Amassah Georgina, Mitchell Deborah G, Hovey Tanden A, Eaton Sandra S, Eaton Gareth R
Department of Chemistry and Biochemistry, University of Denver, Denver, CO USA 80210.
Appl Magn Reson. 2023 Sep;54(9):849-867. doi: 10.1007/s00723-023-01569-0. Epub 2023 Jul 23.
Electron spin relaxation times are reported for the SO radical in solid NaSO and KSO, and the SO radicals in NaSO, and KSO. Echo envelope modulation was observed for the radicals in the Na salts and characterized by HYSCORE. and were measured by spin echo methods from 40 to 293 K and by long-pulse saturation recovery at 293 K. At low temperature for the radicals in KSO (~14 μs) is longer than for the radicals in NaSO ( ~ 7 μs) or NaSO ( ~ 4 μs), which is attributed to the low magnetic moment of K. The shorter value of in NaSO is attributed in part to higher spin concentration. decreases with increasing temperature as approaches . In each lattice there is a distribution of spin lattice relaxation times that may be due to distributions in interspin distances. The long components in the distributions are longer for SO than for SO . In 0.5 M NaOH solution at 293 K SO has a relaxation-determined Lorentzian peak-to-peak linewidth of about 0.7 G, and ~ ~ 100 ns.
报道了固体NaSO和KSO中SO自由基以及NaSO和KSO中SO自由基的电子自旋弛豫时间。在钠盐中的自由基观察到回波包络调制，并通过HYSCORE进行了表征。通过自旋回波方法在40至293 K下以及在293 K下通过长脉冲饱和恢复测量了 和 。在低温下，KSO中自由基的 （约14 μs）比NaSO（约7 μs）或NaSO（约4 μs）中的自由基更长，这归因于K的低磁矩。NaSO中 较短的值部分归因于较高的自旋浓度。随着温度升高，当 接近 时， 减小。在每个晶格中，自旋晶格弛豫时间存在分布，这可能是由于自旋间距离的分布所致。 分布中的长分量对于SO 比对于SO 更长。在293 K的0.5 M NaOH溶液中，SO 具有由弛豫确定的峰峰线宽约0.7 G，且 约 约100 ns。
