Citation: Ya-Nan YUAN, Zi-Xuan WANG, Zhao-Yang WANG, Yao-Yao SONG, Qing-Lun WANG, Chun YANG. Zinc(Ⅱ) and Cadmium(Ⅲ) Complexes Derived from 4′-(2-Pyridyl)-2, 2′: 6′, 2″-terpyridine: Crystal Structures and Fluorescence Property[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(9): 1878-1886. doi: 10.11862/CJIC.2022.194 shu

Zinc(Ⅱ) and Cadmium(Ⅲ) Complexes Derived from 4′-(2-Pyridyl)-2, 2′: 6′, 2″-terpyridine: Crystal Structures and Fluorescence Property

1.
School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
2.
Department of Chemistry, Nankai University, Tianjin 300071, China
3.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China

Corresponding author: Qing-Lun WANG, wangql@nankai.edu.cn Chun YANG, ychun@hebut.edu.cn
Received Date: 17 April 2022
Revised Date: 6 June 2022

Figures(9)

Complexes [Zn(2-pyterpy)₂](ClO₄)₂·0.25H₂O (1) and [Cd(2-pyterpy)₂]₂(ClO₄)₄·2.33H₂O·CH₃OH(2)(2-pyterpy=4'-(2-pyridyl)-2, 2'∶6', 2″-terpyridine) were synthesized under solvothermal conditions, and structurally characterized by elemental analysis, FT-IR spectra, X-ray single crystal diffraction and powder X-ray diffraction. X-ray single crystal diffraction results show that they crystallize in the triclinic system with the P1 space group. In solidstate, complexes 1 and 2 showed the maxima emission band approximately at 539 and 547 nm upon excitation at 405 nm, respectively. In methanol solution, complexes 1 and 2 exhibited emissions at 408 and 371 nm upon excitation at 357 and 352 nm, respectively. The metastable-state photoacid mPAH1 showed fluorescence at 556 nm upon excitation at 467 nm. When complex 1 was titrated with mPAH1, the fluorescence of complex 1 at 408 nm was quenched by mPAH1 with a quenching constant K_SV of 2.961×10⁴ L·mol^-1, but the fluorescence lifetime of complex 1 remained nearly unchanged, which is attributed to the inner filter effect. Conversely, titration of mPAH1 with complex 1 resulted in enhanced fluorescence of the mixed solution at 556 nm, which is attributed to partial protonation of complex 1 by mPAH1.
- zinc(Ⅱ) complex,
- cadmium(Ⅱ) complex,
- metastable-state photoacid,
- terpyridine,
- inner filter effect
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