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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >A new single pulse method for the measurements of photosensitized singlet oxygen quantum yield
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A new single pulse method for the measurements of photosensitized singlet oxygen quantum yield

机译：一种测量光敏单重态氧量子产率的新单脉冲方法

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摘要

A new simpler relative method for estimating photosensitized singlet oxygen quantum yield has been developed. In this method a strong depletion signal is observed when porphyrin (2 #mu#M) and 1,3-diphenylisobenzofuran (DPBF, 500 #mu#M) are irradiated using second harmonic 532 nm Nd-YAG laser pulse and monitored at 410 or 415 nm by a ultraviolet filtered white light. The observed depletion is attributed to the reaction of DPBF with sensitized single oxygen. The amplitude of the depletion signal is related directly to the singlet oxygen sensitization yield. Appropriate kinetic equations have been derived to relate the change in the absorbance of DPBF and singlet oxygen quantum yield. The singlet oxygen quantum yields of fifteen porphyrins and metalloporphyrins have been investigated in dimethylformamide solution. The results are compared with the quantum yields obtained by the usual kinetic run experiments. The results are found to match exceedingly well in the two methods.
机译：已经开发了一种新的相对简单的估计光敏单线态氧量子产率的相对方法。在此方法中，当使用二次谐波532 nm Nd-YAG激光脉冲照射卟啉（2＃mu＃M）和1,3-二苯基异苯并呋喃（DPBF，500＃mu＃M）并在410或420 nm处监测时，观察到强烈的耗尽信号。用紫外线过滤的白光照射到415 nm。观察到的损耗归因于DPBF与致敏单氧的反应。耗尽信号的幅度与单重态氧敏化产率直接相关。推导了适当的动力学方程，以关联DPBF吸光度的变化和单重态氧量子产率。在二甲基甲酰胺溶液中研究了十五种卟啉和金属卟啉的单线态氧量子产率。将结果与通过常规动力学运行实验获得的量子产率进行比较。发现两种方法的结果非常匹配。

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