Abstract
A novel field-cycling unit with fast digital positioning of a high-resolution nuclear magnetic resonance probe in a spatially varying magnetic field is described and used to measure CIDNP spectra of the amino acid-dye (histidine-bipyridyl) photoreaction system in the range between 0 and 7 T. The pattern of nuclear polarization varies with the magnetic field. In particular, strong polarization with an emission/absorption pattern (multiplet effect) is found at low field for two histidine ringprotons with scalar coupling below 3 Hz visible only because of the high resolution made possible by the new field-cycling setup. Also for the CH2 protons in the β-position a multiplet effect is observed having a pattern changing with magnetic field. By analysis of the spin nutation the non-Boltzmann population differences of the nuclear levels have been determined.
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Grosse, S., Gubaydullin, F., Scheelken, H. et al. Field cycling by fast NMR probe transfer: Design and application in field-dependent CIDNP experiments. Appl. Magn. Reson. 17, 211–225 (1999). https://doi.org/10.1007/BF03162162
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DOI: https://doi.org/10.1007/BF03162162
Keywords
- Nuclear Magnetic Resonance Spectrum
- Polarization Pattern
- Stray Field
- Nuclear Magnetic Resonance Line
- Nuclear Magnetic Resonance Probe