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一、引论自由基是一个很活泼的中间体,一般不能直接进行观测。在液态溶液中,许多自由基以扩散控制的速度进行双分子反应,加上自旋共振(esr)的特性,致使不能用光谱法对它们直接进行检测。然而,若设法使高活性的自由基变成稳定状态的自由基,即把短寿命的自由基转变成长寿命的顺磁性中间体(或称顺磁性自由基),就可使其浓度达到用光谱法测定的限度。其方法很简单,就是往反应体系中加入少量对活性自由基有着特别高的亲合力的抗磁性物质
First, the introduction of free radicals is a very lively intermediate, generally can not be directly observed. In liquid solutions, many free radicals undergo bimolecular reactions at diffusion-controlled rates, combined with spin-resonance (esr) properties, so that they can not be directly detected spectroscopically. However, attempts to convert highly reactive radicals to free radicals, that is, to convert short-lived free radicals to long-lived paramagnetic intermediates (or paramagnetic free radicals) Law of the limit. The method is very simple, is to the reaction system by adding a small amount of reactive free radicals have a particularly high affinity magnetic material