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Cited by 17Electron Spin Resonance StudiesMagnetism in coordination complexesAdvanced NMR Techniques and Applications

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Electron Spin–Lattice Relaxation Rates for High-Spin Fe(III) Complexes in Glassy Solvents at Temperatures between 6 and 298 K

Zhou, Yi, Bowler, Bruce E, Eaton, Gareth R, Eaton, Sandra S·2000·Journal of Magnetic Resonance
DOI 10.1006/jmre.2000.2047
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Abstract

The temperature dependence of spin-lattice relaxation rates was analyzed for four high-spin nonheme iron proteins between 5 and 20 K, for three high-spin iron porphyrins between 5 and 118 K, and for four high-spin heme proteins between 5 and 150 to 298 K. For the nonheme proteins the zero-field splittings, D, are less than 0.7 cm(-1), and the relaxation is dominated by the Orbach and Raman processes. For the iron porphyrins and heme proteins D is between 4 and 12 cm(-1) and the relaxation is dominated by the Orbach process between about 5 and 100 K and by a local mode at higher temperatures. The relaxation rates for the heme proteins in glassy matrices extrapolated to values at room temperature that are similar to values obtained by NMR relaxivity in fluid solution. This similarity suggests that for high-spin Fe(III) heme proteins with effective intramolecular spin-lattice relaxation processes, the additional motional freedom gained when a relatively large protein goes from glassy solid to liquid solution at room temperature has little impact on spin-lattice relaxation.

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Metadata

Authors
Zhou, Y., Bowler, B. E., Eaton, G. R., & Eaton, S. S.
Affiliations
University of Denver (US)
ORCID
Venue
Journal of Magnetic Resonance
Publisher
Elsevier BV
Published
2000-05
Volume
144
Issue
1
Pages
115-122
ISSN
1090-7807 (ISSN-L)
DOI
10.1006/jmre.2000.2047
OpenAlex
W2054358265
Cited by
17
References
57
Citations by year
2022: 1 · 2020: 1 · 2019: 1 · 2016: 2 · 2015: 3 · 2012: 1
FWCI
0.98
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Journal of Magnetic Resonance (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of General Medical Sciences (R01GM021156, GM 57635, GM 21156, R15GM057635)
Topics
  • Physical Sciences › Chemistry › Spectroscopy › Electron Spin Resonance Studies
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Magnetism in coordination complexes
  • Physical Sciences › Chemistry › Spectroscopy › Advanced NMR Techniques and Applications
Keywords
electron spin-lattice relaxation, heme proteins, iron porphyrin, low-temperature relaxation, Orbach relaxation, Raman relaxation, zero-field splitting, NMR relaxivity
MeSH terms
Animals, Electron Spin Resonance Spectroscopy, Glass, Hemeproteins, Mathematics, Metalloporphyrins, Proteins, Solvents, Spin Labels, Temperature, Iron Compounds

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