Sensitivity-Range Integral (SRI): a novel approach to evaluating and optimizing luminescent thermometers. A case study of thermometric properties governed by intermolecular CT states in isomeric Eu/Tb coordination compounds

Polikovskiy, T.A.; Gontcharenko, V.E.; Lishova-Dvoretskaya, S.D.; Islamov, M.M.; Belousov, Y.A.; Taydakov, I.V.

Авторы: Polikovskiy Trofim A., Gontcharenko Victoria E., Lishova-Dvoretskaya Sofia D., Islamov Marat M., Belousov Yury A., Taydakov Ilya V.
Журнал: Journal of Materials Chemistry С
Год издания: 2026
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d5tc03645c
Аннотация: The design of lanthanide-based molecular thermometers remains a major challenge, as their temperature sensitivity is strongly governed by subtle structural factors and the presence of competing relaxation pathways. A novel metric to compare the application potential was proposed: Sensitivity-Range Integral (SRI). The SRI accounts for both sensitivity and operating range, providing clearer performance insights. In this work, we investigate Eu3+, Tb3+, and mixed-metal Eu/Tb coordination compounds [LnL3(bipy)] with two structurally isomeric ligands: 4,4,4-trifluoro-1-(1-methyl-1H-pyrazol-3-yl)butane-1,3-dione (HL1) and 4,4,4-trifluoro-1-(1-methyl-1H-pyrazol-5-yl)butane-1,3-dione (HL2). Both ligand isomers form neutral mononuclear complexes with square-antiprismatic Ln3+ coordination environments, but distinct intermolecular interactions enable different intermolecular charge-transfer (CT) states, which modulate the temperature-dependent luminescence response. Mixed-metal Eu/Tb complexes show excellent relative thermal sensitivities 6.0% × K−1 for Eu/TbL1 and 8.5% × K−1 for Eu/TbL2. The achieved SRI values for the investigated compounds are the highest among any earlier reported thermometers: 734% for Eu/TbL1 and 970% for Eu/TbL2. These results highlight the crucial role of ligand design and CT states in tuning the performance of molecular luminescent thermometers and provide design guidelines for the next generation of lanthanide-based optical sensors.
Добавил в систему: Белоусов Юрий Александрович

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Sensitivity-Range Integral (SRI): a novel approach to evaluating and optimizing luminescent thermometers. A case study of thermometric properties governed by intermolecular CT states in isomeric Eu/Tb coordination compoundsстатья Исследовательская статья

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