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  Magnetic field dependent long-lived spin states in amino acids and dipeptides

Pravdivtsev, A. N., Yurkovskaya, A. V., Zimmermann, H., Vieth, H.-M., & Ivanov, K. L. (2014). Magnetic field dependent long-lived spin states in amino acids and dipeptides. Physical Chemistry Chemical Physics, 16(16), 7584-7594. doi:10.1039/C3CP55197K.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-8FB0-C Version Permalink: http://hdl.handle.net/21.11116/0000-0004-98DA-B
Genre: Journal Article

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Pravdivtsev, Andrey N., Author
Yurkovskaya, Alexandra V., Author
Zimmermann, Herbert1, Author              
Vieth, Hans-Martin, Author
Ivanov, Konstantin L., Author
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1Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Abstract: Magnetic field dependence of long-lived spin states (LLSs) of the β-CH2 protons of aromatic amino acids was studied. LLSs are spin states, which are immune to dipolar relaxation, thus having lifetimes far exceeding the longitudinal relaxation times; the simplest example of an LLS is given by the singlet state of two coupled spins. LLSs were created by means of the photo-chemically induced dynamic nuclear polarization technique. The systems studied were amino acids, histidine and tyrosine, with different isotopomers. For labeled amino acids with the α-CH and aromatic protons substituted by deuterium at low fields the LLS lifetime, TLLS, for the β-CH2 protons was more than 40 times longer than the T1-relaxation time. Upon increasing the number of protons the ratio TLLS/T1 was reduced; however, even in the fully protonated amino acids it was about 10; that is, the long-lived mode was still preserved in the system. In addition, the effect of paramagnetic impurities on spin relaxation was studied; field dependencies of T1 and TLLS were measured. LLSs were also formed in tyrosine-containing dyads; a TLLS/T1 ratio of [similar]7 was found, usable for extending the spin polarization lifetime in such systems.

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Language(s): eng - English
 Dates: 2013-12-092014-02-172014-02-172014-04-28
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/C3CP55197K
Other: 7981
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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 16 (16) Sequence Number: - Start / End Page: 7584 - 7594 Identifier: ISSN: 1463-9076
DOI: 10.1039/C3CP55197K