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Synthesis, crystal structure, thermal behavior, and fluorescence property of lanthanide complexes based on 2,6-dimethylbenzoic acid and 1,10-phenanthroline

Xin-Xin Wang, Ning Ren, Yuan-Yuan Ma, Li-Na Geng, and Jian-Jun Zhang

Testing and Analysis Center, Hebei Normal University, Shijiazhuang, People’s Republic of China



Received: 5 January 2022  Accepted: 1 April 2022


Three dinuclear lanthanide complexes were prepared using 2,6-dimethylbenzoic acid and 1,10-phenanthroline as main ligand and auxiliary ligand, namely: [Eu(2,6-DMBA)3(phen)]2(1), [Gd(2,6-DMBA)3(phen)]2·1.5H2O(2) and [Tb(2,6-DMBA)3(phen)]2·2.5H2O(3) (2,6-DMBA = 2,6-dimethylbenzoate; phen = 1,10-phenanthroline) and characterized by Raman spectroscopy, infrared spectroscopy, single crystal X-ray diffraction, elemental analysis and thermogravimetric analysis. Single-crystal X-ray diffraction shows that the three complexes were centered on 9 coordination Ln(III) ions and form a single hat tetragonal inverse prism geometry with surrounding nitrogen and oxygen atoms. The adjacent structural units form a 1D chain structure through C–HO hydrogen bond interaction. TG-DSC/FTIR was used to study the thermal decomposition mechanism of the complexes and the main components of gases escaping during the decomposition process. Solid-state fluorescence studies showed that complexes 1 and 3 emitted strong red and green light, respectively.

Graphical abstract

Keywords: Lanthanide complexes; Crystal structure; Thermal analysis; Luminescence property

Full paper is available at

DOI: 10.1007/s11696-022-02211-2


Chemical Papers 76 (8) 5267–5280 (2022)

Tuesday, April 16, 2024

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