Modulating the energy transfer processes via XPh 3 (X = Si, Ge, Sn) substitution in luminescent Eu 3+ β-diketonate complexes

Modulating the energy transfer processes via XPh 3 (X = Si, Ge, Sn) substitution in luminescent Eu 3+ β-diketonate complexes Full article

Journal

Dalton Transactions
ISSN: 1477-9234 , E-ISSN: 1477-9226

Output data

Year: 2026, Volume: 55, Pages: 8517-8529 Pages count : 13 DOI: 10.1039/d6dt00437g

Authors

Varaksina Evgeniya A. ¹ , Ferulev Alexey I. ^2,1 , Korshunov Vladislav M. ^2,1 , Stankevich Tatyana S. ^3,1 , Gontcharenko Victoria E. ^4,1 , Taydakov Ilya V. ^4,1

Affiliations

1	P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy Prospect, 119991 Moscow, Russia
2	Bauman Moscow State Technical University, 5/1 2-ya Baumanskaya str., 105005 Moscow, Russia
3	N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, 47 Leninskiy Prospect, 119991 Moscow, Russia
4	Faculty of Chemistry, National Research University Higher School of Economics, 20 Miasnitskaya Str., Moscow 101000, Russia

A series of novel Eu3+ complexes with group 14 element-containing β-diketone ligands were synthesized and their photoluminescence properties were studied in detail. The introduction of electron-donating XPh3 groups (X = Si, Ge, Sn) into the phenyl ring of the well-known BTFA β-diketone ligand was found to lower the energy of the ligand triplet excited state T1. Along the Si–Ge–Sn series, this results in a progressively reduced energy gap between the excited triplet state T1 and ligand-to-metal charge transfer (LMCT) states. This provides an efficient channel for quenching the ligand excitation via the LMCT channel. As a result, a gradual decrease in the overall luminescence quantum yield is observed, identifying the Si-based derivative as the most efficient luminescent complex among substituted derivatives. The experimental findings were supported by theoretical calculations using the TD-DFT method.

Varaksina E.A. , Ferulev A.I. , Korshunov V.M. , Stankevich T.S. , Gontcharenko V.E. , Taydakov I.V.
Modulating the energy transfer processes via XPh 3 (X = Si, Ge, Sn) substitution in luminescent Eu 3+ β-diketonate complexes
Dalton Transactions. 2026. V.55. P.8517-8529. DOI: 10.1039/d6dt00437g WOS Scopus OpenAlex

Submitted:	Feb 18, 2026
Published online:	May 9, 2026

≡ Web of science:	WOS:001771557300001
≡ Scopus:	2-s2.0-105039439036
≡ OpenAlex:	W7160712318