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Science 28 January 1994:
Vol. 263. no. 5146, pp. 490 - 493
DOI: 10.1126/science.8290958
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Articles

Science, Vol 263, Issue 5146, 490-493
Copyright © 1994 by American Association for the Advancement of Science

articles

Molecular dynamics in liquids: spin-lattice relaxation of nitroxide spin labels

BH Robinson, DA Haas, and C Mailer

Department of Chemistry, University of Washington, Seattle 98195.

Time domain pulsed saturation recovery and electron-electron double resonance spectroscopies were used to measure the spin-lattice relaxation rates of the electron and the nitrogen nucleus in nitroxide spin labels in liquids. The rotational correlation time range covered is from picoseconds to milliseconds. These rates are quantitatively explained by isotropic rotational Brownian dynamics, which modulate the interactions between the electron spin and the molecular angular momentum; the nitrogen and electron spins; and the solvent protons with both the electron and the nitrogen spins. This solves a 20-year-old problem that has limited scientific applications of nitroxides.


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T. I. Smirnova, T. G. Chadwick, R. MacArthur, O. Poluektov, L. Song, M. M. Ryan, G. Schaaf, and V. A. Bankaitis (2006)
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Unusual Mode of Binding of Human Group IIA Secreted Phospholipase A2 to Anionic Interfaces as Studied by Continuous Wave and Time Domain Electron Paramagnetic Resonance Spectroscopy.
S. Canaan, R. Nielsen, F. Ghomashchi, B. H. Robinson, and M. H. Gelb (2002)
J. Biol. Chem. 277, 30984-30990
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