Citation: Shi-Xiong LI, Yu-Huan CHEN, Shao-Long YANG, Mu-Lun YAN, Cheng-Ting WEI. Synthesis, structure and fluorescence analysis of three Zn(Ⅱ) complexes based on (1-methyl-1H-benzimidazol-2-yl) methanol[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(9): 1782-1790. doi: 10.11862/CJIC.2023.146 shu

Synthesis, structure and fluorescence analysis of three Zn(Ⅱ) complexes based on (1-methyl-1H-benzimidazol-2-yl) methanol

1.
School of Mechanical and Resource Engineering, Wuzhou University, Wuzhou, Guangxi 543003, China
2.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

Corresponding author: Shi-Xiong LI, lsx1324@163.com
Received Date: 25 March 2023
Revised Date: 6 June 2023

Figures(7)

The (1-methyl-1H-benzimidazol-2-yl) methanol (HL) reacted with Zn(NO₃)₂·6H₂O and ZnCl₂ in a mixture of methanol and acetonitrile to generate three Zn(Ⅱ) complexes: [Zn(HL)₂Cl₂] (1), [Zn(HL)₂(H₂O)₂](NO₃)₂ (2), and [Zn₄(L)₄Cl₄] (3). Their structures were analyzed by elemental analysis, IR, thermogravimetry, and single-crystal X-ray diffraction. The results show that 1 and 2 are mononuclear complexes, and 3 is a tetranuclear complex. The thermogravimetric analysis results show that these complexes had good thermal stability and the structure began to decompose when the temperature exceeded 180 ℃. The fluorescence analysis shows that complexes 1 and 2 had a red shift phenomenon, and when the ligand lost proton H, complex 3 had a significant blue shift phenomenon. The quantum yields of complexes 1, 2, and 3 were 1.00%, 0.78%, and 2.04%, respectively. And the fluorescence lifetimes were 2.306 0, 2.283 6, and 3.039 9 ns, respectively. Therefore, it is possible to enhance the fluorescence lifetime by causing the ligand to lose proton H and form a polynuclear complex.
- complex,
- crystal,
- structure,
- fluorescence
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