Citation: Xin MA, Ya SUN, Na SUN, Qian KANG, Jiajia ZHANG, Ruitao ZHU, Xiaoli GAO. A Tb₂ complex based on polydentate Schiff base: Crystal structure, fluorescence properties, and biological activity[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(7): 1347-1356. doi: 10.11862/CJIC.20230357 shu

A Tb₂ complex based on polydentate Schiff base: Crystal structure, fluorescence properties, and biological activity

College of Chemistry and Materials, Taiyuan Normal University, Jinzhong, Shanxi 030619, China

Corresponding author: Xiaoli GAO, gaoxl@tynu.edu.cn
Received Date: 27 September 2023
Revised Date: 12 May 2024

Figures(10)

A new lanthanide binuclear Tb(Ⅲ)-based complex with the formula [Tb₂(L)(H₂L)]·2CH₃OH·CH₃CN (1) have been synthesized via the solvothermal method by using a polydentate Schiff base ligand (H₄L=N', N″-((1E, 1'E)-(1, 10 -phenanthroline-2, 9-diyl) bis (methaneylylidene)) bis (2-hydroxybenzohydrazide)) reacting with Tb(acac)₃·2H₂O (acac^-=acetylacetonate). It was characterized by IR, elemental analysis, single-crystal and powder X-ray diffraction. Single-crystal X-ray structure analysis reveals that complex 1 belongs to the triclinic system with $P \overline{1}$ space group, and the asymmetric unit mainly includes two Tb^Ⅲ ions and two different deprotonated ligands (L^4- and H₂L^2-). Both centre Tb1 and Tb2 ions are nine-coordinated with a [N₄O₅] coordination environment. The coordination geometry is shown as a distorted hula-hoop. In addition, the biological activity study shows that the complex has stronger antibacterial activity than H₄L and Tb(acac)₃·2H₂O. The interaction between 1 and DNA was studied by UV-Vis spectroscopy, cyclic voltammetry, gel electrophoresis, and fluorescence spectroscopy. The results reveal that 1 could bind to calf thymus DNA mainly by intercalation. Ethidium bromide (EB) displacement experiments indicated that Stern-Volmer quenching constants of complexes 1 and H₄L were 1.04 and 0.30, respectively.
- Tb₂ complex,
- biological activity,
- DNA action,
- fluorescence property,
- crystal structure
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A Tb2 complex based on polydentate Schiff base: Crystal structure, fluorescence properties, and biological activity

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A Tb₂ complex based on polydentate Schiff base: Crystal structure, fluorescence properties, and biological activity