Unstable intermediates. Part 165. Radicals in irradiated organolead compounds: an electron spin resonance study
作者:Robert J. Booth、Stephen A. Fieldhouse、Haydn C. Starkie、Martyn C. R. Symons
DOI:10.1039/dt9760001506
日期:——
the parent radical anions. The electron-loss centres are thought to be the corresponding cations, with the hole largely confined to the halogen atoms. Irradiated PbMe3Cl gives a similar anionic centre in methanolic solution, but the pure material gives largely Me˙ and PbMe2(ĊH2)Cl radicals. Irradiated PbMe4 and PbEt4 pure or in toluene at 77 K. give centres thought to be PbR3˙ radicals having g⊥≈ 2
PbPh的曝光3 Cl和PbBrPh 3至60钴γ射线在77K产生了具有中心207 Pb和35 Cl或81个溴超精细耦合常数与预期父自由基阴离子是一致的。电子损失中心被认为是相应的阳离子,空穴主要局限在卤素原子上。辐照的PbMe 3 Cl在甲醇溶液中给出了相似的阴离子中心,但纯净的材料在很大程度上给出了Me P和PbMe 2(2H 2)Cl自由基。辐照的PbMe 4和PbEt 4纯的或在77K给定中心甲苯认为是PBR 3个具有˙自由基克⊥听,说:2.1和克∥听,说:1.9,异常大的各向异性207的Pb超精细耦合常数。此外,PbMe 4给出了一个中心认为是[PbMe 4 ] - ˙两者生成R和PbMe 3(CH 2)或PBET 3(CHME)。辐照的Pb 2 Ph 6仅给出一个明确定义的顺磁中心,初步确定为母体阴离子。