Why europium acylpyrazolonates are bad phosphors: lessons learned from the study of ionic and polymer complexes [MLnQ4], M = NEt4 +, Ag+

Belousov, Y.A.; Polikovsky, T.A.; Metlin, M.T.; Shikin, D.D.; Gontcharenko, V.E.; Lyssenko, K.A.; Drozdov, A.A.; Korshunov, V.M.; Taydakov, I.V.; Marchetti, F.; Pettinari, C.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 марта 2026 г.

Авторы: Belousov Yuriy A., Polikovsky Trofim A., Metlin Mikhail T., Shikin Daniil D., Gontcharenko Victoria E., Lyssenko Konstanin A., Drozdov Andrey A., Korshunov Vladislav M., Taydakov Ilya V., Marchetti Fabio, Pettinari Claudio
Журнал: Dalton Transactions
Год издания: 2026
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d5dt02746b
Аннотация: Our series of works on acylpyrazolonates of lanthanides has shown that although these beta-diketonateligands are effective in sensitizing the luminescence of Tb3+, Dy3+, and Sm3+ ions, and the IR-emittingYb3+ ion, there is typically a sharp drop in efficiency in the case of Eu3+. To investigate this phenomenon,three series of complexes of samarium, europium, and gadolinium with the ligand 4-benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (HQPh) were synthesized, namely [LnQ3(H2O)(dmf)] (Ln-1) (dmf= N,N-dimethylformamide), [NEt4][LnQ4] (Ln-2), and {AgLnQ4}n (Ln-3). The structures of these compoundswere determined by single-crystal X-ray diffraction analysis, which showed that series Ln-1 consistsof molecular complexes held together by hydrogen bonds, series Ln-2 consists of ionic crystals, andseries Ln-3 consists of coordination polymers in which silver ions are coordinated by nitrogen atoms ofthe pyrazole rings, forming infinite chains. The study of optical properties revealed that for europium ions,efficient quenching occurs through an LMCT state, with the highest efficiency observed for the complexEu-1. The transition from the ammonium salts Sm-2, Eu-2 to the heterometallic complexes Sm-3 andEu-3 is also accompanied by some unexpected luminescence quenching.
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Why europium acylpyrazolonates are bad phosphors: lessons learned from the study of ionic and polymer complexes [MLnQ4], M = NEt4 +, Ag+статья Исследовательская статья

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