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Probing a chemical compass : novel variants of low frequency reaction yield detected magnetic resonance
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Maeda, Kiminori, Storey, Jonathan G., Liddell, Paul A., Gust, Devens, Hore, P. J., Wedge, Christopher and Timmel, C. R. (Christiane R.) (2015) Probing a chemical compass : novel variants of low frequency reaction yield detected magnetic resonance. Physical Chemistry Chemical Physics, Volume 17 . pp. 3550-3559. doi:10.1039/c4cp04095c ISSN 1463-9076.
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Official URL: http://dx.doi.org/10.1039/C4CP04095C
Abstract
We present a study of a carotenoid-porphyrin-fullerene triad previously shown to function as a chemical compass: the photogenerated carotenoid-fullerene radical pair recombines at a rate sensitive to the orientation of an applied magnetic field. To characterize the system we develop a time-resolved Low-Frequency Reaction Yield Detected Magnetic Resonance (tr-LF-RYDMR) technique; the effect of varying the relative orientation of applied static and 36 MHz oscillating magnetic fields is shown to be strongly dependent on the strength of the oscillating magnetic field. RYDMR is a diagnostic test for involvement of the radical pair mechanism in the magnetic field sensitivity of reaction rates or yields, and has previously been applied in animal behavioural experiments to verify the involvement of radical-pair-based intermediates in the magnetic compass sense of migratory birds. The spectroscopic selection rules governing RYDMR are well understood at microwave frequencies for which the so-called ‘high-field approximation’ is valid, but at lower frequencies different models are required. For example, the breakdown of the rotating frame approximation has recently been investigated, but less attention has so far been given to orientation effects. Here we gain physical insights into the interplay of the different magnetic interactions affecting low-frequency RYDMR experiments performed in the challenging regime in which static and oscillating applied magnetic fields as well as internal electron-nuclear hyperfine interactions are of comparable magnitude. Our observations aid the interpretation of existing RYDMR-based animal behavioural studies and will inform future applications of the technique to verify and characterize further the biological receptors involved in avian magnetoreception.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Library of Congress Subject Headings (LCSH): | Animal magnetism, Bioelectromagnetism, Magnetic fields -- Physiological effect, Migratory birds | ||||||||||
Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||||||||
Publisher: | The Royal Society of Chemistry | ||||||||||
ISSN: | 1463-9076 | ||||||||||
Official Date: | 2015 | ||||||||||
Dates: |
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Volume: | Volume 17 | ||||||||||
Number of Pages: | 10 | ||||||||||
Page Range: | pp. 3550-3559 | ||||||||||
DOI: | 10.1039/c4cp04095c | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 28 December 2015 | ||||||||||
Date of first compliant Open Access: | 28 December 2015 | ||||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), United States. Defense Advanced Research Projects Agency (DARPA), EMF Biological Research Trust | ||||||||||
Grant number: | QuBE: N66001-10-1-4061 (DAPRA) |
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