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  • Proton relaxation  (1)
  • rates NOE  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Carbon-13 NMR relaxation studies of gluconate and manganese - gluconate interactions (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 591-594 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 13C NMR Relaxation ; rates NOE ; factors Activation ; energies Chemical shifts ; Gluconate Manganese-gluconate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260260711
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  • 2
    Digitale Medien
    Digitale Medien
    NMR 1H relaxation and NOESY studies of spiperone conformational features in solution (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 566-572 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 1H NMR ; 13C NMR ; 19F NMR ; NOESY ; 2D NMR ; NMR assignments ; Spiperone conformation in solution ; Proton relaxation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The high-field 1H, 19F and 13C NMR spectra of spiperone in CDCl3 solution were analyzed with the aid of homonuclear (H-H-COSY) and heteronuclear (H,C-COSY) chemical shift correlation experiments. Multiple through-space intersections were identified using phase-sensitive nuclear Overhauser and exchange spectroscopy (NOESY). Proton relaxation rates and activation energies were determined over the temperature range -60 to 50°C. The chemical shift, NOESY and proton relaxation rate results support the formation of cyclic dimers and multiple spiperone conformations in solution.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260310609
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