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Hyperfine Interactions of Narrow-Line Trityl Radical with Solvent Molecules Full article

Journal Journal of Magnetic Resonance
ISSN: 1090-7807 , E-ISSN: 1096-0856
Output data Year: 2013, Volume: 233, Pages: 29 - 36 Pages count : 8 DOI: 10.1016/j.jmr.2013.04.017
Tags DNP, ENDOR, Trityl radical
Authors Trukhan S.N. 1,2 , Yudanov V.F. 1 , Tormyshev V.M. 2,3 , Rogozhnikova O.Yu. 3 , Trukhin D.V. 3 , Bowman M.K. 4 , Krzyaniak M.D. 4 , Chen H. 4 , Martyanov O.N. 1
Affiliations
1 Boreskov Institute of Catalysis, pr. Ak. Lavrentieva, 5, Novosibirsk 630090, Russia
2 Department of Natural Sciences, Novosibirsk State University, 2 Pirogov St., Novosibirsk 630090, Russia
3 Vorozhtsov Novosibirsk Institute of Organic Chemistry, pr. Ak. Lavrentieva, 9, Novosibirsk 630090, Russia
4 Chemistry Department, The University of Alabama, Box 870336, Tuscaloosa, AL 35487-0336, USA

Funding (4)

1 Russian Foundation for Basic Research 13-04-00680
2 National Science Foundation CHE-0079498
3 National Science Foundation CHE-0342921
4 National Institute of Biomedical Imaging and Bioengineering 5P41EB002034

Abstract: The electron nuclear dipolar interactions responsible for some dynamic nuclear polarization (DNP) mechanisms also are responsible for the presence formally in CW EPR spectra of forbidden satellite lines in which both the electron spin and a nuclear spin flip. Such lines arising from 1H nuclei are easily resolved in CW EPR measurements of trityl radicals, a popular family of DNP reagents. The satellite lines overlap some of the hyperfine features from 13C in natural abundance in the trityl radical, but their intensity can be easily determined by simple simulations of the EPR spectra using the hyperfine parameters of the trityl radical. Isotopic substitution of 2H for 1H among the hydrogens of the trityl radical and/or the solvent allows the dipolar interactions from the 1H on the trityl radical and from the solvent to be determined. The intensity of the dipolar interactions, integrated over all the 1H in the system, is characterized by the traditional parameter called reff. For the so-called Finland trityl in methanol, the reff values indicate that collectively the 1H in the unlabeled solvent have a stronger integrated dipolar interaction with the unpaired electron spin of the Finland trityl than do the 1H in the radical and consequently will be a more important DNP route. Although reff has the dimensions of distance, it does not correspond to any simple physical dimension in the trityl radical because the details of the unpaired electron spin distribution and the hydrogen distribution are important in the case of trityls.
Cite: Trukhan S.N. , Yudanov V.F. , Tormyshev V.M. , Rogozhnikova O.Y. , Trukhin D.V. , Bowman M.K. , Krzyaniak M.D. , Chen H. , Martyanov O.N.
Hyperfine Interactions of Narrow-Line Trityl Radical with Solvent Molecules
Journal of Magnetic Resonance. 2013. V.233. P.29 - 36. DOI: 10.1016/j.jmr.2013.04.017 WOS Scopus РИНЦ ANCAN PMID OpenAlex
Files: Full text from publisher
Dates:
Submitted: Mar 28, 2013
Published online: May 9, 2013
Published print: Aug 1, 2013
Identifiers:
Web of science: WOS:000322209600004
Scopus: 2-s2.0-84878258259
Elibrary: 21467850
Chemical Abstracts: 2013:1105758
Chemical Abstracts (print): 160:333312
PMID: 23722184
OpenAlex: W2015909174
Citing:
DB Citing
Web of science 41
Scopus 43
Elibrary 39
OpenAlex 47
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