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Crystal structure, thermal decomposition behavior, and fluorescence property of lanthanide complexes with 2,4,6-trimethylbenzoic acid

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Abstract

Three new mononuclear lanthanide complexes [Ln(2,4,6-TMBA)3(terpy)(H2O)]·C2H5OH·H2O (Ln = Gd(1), Er(2) and [Tb(2,4,6-TMBA)3(terpy)(H2O)]·C2H5OH(3) (2,4,6-TMBA = 2,4,6-trimethylbenzoate, terpy = 2,2′:6′,2′-terpyridine) were synthesized by solution evaporation method with 2,4,6-trimethylbenzoic acid and 2,2′:6′,2′-terpyridine. These new lanthanide complexes were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray diffraction, and thermal analysis. The title complexes were found to be mononuclear units with the same coordination number of nine. The structures of the three lanthanide complexes could be divided into two types. The difference was that there were not only free ethanol molecules but also free water molecules in complexes 1–2, while there were only free ethanol molecules in complex 3. Thermogravimetry (TG), differential thermogravimetric (DTG), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR) were used to study the thermal behavior of complexes and the gas escaping from the thermal decomposition process. In addition, the fluorescence test showed that complex 3 had strong green luminescence properties, and the fluorescence lifetime of complex 3 was 0.637 ms.

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Acknowledgements

The research work was supported by the National Natural Science Foundation of China (No. 21803016).

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Authors and Affiliations

  1. Testing and Analysis Center, College of Chemistry& Material Science, Hebei Normal University, Shijiazhuang, 050024, People’s Republic of China

    Xin-Xin Wang, Jin-Jin Zhao, Jian-Jun Zhang & Shi-Kao Shi

  2. Hebei Key Laboratory of Heterocyclic Compounds, College of Chemical Engineering & Material, Handan University, Handan, 056005, People’s Republic of China

    Ning Ren

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  1. Xin-Xin Wang
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Correspondence to Jian-Jun Zhang.

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Wang, XX., Zhao, JJ., Zhang, JJ. et al. Crystal structure, thermal decomposition behavior, and fluorescence property of lanthanide complexes with 2,4,6-trimethylbenzoic acid. J Therm Anal Calorim 147, 10337–10349 (2022). https://doi.org/10.1007/s10973-022-11281-z

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