Articles | Volume 1, issue 2
Magn. Reson., 1, 237–246, 2020
https://doi.org/10.5194/mr-1-237-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue: Geoffrey Bodenhausen Festschrift
Magn. Reson., 1, 237–246, 2020
https://doi.org/10.5194/mr-1-237-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article 14 Oct 2020
Research article | 14 Oct 2020
Surprising absence of strong homonuclear coupling at low magnetic field explored by two-field nuclear magnetic resonance spectroscopy
Ivan V. Zhukov et al.
Related authors
Ivan V. Zhukov, Alexey S. Kiryutin, Mikhail S. Panov, Natalya N. Fishman, Olga B. Morozova, Nikita N. Lukzen, Konstantin L. Ivanov, Hans-Martin Vieth, Renad Z. Sagdeev, and Alexandra V. Yurkovskaya
Magn. Reson. Discuss., https://doi.org/10.5194/mr-2021-17, https://doi.org/10.5194/mr-2021-17, 2021
Preprint under review for MR
Short summary
Short summary
We report data on nuclear polarization formed in photoreaction of intramolecular electron transfer from adenine to flavin that was revealed several years ago by R. Kaptein by CIDNP. The question whether one or two types of biradicals are formed stays unresolved so far. This work clarified the problem and confirmed that single common emissive maximum in magnetic field dependence of CIDNP may originate from single level crossing of short-lived biradical and that FAD molecule has a compact shape.
Ivan V. Zhukov, Alexey S. Kiryutin, Mikhail S. Panov, Natalya N. Fishman, Olga B. Morozova, Nikita N. Lukzen, Konstantin L. Ivanov, Hans-Martin Vieth, Renad Z. Sagdeev, and Alexandra V. Yurkovskaya
Magn. Reson. Discuss., https://doi.org/10.5194/mr-2021-17, https://doi.org/10.5194/mr-2021-17, 2021
Preprint under review for MR
Short summary
Short summary
We report data on nuclear polarization formed in photoreaction of intramolecular electron transfer from adenine to flavin that was revealed several years ago by R. Kaptein by CIDNP. The question whether one or two types of biradicals are formed stays unresolved so far. This work clarified the problem and confirmed that single common emissive maximum in magnetic field dependence of CIDNP may originate from single level crossing of short-lived biradical and that FAD molecule has a compact shape.
Bogdan A. Rodin and Konstantin L. Ivanov
Magn. Reson., 1, 347–365, https://doi.org/10.5194/mr-1-347-2020, https://doi.org/10.5194/mr-1-347-2020, 2020
Short summary
Short summary
This work discusses nuclear magnetic resonance (NMR) experiments, which make use of coherent spin evolution at level anti-crossings. In this work, we provide a common description of such phenomena (hopefully, a reasonably simple one), which is illustrated by a number of examples from various subfields of NMR.
Related subject area
Field: Liquid-state NMR | Topic: Theory
Revisiting paramagnetic relaxation enhancements in slowly rotating systems: how long is the long range?
Giovanni Bellomo, Enrico Ravera, Vito Calderone, Mauro Botta, Marco Fragai, Giacomo Parigi, and Claudio Luchinat
Magn. Reson., 2, 25–31, https://doi.org/10.5194/mr-2-25-2021, https://doi.org/10.5194/mr-2-25-2021, 2021
Short summary
Short summary
The efficiency of MRI contrast agents can increase by exploiting magnetization transfer effects occurring in slow-rotating nanoparticles containing a paramagnetic metal ion and a large number of exchangeable surface protons, which can increase the water proton relaxation rate. Occurrence of magnetization transfer should also be considered to determine accurate metal–proton distances from the experimental proton relaxation rates for protons farther than 15 Å from the paramagnetic metal.
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Special issue
Short summary
We studied spin dynamics in nuclear spin systems at low magnetic fields, where strong coupling among nuclear spins of the same kind, here 13C, is expected. Such conditions are known to be favorable for coherent polarization transfer. However, to our surprise, interactions with other nuclei, i.e., protons, lead to a breakdown of the strong coupling conditions. By using a two-field nuclear magnetic resonance approach, we can manipulate low field-spin dynamics and reintroduce strong coupling.
We studied spin dynamics in nuclear spin systems at low magnetic fields, where strong coupling...
