Infrared and UV–vis spectra of phenoxonium cations produced during the oxidation of phenols with structures similar to vitamin E
作者:Shanshan Chen、Hong Mei Peng、Richard D. Webster
DOI:10.1016/j.electacta.2010.07.096
日期:2010.12
Several phenols with structures similar to vitamin E were oxidised and the intermediate species produced were characterised by in situ infrared and UV–vis spectroscopies. The Fourier transform infrared (FTIR) measurements were performed by chemically oxidising the phenols with 2 mol equiv. of NO+SbF6− in CH3CN and recording the spectra between 1900 and 1300 cm−1 with an attenuated total reflectance
几种具有类似于维生素E的结构的酚被氧化,产生的中间物种通过原位红外和紫外可见光谱进行表征。通过用2摩尔当量化学氧化苯酚来进行傅里叶变换红外(FTIR)测量。NO的+的SbF 6 -的CH 3 CN和记录1900和1300厘米光谱-1与衰减全反射利用(ATR)探针的纤维导管和金刚石复合传感器。形成长寿命苯氧鎓阳离子的化合物在1665(±15)cm -1处显示出两种红外吸收,在1600(±10)cm -1处显示出一种红外吸收。与羰基,对称环拉伸和不对称环拉伸模式相关。对苯醌是酚氧化的长期产物之一,并且在1650(±10)cm -1处显示出溶液相的IR吸光度。在苯酚氧化过程中进行的原位电化学UV-vis实验导致检测到条带,这是由于在295(±5)和440(±15)nm处的苯氧鎓阳离子以及在260(±10)nm处的对醌)nm。底物的浓度和溶剂的水含量对在氧化反应过程中产生的中间体和产物的收率有重大影响。