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Chemiluminescence of Lanthanide Ions Ln(n – 1)+ during Reduction of Lnn+ with a Solvated Electron
Doklady Physical Chemistry  (IF0.638),  Pub Date : 2020-10-01, DOI: 10.1134/s0012501620100024
B. M. Gareev, K. S. Vasilyuk, D. I. Galimov, G. L. Sharipov, U. M. Dzhemilev

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.