Abstract
Rapid-scan electron paramagnetic resonance (EPR) was used to measure the room temperature spin-spin relaxation timeT 2 for the per-deuterated nitroxyl radical, 4-oxo-2,2,6,6-tetramethylpiperidin-1-oxyl-d16 in water at 250 MHz. Signals were recorded on a locally constructed system using either sinusoidal or triangular magnetic field scans. Values ofT 2 were obtained by simulation of the rapid-scan response and were systematically shorter for the high-field line (m 1=−1) than for them 1=0 or +1 lines. Form 1=+1, the value ofT 2 increased from 0.41±0.03 μs at 0.5 mM to 0.53±0.03 μs at 0.1 or 0.2 mM. Form 1=−1,T 2 increased from 0.35±0.03 μs at 0.5 mM to 0.42±0.03 μs at 0.1 or 0.2 mM. These values put lower bounds on the values ofT 1 for this nitroxyl at 250 MHz.
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Tseitlin, M., Dhami, A., Quine, R.W. et al. Electron spinT 2 of a nitroxyl radical at 250 MHz measured by rapid-scan EPR. Appl. Magn. Reson. 30, 651–656 (2006). https://doi.org/10.1007/BF03166224
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DOI: https://doi.org/10.1007/BF03166224