The fates and kinetics of recombination of singlet radical pairs generated by photolyses of three phenyl phenylacylates have been examined in unstretched and stretched polyethylene films. Comparisons with results from photolyses of analogous 1-naphthyl phenylacylates in the same media lead to the conclusions that (1) phenoxy is less reactive overall than 1-naphthoxy toward a common phenylacyl radical
在未拉伸和拉伸的聚
乙烯薄膜中,研究了由三苯基苯基酰化物的光解产生的单线自由基对的
重组和动力学。与在相同介质中类似的1-
萘基苯基酰化物的光解结果进行比较,得出以下结论:(1)苯氧基总体上不如1-
萘氧基对一个常见的苯酰基自由基具有反应性,但(2)该自由基对所在的受约束的笼子对1-
萘氧基/苯甲酰基对的运动施加更大的控制。在自由基对的形状和范德华体积,天然聚
乙烯薄膜中位点的空隙体积以及芳氧基的电子性质的背景下讨论了这些观察的原因。