| Main Title |
Effects of Paramagnetic Relaxation Reagents on 15N Spin Relaxation and the Use of Gd(dpm)3 as a Nitrogen-15 Nuclear Magnetic Resonance Spin Label. |
| Author |
Levy, George C. ;
Dechter, James J. ;
Kowalewski, Jozef ;
|
| CORP Author |
Florida State Univ., Tallahassee. Dept. of Chemistry.;Health Effects Research Lab., Research Triangle Park, NC. |
| Year Published |
1977 |
| Report Number |
EPA-R-804916; EPA-600/J-78-193; |
| Stock Number |
PB82-154964 |
| Additional Subjects |
Paramagnetic relaxation ;
Isotopic labeling ;
Spin lattice relaxation ;
Gadolinium ;
Nuclear magnetic resonance ;
Solutions ;
Reprints ;
Paramagnetic relaxation reagents ;
Carbon 13 ;
Nitrogen 15 ;
Overhauser effect
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB82-154964 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
9p |
| Abstract |
Electron-nuclear relaxation times (T(1) sup e's) for (15)N and (13)C in natural abundance are measured for a series of amines of a wide range of pK(a)s using four paramagnetic relaxation reagents that are soluable in organic solutions. Cr(acac)3 and Cr(dpm)3 are seen to affect the nuclear spin predominantly via an outer sphere mechanism, or through normal translational diffusion when no interactions occur. Gd(dpm)3 and Gd(acac)3 are observed to be specific for the basic sites in substrate molecules where relaxation rate enhancement is seen to be strongly dependent on the availability of the lone electron pair. Variable concentration and temperature studies are used to separate the various contributions to T(1) sup e. (15)N T(1) sup e's are used as one measure of spin labeling; changes in the negative nuclear Overhauser effect (NOE) of proton-decoupled (15)N spectra can also be used in some cases. Examples are presented illustrating spin labeling due to both basicity and steric effects. |
| Supplementary Notes |
Pub. in Jnl. of the American Chemical Society 100(8), p2308-2314 1978. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: The Effects of Paramagnetic Relaxation Reagents on 15N Spin Relaxation and the Use of Gd(dpm)3 as a Nitrogen-15 Nuclear Magnetic Resonance Spin Label. |
| PUB Date Free Form |
10 Oct 77 |
| Category Codes |
7D; 99F |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/11 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
323810685 |
| Origin |
NTIS |
| Type |
CAT |
