ISSN:
0749-1581
Keywords:
13C NMR Relaxation
;
rates NOE
;
factors Activation
;
energies Chemical shifts
;
Gluconate Manganese-gluconate
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The effect of temperature on the spin-lattice (R1) and spin-spin (R2) 13C relaxation rates of gluconate and manganese (II)-gluconate interactions was determined in D2O. An R2 vs T-1 minimum was observed for gluconate similar to that observed in solid-liquid phase transitions. Nuclear Overhauser enhancement factors indicated predominately dipolar relaxation mechanisms for all atoms except the carbonyl carbon. Activation energies and chemical shifts indicated a molecular reorientation involving the carbonyl carbon which resulted in changes in solvation effects. Addition of manganese(II) to gluconate in D2O resulted in an observed minimum in the R1 vs T-1 plots for all carbon atoms except the carbonyl species. The activation energies further supported the concept of changes in solvent-manganese-gluconate interactions produced by variations in intramolecular structure.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260260711
Permalink
