4,7-Substituted 1,10-phenanthroline-2,9-dicarboxamides: photophysics of ligands and their complexes with the Eu–Gd–Tb triad

Avagyan, N.A.; Lemport, P.S.; Polikovskiy, T.A.; Tsorieva, A.V.; Metlin, M.T.; Taydakov, I.V.; Zonov, R.V.; Lyssenko, K.A.; Vokuev, M.F.; Rodin, I.A.; Tarasevich, B.N.; Ustynyuk, Y.A.; Nenajdenko, V.G.

Авторы: Avagyan Nane A., Lemport Pavel S., Polikovskiy Trofim A., Tsorieva Alisia V., Metlin Mikhail T., Taydakov Ilya V., Zonov Roman V., Lyssenko Konstantin A., Vokuev Mikhail F., Rodin Igor A., Tarasevich Boris N., Ustynyuk Yuri A., Nenajdenko Valentine G.
Журнал: Dalton Transactions
Номер: 53
Год издания: 2024
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
Первая страница: 14469
DOI: 10.1039/d4dt01698j
Аннотация: The impact of substituents at the 4- and 7-positions of 1,10-phenanthroline-2,9-dicarboxamides on the photophysical properties of the ligands and their coordination compounds with the lanthanide triad—europium, gadolinium, and terbium—was analyzed. This study demonstrates how modification of the electronic nature of ligands through the incorporation of diverse functional groups affects the luminescence properties of their complexes. The introduction of various substituents leads to the appearance of intra-ligand or ligand-to-ligand charge transfer (CT) states. The highest luminescence efficiency was observed for LH·Eu(NO3)3 (Qin = 54.1% and QL = 9.6%), suggesting strong luminescence quenching of the CT state. It was found that a relatively low ΔE (∼3000 cm−1) supports direct energy transfer from S1 to T1 bypassing the CT state, even though it is outside Reinhoudt’s optimal range. The introduction of fluorines leads to the strongest luminescence quenching among all the substituents.
Добавил в систему: Авакян Нанэ Арменовна

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4,7-Substituted 1,10-phenanthroline-2,9-dicarboxamides: photophysics of ligands and their complexes with the Eu–Gd–Tb triadстатья

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