nuclear Overhauser

The nuclear Overhauser effect (nOe) observed between phosphorus and hydrogen together with carbon and phosphorus spin lattice relaxation time (T1) data are presented for a number of phosphorus containing compounds. The dominant mechanism for phosphorus relaxation is shown to be the dipole-dipole interaction between phosphorus and hydrogen. From the nOe and T1 data the determination of phosphorus–hydrogen internuclear distances is demonstrated.

Relaxation pathway analysis by 1H spin-lattice relaxation and nuclear Overhauser effect difference measurements. Application to a reassignment of the 1H nmr spectrum of strychnine and to the determination of the structure and stereochemistry of some strychnine sulfonic acids

1983 ◽  
Vol 61 (8) ◽  
pp. 1749-1755 ◽  
Author(s):  
Walter J. Chazin ◽  
Lawrence D. Colebrok ◽  
John T. Edward
Keyword(s):  
Pathway Analysis ◽  
Nuclear Overhauser Effect ◽  
Lattice Relaxation ◽  
Coupling Constants ◽  
Spin Lattice Relaxation ◽  
Sulfonic Acids ◽  
Spin Lattice ◽  
Overhauser Effect ◽  
Effect Difference ◽  
Nuclear Overhauser

The 1H relaxation pathway analysis of strychnine and some strychnine sulfonic acids has been carried out by spin-lattice relaxation and nuclear Overhauser effect difference measurements. Some previously reported 1H chemical shifts and coupling constants for strychnine are shown to be in error. New assignments for positions 15, 17, 18, and 20 have been made. Proposed sites of substitution of the sulfonic acids have been verified, and the previously undetermined stereochemistry of one of the acids has been established.

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