Electron spin resonance of solubilized long-chain nitroxides
Electron spin resonance of solubilized long-chain nitroxides
复制标题
溶解的长链硝基氧的电子自旋共振
DOI：
10.1021/j100858a030
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发表时间：
1968
期刊：
影响因子：
--
通讯作者：
O. Griffith
中科院分区：
文献类型：
--
作者：
A. Waggoner;A. Keith;O. Griffith
用电子自旋共振方法研究了十二烷基硫酸钠胶束增溶两种长链氮氧自由基探针的行为。在0-5%十二烷基硫酸钠水溶液浓度范围内，测量了探针的旋转相关时间。在临界胶束浓度以上，探针与胶束结合，由于与胶束的相互作用，探针的滚动率降低。还报道了溶解度和偶合常数数据。这些数据表明了一种增溶的动力学模型，在该模型中，氮氧化物探针比假设的刚性胶束滚动得更快。氮氧基团经历了一个相对极化的时间平均环境。这些结果与之前使用完全不同的氮氧化物探针进行的研究一致。
The solubilization of two long-chain nitroxide free-radical probes by sodium dodecyl sulfate micelles has been studied by electron spin resonance. The rotational correlation times of the probes were measured over the concentration range 0-5% sodium dodecyl sulfate in water. Above the critical micelle concentration the probes associate with the micelles and the tumbling rates of the probes are reduced as a result of interactions with the micelles. Solubility and coupling constant data are also reported. The data suggest a dynamic model of solubilization in which the nitroxide probes tumble much more rapidly than a hypothetical rigid micelle. The nitroxide groups experience a relatively polar time-averaged environment. These results are consistent with a previous study using quite dissimilar nitroxide probes.