Tuning the structure and photoluminescent properties of mixed-anionic compounds of Eu(III) and Tb(III) by varying the ratio of benzoate and 3,5-difluorobenzoate anions in the composition

Tuning the structure and photoluminescent properties of mixed-anionic compounds of Eu(III) and Tb(III) by varying the ratio of benzoate and 3,5-difluorobenzoate anions in the composition Full article

Journal

Journal of Molecular Structure
ISSN: 0022-2860 , E-ISSN: 1872-8014

Output data

Year: 2026, Volume: 1374, Article number : 146759, Pages count : DOI: 10.1016/j.molstruc.2026.146759

Authors

Bolot'ko Alena E. ^1,2 , Shmelev Maxim A. ² , Voronina Julia K. ² , Varaksina Evgeniya A. ^2,3 , Chistyakov Aleksandr S. ² , Bovkunova Anna A. ² , Anisimov Alexey A. ^1,2 , Levina Anastasia A. ^4,2 , Lalov Andrey V. ⁴ , Gogoleva Natalia V. ² , Novoselov Aleksandr S. ⁵ , Taydakov Ilya V. ³ , Sidorov Alexey A. ² , Eremenko Igor L. ²

Affiliations

1	Higher School of Economics, Vavilova st, 7, 117312 Moscow, Russian Federation
2	N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prospect 31, 119991 Moscow, Russian Federation
3	P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospect, 53, 119991, Moscow, Russian Federation
4	N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect., 47, 119991 Moscow, Russian Federation
5	Chemistry Department, M.V. Lomonosov Moscow State University, Leninskye Gory 1, 3, 119991 Moscow, Russian Federation

It was established that the reaction of europium(III) or terbium(III) benzoate (bz-) with the corresponding 3,5-difluorobenzoate (dfb-) and 1,10-phenanthroline (phen) under different conditions leads to the formation of crystals of solid solutions [Ln2(phen)2(dfb)x(bz)6-x] (1Lnx, Ln = Eu (x = 0.6, 1.3, 1.6); Ln = Tb (x = 0.6)), [Eu2(phen)2(dfb)x(bz)6-x]*2MeCN (2Eux, x = 2.0, 2.7), [Eu2(phen)2(dfb)x(bz)6-x]*MeCN (3Eux, x = 4.45, 5.05, [Tb2(phen)2(dfb)2.5(bz)3.5]*2MeOH (5Tb2.5) with various structures, as well as a hexanuclear compound with no structural analogues [Eu6(phen)6(dfb)14.7(bz)3.3] (4Eu4.9). According to single-crystal X-ray diffraction data, all carboxylate anion positions in the resulting mixed anionic compounds were disordered and occupied simultaneously by bz- and dfb- anions in varying ratios. Variation of the anion ratio within the compounds allowed finetuning the system of structure-forming non-covalent interactions and influencing the molecular and supramolecular structure of the compounds and their photoluminescent properties. The obtained compounds were characterized by single-crystal and powder X-ray diffraction, infrared (IR) spectroscopy, simultaneous thermal analysis and CHN elemental analysis. Phase purity of compounds 1Eu0.6, 1Eu1.3, 1Eu1.6, 1Tb0.6, 2Eu2.7, 3Eu4.45, 3Eu5.05, 3Eu6 and 5Tb2.5 has been proven using powder X-ray diffraction. Furthermore, solid-state photoluminescence properties have been investigated for complexes 1Eu1.3, 1Tb0.6, 2Eu2.7, 3Eu4.45, 3Eu5.05, 3Eu6 and 5Tb2.5.

Bolot'ko A.E. , Shmelev M.A. , Voronina J.K. , Varaksina E.A. , Chistyakov A.S. , Bovkunova A.A. , Anisimov A.A. , Levina A.A. , Lalov A.V. , Gogoleva N.V. , Novoselov A.S. , Taydakov I.V. , Sidorov A.A. , Eremenko I.L.
Tuning the structure and photoluminescent properties of mixed-anionic compounds of Eu(III) and Tb(III) by varying the ratio of benzoate and 3,5-difluorobenzoate anions in the composition
Journal of Molecular Structure. 2026. V.1374. 146759 . DOI: 10.1016/j.molstruc.2026.146759 WOS Scopus OpenAlex

Submitted:	Apr 9, 2026
Accepted:	Jun 4, 2026
Published online:	Jun 5, 2026

≡ Web of science:	WOS:001800208000001
≡ Scopus:	2-s2.0-105041473959
≡ OpenAlex:	W7163642933