Citation: Xiaoqi LAN, Wei LI, Long JING, Mengyu SU, Xiaoling LUO, Zheng LIU, Qun TANG. Synthesis, crystal structure, and spectral properties of transition-metal-organic frameworks based on thiophene carboxylic acid ligands[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(2): 309-316. doi: 10.11862/CJIC.20250212 shu

Synthesis, crystal structure, and spectral properties of transition-metal-organic frameworks based on thiophene carboxylic acid ligands

Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemical and Biological Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China

Corresponding author: Wei LI, liwei1986gllg@163.com Zheng LIU, lisa4.6@163.com Qun TANG, tangq@glut.edu.cn
Received Date: 20 June 2025
Revised Date: 21 October 2025

Figures(8)

Two transition-metal-organic frameworks, {[Co₂(L)₂(4, 4′-bipy)₂(H₂O)₄]·H₂O}_n (Co-MOF) and {[Mn(L)(4, 4′-bipy)_0.5(H₂O)₂]·H₂O}_n (Mn-MOF), were prepared by solvothermal synthesis using 2, 5-dibromothiophene-3, 4- dicarboxylic acid (H₂L) and 4, 4′-bipyridine (4, 4′-bipy) as ligands, respectively, with cobalt nitrate hexahydrate and manganese acetate tetrahydrate. Their structures and spectroscopic properties were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, infrared spectroscopy, UV-Vis spectroscopy, fluorescence spectroscopy, and thermogravimetric analysis methods. The results show that the Co(Ⅱ) of Co-MOF has two coordination forms: centrosymmetric and linear binuclear. The Co(Ⅱ) ions are all bridged by 4, 4′-bipy, extended into a 2D layered structure through hydrogen bonds, and finally, a 3D network structure is constructed by the cross- linking effect of interlayer hydrogen bonds. The Mn(Ⅱ) of Mn-MOF is connected into six-membered rings through L^2- ligand bridges, with 4, 4′-bipy bridges between each six-membered ring. Additionally, L^2- ligands are stacked along the c-axis to form a 3D honeycomb structure with two different 1D channels. These two distinct structural modes stem from the different coordination geometric configurations of the metal center.
- metal-organic framework,
- 2, 5-dibromo-3, 4-thiophenedicarboxylic acid,
- crystal structure,
- spectroscopic properties
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