Citation: Xiao-Yan XIN, Feng-Jiao CHEN, Wen-Yu LI, Jie WANG, Chen YANG, Min LI, Ying SHI, Wen-Min WANG. Crystal structure, fluorescence properties, and biological activity of Ln^Ⅲ₂ complexes based on Schiff base ligand[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(1): 1-12. doi: 10.11862/CJIC.2022.268 shu

Crystal structure, fluorescence properties, and biological activity of Ln^Ⅲ₂ complexes based on Schiff base ligand

Xiao-Yan XIN ¹ ,
Feng-Jiao CHEN ¹ ,
Wen-Yu LI ¹ ,
Jie WANG ¹ ,
Chen YANG ¹ ,
Min LI ² ,
Ying SHI ^2,, ,
Wen-Min WANG ^{1, 2,,}

1.
College of Chemistry and Materials, Taiyuan Normal University, Jinzhong, Shanxi 030619, China
2.
Institute for Carbon Neutrality, Taiyuan Normal University, Jinzhong, Shanxi 030619, China

Corresponding author: Ying SHI, lucia0812@163.com Wen-Min WANG, wangwenmin0506@126.com
Received Date: 12 July 2022
Revised Date: 11 November 2022

Figures(11)

Three new binuclear Ln-based complexes with the formula [Ln₂(acac)₂(L)₂(C₂H₅OH)₂] (Ln=Tb (1), Ho (2), Er (3); acac^-=acetylacetonate) have been synthesized via the solvothermal method by using a polydentate Schiff base ligand (H₂L=(E)-N'-(3-ethoxy-2-hydroxyb enzylidene)-3-hydroxypicolinohydrazide) reacting with Ln(acac)₃·2H₂O. Single-crystal X-ray structures reveal that complexes 1-3 are mainly composed of two Ln^Ⅲ ions, two acac^- ions, two L^2- ions, two C₂H₅OH molecules, and the two central Ln^Ⅲ ions are connected by two μ₂-O atoms forming a"parallelogram-shaped"Ln₂O₂ core. The solid-state fluorescence property shows that the emission spectrum of complex 1 exhibited the characteristic emissions of Tb^Ⅲ ions under the excitation of 296 nm. For complex 1, four characteristic emission peaks were observed at 490, 545, 585, and 620 nm, corresponding to the transitions of Tb^Ⅲ ion from ⁵D₄ to ⁷F_J (J=6, 5, 4, 3). In addition, the biological activity study shows that complexes 1-3 had stronger antibacterial activity than H₂L and Ln(acac)₃·2H₂O. The interaction between complexes 1-3 and DNA was studied by ultraviolet spectroscopy, cyclic voltammetry, gel electrophoresis, and fluorescence spectroscopy. The results reveal that complexes 1-3 could bind to calf thymus DNA mainly by intercalation.
- Ln₂ complexes,
- crystal structures,
- fluorescence properties,
- biological activity,
- DNA-binding
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Crystal structure, fluorescence properties, and biological activity of LnⅢ2 complexes based on Schiff base ligand

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Crystal structure, fluorescence properties, and biological activity of Ln^Ⅲ₂ complexes based on Schiff base ligand