Electron transfer in the excited state of hydroquinone
Electron transfer in the excited state of hydroquinone
复制标题
对苯二酚激发态的电子转移
DOI：
10.1021/j100867a029
复制
发表时间：
1967
期刊：
影响因子：
--
通讯作者：
Nurith Shaklay
中科院分区：
文献类型：
--
作者：
J. Feitelson;Nurith Shaklay
结果5×10~5M对苯二酚在酸性(pH~1)和中性(pH~6)中的水溶液在280µm处发光。它们在峰值330微米处的荧光强度是钴氰络合物浓度的函数。络合物在这些波长的吸收较低(在激发波长和荧光波长的摩尔吸收系数分别为e 100和150 1./cm摩尔)。然而，由于溶液中浓度较高的钴络合物对对苯二酚荧光的部分吸收，结果必须对内滤波效应进行修正。不需要对入射光的吸收进行校正，因为在总的吸光度下，溶液的每一组分都会吸收一定比例的光。7首次绘制了荧光随钴络合物浓度变化的曲线图，得到了常规的Stern-Volmer猝灭常数。然后，通过威勒指数双曲型方程对结果进行了不同控制反应中的瞬变项的修正。
ResultsAqueous solutions of 5 X 10~ 5 M hydroquinone in acidic (pH~ 1) and neutral (pH~ 6) solution were il-luminated at 280 µ. The intensity of their fluores-cence at its peak of 330 µ was determined as a func-tion ofthe cobalticyano complex concentration. The absorption of the complex at these wavelengths is low.(At the wavelengths of excitation and of fluorescence the molar absorption coefficients are e 100 and 150 1./cm mole, respectively.) Nevertheless, the results had to be corrected for the inner filter effect due to the par-tial absorption of the hydroquinone fluorescence by the cobalti complex which was present at relatively high concentrations in solutions. No correction was necessary for the incident light absorption since atlow over-all absorbance each component of thesolution absorbs a constant fraction of the light. 7 The change in fluorescence as a function of cobalticomplex concentration was first plotted to obtain the conventional Stern-Volmer quenching constant. The result was then corrected for the transient term in dif-fusion-controlled reactions by Weller’s exponential hyperbolic equation4