Citation: Zihe SONG, Jinjin ZHAO, Ning REN, Jianjun ZHANG. Crystal structure, thermal analysis, and luminescence properties of six heterocyclic lanthanide complexes[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(1): 181-192. doi: 10.11862/CJIC.20250126 shu

Crystal structure, thermal analysis, and luminescence properties of six heterocyclic lanthanide complexes

Zihe SONG ¹ ,
Jinjin ZHAO ^1,, ,
Ning REN ^2,, ,
Jianjun ZHANG ^1,,

1.
Testing and Analysis Centre, College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang 050024, China
2.
Hebei Key Laboratory of Heterocyclic Compounds and Hebei Center for New Inorganic Optoelectronic Nanomaterial Research, College of Chemical Engineering & Material, Handan University, Handan, Hebei 056005, China

Corresponding author: Jinjin ZHAO, jjzhang6@126.com Ning REN, ningren9@163.com Jianjun ZHANG, zhaojinjin@hebtu.edu.cn
Received Date: 14 April 2025
Revised Date: 26 September 2025

Figures(9)

Six new lanthanide complexes: [Ln(3,4-DEOBA)₃(4,4′-DM-2,2′-bipy)]₂·2C₂H₅OH, [Ln=Dy (1), Eu (2), Tb (3), Sm (4), Ho (5), Gd (6); 3,4-DEOBA^-=3,4-diethoxybenzoate, 4,4′-DM-2,2′-bipy=4,4′-dimethyl-2,2′-bipyridine] were successfully synthesized by the volatilization of the solution at room temperature. The crystal structures of six complexes were determined by single-crystal X-ray diffraction technology. The results showed that the complexes all have a binuclear structure, and the structures contain free ethanol molecules. Moreover, the coordination number of the central metal of each structural unit is eight. Adjacent structural units interact with each other through hydrogen bonds and further expand to form 1D chain-like and 2D planar structures. After conducting a systematic study on the luminescence properties of complexes 1-4, their emission and excitation spectra were obtained. Experimental results indicated that the fluorescence lifetimes of complexes 2 and 3 were 0.807 and 0.845 ms, respectively. The emission spectral data of complexes 1-4 were imported into the CIE chromaticity coordinate system, and their corresponding luminescent regions cover the yellow light, red light, green light, and orange-red light bands, respectively. Within the temperature range of 299.15-1 300 K, the thermal decomposition processes of the six complexes were comprehensively analyzed by using TG-DSC/FTIR/MS technology. The hypothesis of the gradual loss of ligand groups during the decomposition process was verified by detecting the escaped gas, 3D infrared spectroscopy, and ion fragment information detected by mass spectrometry. The specific decomposition path is as follows: firstly, free ethanol molecules and neutral ligands are removed, and finally, acidic ligands are released; the final product is the corresponding metal oxide.
- lanthanide complexes,
- fluorescence property,
- crystal structure,
- thermal analysis
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