The photolysis of cyclopentadienyl compounds of tin and mercury. Electron spin resonance spectra and electronic configuration of the cyclopentadienyl, deuteriocyclopentadienyl, and alkylcyclopentadienyl radicals
作者:Philip J. Barker、Alwyn G. Davies、Man-Wing Tse
DOI:10.1039/p29800000941
日期:——
mechanism. The introduction of alkyl groups breaks the degeneracy of the ψA and ψS molecular orbitals of the π-system by electron release, destabilising the ψS MO, and the e.s.r. spectrum reflects the spin density distribution in the configuration ψA2ψS1. Deuterium has a small but detectable perturbing effect: the ψA MO is destabilised by ca. 100 J mol–1, and thermal mixing of the two energy levels results
锡(IV)和汞(II)的环戊二烯基衍生物以及汞(II)的烷基环戊二烯基衍生物在溶液中发生光解,以显示合适的自由基RC 5 H 4 ·(es = R,H,D,Me,Et,Pr i或Bu t)。C 5 H 5 ·自由基是平均D 5 h对称的平面π自由基,在有机溴化物存在下,其光谱可能会通过电荷转移机制而变宽。引入烷基的破坏的简并性ψ甲和ψ小号通过电子释放的π系统的分子轨道,动摇ψ小号MO,和ESR光谱反映了配置的自旋密度分布ψ甲2 ψ小号1。氘具有小的但可检测的扰动的效果:ψ甲MO是通过不稳定约 为100J摩尔-1,并在配置的两个能级结果热混合ψ小号1.515 ψ甲1.485。这与共振积分β而不是库仑积分α的振动摄动模型兼容。