The reaction of DMPO as the spin trapping agent with nitrate radicals photocatalytically generated results in the formation of DMPOX showing a highly specific EPR spectrum. The method can be used as a semi‐quantitative and convenient way to detect nitrate radicals in non‐aqueous solutions/suspensions, which was never achieved up to now through EPR spectroscopy. Results support in a more direct way the proposed generation and reactivity of nitrate radicals in photocatalytic media and open a new chapter in the field of heterogeneous photocatalysis.

中文翻译：

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硝酸盐自由基和 DMPO 在非水介质中的反应：一种突出硝酸盐自由基在光催化过程中作用的新型检测工具


DMPO 作为自旋捕获剂与硝酸盐自由基光催化产生的反应导致 DMPOX 的形成，显示出高度特异性的 EPR 光谱。该方法可用作检测非水溶液/悬浮液中硝酸盐自由基的半定量便捷方法，这是迄今为止通过 EPR 波谱从未实现的。结果以更直接的方式支持了光催化介质中硝酸盐自由基的产生和反应性，并开启了非均相光催化领域的新篇章。