We introduce a rapid method to test the photocatalytic activity of singlet‐oxygen‐producing photosensitizers using a batch cell, a LED laser and a conventional potentiostat. The strategy is based on coupling of photo‐oxidation of hydroquinone and simultaneous electrochemical reduction of its oxidized form at a carbon electrode in an organic solvent (methanol). This scheme gives an immediate response and avoids complications related to long‐term experiments such as oxidative photo‐degradation of photosensitizers and singlet oxygen traps by reactive oxygen species (ROS). Among the tested compounds, a fluoro‐substituted subphthalocyanine showed the highest photocurrent and singlet oxygen quantum yield (Φ_Δ) in comparison to phenoxy‐ and tert‐butyl‐substituted analogues, whereas the lowest photocurrents and yields were observed for aggregated and dimeric phthalocyanine complexes. The method is useful for fast screening of the photosensitizing activity and represents the first example of one‐pot coupling of electrochemical and photocatalytic reactions in organic media.

中文翻译：

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光电化学法测定可溶性光敏剂的光催化活性

我们介绍了一种快速方法，可使用批处理单元，LED激光器和常规稳压器来测试产生单线态氧的光敏剂的光催化活性。该策略基于对苯二酚的光氧化反应和同时在有机溶剂（甲醇）中的碳电极处电化学还原其氧化形式的耦合。该方案可立即做出反应，避免了与长期实验相关的复杂问题，例如光敏剂的氧化光降解和活性氧（ROS）引起的单线态氧陷阱。在这些测试的化合物中，氟取代的亚酞菁表现出最高的光电流和单线态氧量子产率（Φ _Δ相比），以苯氧基和叔丁基取代的类似物，而聚集和二聚的酞菁配合物的光电流和产率最低。该方法可用于快速筛选光敏活性，是有机介质中电化学和光催化反应的单罐耦合的第一个例子。