Yaghmaei Mahzad, Scaiano Juan C
Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada.
Photochem Photobiol Sci. 2023 Aug;22(8):1865-1874. doi: 10.1007/s43630-023-00417-1. Epub 2023 Apr 18.
This contribution addresses a frequent problem in flow photochemistry, where methodologies to determine the quantum efficiency of photoreactions are totally lacking. In spite of numerous studies being available in the literature, product reaction yields are never accompanied by measurements to determine their quantum yields. Basically, the key reagent in the reaction, light, is not measured under the experimental conditions of exposure. We report here a flow actinometer based on the photochemistry of valerophenone that can be readily implemented in the organic laboratory for irradiations in the UV region. For example for UVB lamps used in our work, the irradiance was measured as 1.1 × 10 einstein l s. Our photoreactor design involves wrapping low-pressure lamps with Teflon tubbing, where the photochemistry takes place. Similar strategies could be implemented with other geometries or with lamps (e.g. LED) and actinometers with sensitivity in other spectral regions.
本文论述了流动光化学中一个常见的问题，即完全缺乏测定光反应量子产率的方法。尽管文献中有大量研究，但产物反应产率从未伴随着测定其量子产率的测量。基本上，反应中的关键试剂光，在曝光的实验条件下未被测量。我们在此报告一种基于苯戊酮光化学的流动光量计，它可以很容易地在有机实验室中用于紫外区域的辐照。例如，对于我们工作中使用的UVB灯，测得的辐照度为1.1×10爱因斯坦·升·秒。我们的光反应器设计包括用特氟龙管包裹低压灯，光化学反应就在这里发生。类似的策略可以应用于其他几何形状或具有其他光谱区域灵敏度的灯（如LED）和光量计。
