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A study of the nuclear magnetic resonance quadrapolar relaxation of Cobalt -59 in Cobalt(III) acetylacetonates
| Content Provider | Semantic Scholar |
|---|---|
| Author | Busse, Scott C. |
| Copyright Year | 1986 |
| Abstract | The nuclear magnetic resonance quadrupole relaxation of 59Co in Cobalt(III) acetylacetonate was studied in the hope of determining the molecular motions responsible for the relaxation. A dual spin probe technique was used in which the 13C spin-lattice relaxation rate of the methine carbon was used to determine the rotation motion of the complex which is reported as an activation energy. The 59Co relaxation rate activation energy was compared to the 13C relaxation rate activation energy and the viscosity dependence of the 59Co and 13C relaxation rates were also compared. It was found that in the solvents d6-acetone and diglyme that the 59Co relaxation rate activation energy was the same as the relaxation rate activation energy which suggests that rotational reorientation is the predominate mechanism for the relaxation of the 59Co. In the solvents d6-benzene and d1-chloroform the 59Co and 13C relaxation rate activation energies and viscosity dependence were different which suggests that the 59Co relaxation is not due to rotational reorientation but may be due to vibrational motions. The role of the electric field gradient on the 59Co relaxation rate was examined by making a series of complexes in which one or two of the methine carbons were halogenated. This increased the electric field gradient of the complexes by a small amount. The 59Co relaxation rate activation energies and viscosity dependence of the halogenated complexes were then examined. It was determined that the magnitude of the electric field gradient had no influence on the molecular motions responsible for the 59Co relaxation. A STUDY OF THE NUCLEAR MAGNETIC RESONANCE QUADRAPOLAR RELAXATION OF COBALT -59 IN COBALT(III) ACETYLACETONATES by Scott Charles Busse A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemistry MONTANA STATE UNIVERSITY Bozeman, Montana January, 1986 |
| Starting Page | 1 |
| Ending Page | 114 |
| Page Count | 114 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://scholarworks.montana.edu/xmlui/bitstream/handle/1/4060/31762100050572.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
