From para- and meta-methoxy-substituted enaminedione derivatives to ortho-substituted one: effect on structure and photoluminescent properties of lanthanide(III) complexes

From para- and meta-methoxy-substituted enaminedione derivatives to ortho-substituted one: effect on structure and photoluminescent properties of lanthanide(III) complexes Full article

Journal

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

Output data

Year: 2026, Volume: 1352, Article number : 144372, Pages count : 9 DOI: 10.1016/j.molstruc.2025.144372

Tags

Lanthanide(III) coordination compounds, Mononuclear complexes, Enaminone, Photoluminescence, Crystal structure, π-π stacking

Authors

Smirnova Ksenia S. ¹ , Sanzhenakova Elizaveta A. ¹ , Pozdnyakov Ivan P. ² , Russkikh Alena A. ³ , Dotsenko Victor V. ³ , Lider Elizaveta V. ¹

Affiliations

1	Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia
2	Voevodsky Institute of Chemical Kinetics and Combustion, SB RAS, Novosibirsk, Russia
3	Kuban State University, Krasnodar, Russia

This research is devoted to the synthesis of lanthanide(III) coordination compounds with enaminone derivative (2-{[(2-methoxyphenyl)amino]methylene}-5,5-dimethylcyclohexane-1,3‑dione, L) and investigation of their photoluminescent properties. Two types of mononuclear compounds – [LnL3(NO3)3] (Ln3+= Eu, Sm, Tb, Dy) and [LnL2(H2O)(NO3)3] (Ln3+= Sm, Tb, Gd) – have been obtained. The composition and structure have been confirmed by IR spectroscopy, elemental analysis, single-crystal X-ray diffraction, and powder X-ray diffraction. According to single-crystal X-ray diffraction analysis, the ligand exhibits a monodentate coordination mode. The presence of π-π stacking or intermolecular hydrogen bonds results in the packing as layer or chain. The photoluminescence of the ligand and lanthanide(III) complexes is studied in the polycrystalline state. Energy transfer from the ligand to the lanthanide ions occur in the case of europium(III) and samarium(III) compounds. The quantum yield of ligand equals to 49 %, as for complexes – less than 1 %, while luminescence lifetime is in nanosecond region for L and in millisecond – for europium(III) compound. The color purity is found ⁓ 60 % for ligand and europium(III) complex.

Smirnova K.S. , Sanzhenakova E.A. , Pozdnyakov I.P. , Russkikh A.A. , Dotsenko V.V. , Lider E.V.
From para- and meta-methoxy-substituted enaminedione derivatives to ortho-substituted one: effect on structure and photoluminescent properties of lanthanide(III) complexes
Journal of Molecular Structure. 2026. V.1352. 144372 :1-9. DOI: 10.1016/j.molstruc.2025.144372 WOS OpenAlex

Submitted:	May 22, 2025
Accepted:	Oct 11, 2025
Published online:	Oct 13, 2025
Published print:	Feb 15, 2026

Web of science:	WOS:001605753100014
OpenAlex:	W4415121998

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