Nine mercapto-azobenzene dervatives with "push-pull" structure are synthesized.The synthesis procedure is simple and easily operated.The structures of the compounds are characterized and confirmed by element...Nine mercapto-azobenzene dervatives with "push-pull" structure are synthesized.The synthesis procedure is simple and easily operated.The structures of the compounds are characterized and confirmed by elementary analysis,1H-NMR,IR and UV.These compounds will be novel function material molecules in the field of molecular electronics.展开更多
文摘Nine mercapto-azobenzene dervatives with "push-pull" structure are synthesized.The synthesis procedure is simple and easily operated.The structures of the compounds are characterized and confirmed by elementary analysis,1H-NMR,IR and UV.These compounds will be novel function material molecules in the field of molecular electronics.
文摘推拉效应（captodative effect）指的是,当自由基中心原子上同时连有推电子基及吸电子基时,该自由基具特殊稳定性的现象.近年来,许多化学工作者对此产生了很大的兴趣.研究该效应的方法,主要有理论计算及实验考察.Crans、Leroy等用ab initio 法首先计算了一些简单有机自由基的推拉效应.Pasto 最近探讨了动力学及热力学推拉效应.我们对氨基酸自由基作过考察,发现其有较大的推拉效应.最近,我们对α-氯甲硫醚自由基的稳定性进行了ab initio 计算.结果表明其热力学推拉效应值ΔE<sub>cd</sub><sup>T</sup> 及动力学推拉效应值ΔE<sub>cd</sub><sup>K</sup> 都小于零.我们先在STO-3G
