Citation: Liyang ZHANG, Dongdong YANG, Ning LI, Yuanyu YANG, Qi MA. Crystal structures, luminescent properties and Hirshfeld surface analyses of three cadmium(Ⅱ) complexes based on 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(10): 1943-1952. doi: 10.11862/CJIC.20240079 shu

Crystal structures, luminescent properties and Hirshfeld surface analyses of three cadmium(Ⅱ) complexes based on 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate

School of Chemistry and Environmental Engineering, Shanxi Datong University, Datong, Shanxi 037009, China

Corresponding author: Qi MA, maqihx@163.com
Received Date: 13 March 2024
Revised Date: 30 August 2024

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We have successfully synthesized three cadmium(Ⅱ) complexes [Cd(Hppb)₂Br₂] (1), [Cd₂(ppb)₂Br₂] (2) and [Cd(Hppb)Br₂]_n (3) in which the bromide ions are involved based on an asymmetric ligand 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate (Hppb). Employment of different synthetic conditions has resulted in different architectures. In the three complexes, the ratios of Cd(Ⅱ) ions, ligands, and bromide ions were 1∶2∶2, 1∶1∶1, and 1∶1∶2, respectively, resulting in different structures of mononuclear (0D), binuclear (0D), and 1D framework. The Cd(Ⅱ) coordinated environments in 1 are slightly distorted octahedral geometries, but central ions in 2 and 3 display distorted square pyramidal geometries. There are obvious differences in the ligation modes of the ppb^- or Hppb ligands for both complexes. In 1, two Hppb ligands display μ₁-κN, N′ coordination modes. In 2, two ppb^- ligands display μ₂-κN, N′∶κO coordination modes. Two ppb^- ligands act as two μ_{1, 1}-bridges linking the binuclear Cd(Ⅱ) cations with a distance of 0.409 1(4) nm. In 3, the neutral Hppb ligands exhibit a μ₂-κN, N′∶κO coordination mode, and connecting Cd(Ⅱ) ions by μ_{1, 6}-bridges and forming an infinite 1D chain along the b-axis. The complexes were both studied using Hirshfeld surface analyses and 2D fingerprint plots. Moreover, the photoluminescent properties of 1-3 indicate that the coordination anions make a great contribution to the fluorescent emission of Cd(Ⅱ) polymers.
- 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate,
- cadmium(Ⅱ) complex,
- luminescent property
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