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光敏还原甲基紫精的产物,正离子自由基(MV~+)的吸收光谱(ε_(605)=1.1×10~4,ε_(395)=3.3×10~4)和敏化剂的吸收光谱重叠。光照过程中产生的MV~+,与敏化剂竞争光子,产生屏蔽作用。随着MV~+浓度的增大,敏化剂在单位时间内所吸收光子数逐渐下降,进而影响这反应量子产率的测定。应用Rougee等人报道的关系式,对敏化剂所吸收光子分数进行校正,得到一较准确的测定量子产率的方法。全部数据处理在APPLE Ⅱ微机上进行,操作简单,计算快捷。这方法可推广应用到其他产物和吸光分子有重叠吸收光谱的光反应中。
The photoreduction of methyl viologen, the absorption spectrum of positive ion radical (ε ~ (605) = 1.1 × 10 ~ 4, ε_ (395) = 3.3 × 10 ~ 4) and the absorption of sensitizer Spectral overlap. Light generated during the MV ~ +, photon competition with the sensitizer, resulting in shielding effect. With the increase of MV ~ + concentration, the number of photons absorbed by the sensitizer gradually decreased in unit time, which in turn affected the determination of the quantum yield of this reaction. Using the relation reported by Rougee et al., The photon fraction absorbed by the sensitizer is corrected to obtain a more accurate method for determining the quantum yield. All data processing in the APPLE Ⅱ microcomputer, simple operation, quick calculation. This method can be extended to other products and the absorption of light-absorbing molecules have overlapping absorption spectra of light.