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Citation: Yang LIU, Jin TONG, Shuyan YU. Co(Ⅱ) coordination polymers: Structural characterization and fluorescence sensing of Al3+ in aqueous[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(11): 2399-2408. doi: 10.11862/CJIC.20250114 shu

Co(Ⅱ) coordination polymers: Structural characterization and fluorescence sensing of Al3+ in aqueous

  • Beijing Key Laboratory for Green Catalysis and Separation, College of Chemistry and Life Science, Beijing University of Technology, Beijing 100124, China

Figures(9)

  • Complexes [Co(hfacac)2(L1)]n (1) and [Co(hfacac)(L2)]n (2) (Hhfacac=hexafluoroacetylacetonate) were synthesized by coordinating Co(hfacac)2 with ligands 3, 6-di(pyridin-4-yl)-9H-carbazole (L1) and 9-methyl-3, 6-di(pyridin-4-yl)-9H-carbazole (L2), respectively. The complexes were characterized by infrared spectrometry, UV-Vis spectrometry, electrospray ionization mass spectrometry, and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis revealed that complex 2 crystallizes in a triclinic crystal system with the space group P1, and the unit cell volume is 1.928 7(2) nm3. The Co(Ⅱ) centers exhibit distorted octahedral coordination. One-dimensional chain structures of 2 are stabilized by hydrogen bonding and π-π stacking interactions. Fluorescence studies showed that complex 1 could be highly selective in Al3+ detection with a limit of detection of 51.3 nmol·L-1 and had a significant turn-on response to Al3+, which is attributed to the chelation-enhanced fluorescence (CHEF) mechanism. Furthermore, fluorescent test strips were developed for rapid in situ detection of Al3+.
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