The ability of lanthanide ions to luminescence due to the chemical generation of electronically excited states *Ln(n ‒ 1)+ upon reduction of Lnn+ by a solvated electron in ultrasound-irradiated solutions has been demonstrated for the first time using Eu3+ and Ce4+ as an example. A solvated electron is formed by injection of electrons from a nonequilibrium plasma periodically generated by ultrasound in a moving bubble. The key stage of the found single-bubble sonochemiluminescence (SCL) is the reduction of Eu3+ and Ce4+ to, respectively, the bivalent and trivalent states by an electron solvated in water and ethylene glycol. It has been found that the SCL emitters are excited ions *Eu2+ and *Ce3+, which have, along with the ability to luminescence, high reducing properties (Eox ≤ –2.9 V). The latter factor determines the possibility of using ultrasonic generation of *Eu2+ and *Ce3+ in numerous reactions of organic synthesis and metal complex catalysis.

中文翻译：

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用溶剂化电子还原 Lnn+ 过程中镧系元素离子 Ln(n – 1)+ 的化学发光

使用 Eu3+ 和 Ce4+ 作为第一次证明了镧系元素离子发光的能力，这是由于在超声辐照溶液中 Lnn+ 被溶剂化电子还原后，电子激发态 *Ln(n ‒ 1)+ 的化学生成例子。溶剂化电子是通过从非平衡等离子体中注入电子而形成的，该等离子体由超声波在移动气泡中周期性产生。已发现的单气泡声化学发光 (SCL) 的关键阶段是通过溶剂化在水和乙二醇中的电子将 Eu3+ 和 Ce4+ 分别还原为二价和三价态。已经发现，SCL 发射体是激发离子 *Eu2+ 和 *Ce3+，它们除了具有发光能力外，还具有高还原性（Eox ≤ –2.9 V）。