Citation: Wenjuan SHI, Yuxuan LEI, Lei HOU, Yaoyu WANG. Synthesis, structure, and luminescence properties of trinucluear Cu(Ⅰ)-pyrazole complexes containing different substituent groups[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(3): 543-550. doi: 10.11862/CJIC.20250270 shu

Synthesis, structure, and luminescence properties of trinucluear Cu(Ⅰ)-pyrazole complexes containing different substituent groups

Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi′an 710127, China

Corresponding author: Lei HOU, lhou2009@nwu.edu.cn
Received Date: 24 August 2025
Revised Date: 9 December 2025

Figures(5)

Under solvothermal synthesis conditions, two pyridylpyrazole ligands with different substituents, 3, 5-dimethyl-4-(4-pyridyl)pyrazole (Hdmppz) and 3, 5-diethyl-4-(4-pyridyl)pyrazole (Hdeppz), were reacted with Cu(Ⅰ) ions to get two planar trinuclear [Cu(pz)]₃ complexes containing Cu₃N₆ nine-membered rings: [Cu(dmppz)]₃·H₂O (1) and [Cu(deppz)]₃ (2). The structures and properties of the ligands and complexes were characterized using elemental analysis, infrared spectroscopy, single-crystal X-ray diffraction, thermogravimetric analysis, and luminescence spectroscopy, exploring the effects of ligand substituents on the structures and properties of the complexes. The results showed that complex 1 belongs to the monoclinic crystal system with the P2₁/c space group, with lattice parameters a=0.746 65(5) nm, b=2.116 92(12) nm, c=2.004 46(10) nm, and β=107.725(2)°. Complex 2 also belongs to the monoclinic crystal system with the P2₁/c space group, with lattice parameters a=1.056 74(6) nm, b=2.283 14(13) nm, c=1.535 72(9) nm, and β=103.647 0(10)°. Both complexes exhibit abundant intramolecular and intermolecular Cu…Cu and Cu…π interactions, and the variation between methyl and ethyl substituent groups leads to different structural packing modes. Additionally, complexes 1 and 2 demonstrated high thermal stability (250 and 330 ℃) and strong blue-green and light green luminescence properties with the maximum emission wavelengths of 513 and 550 nm, respectively.
- Cu(Ⅰ) complex,
- crystal structure,
- trinuclear unit,
- pyrazole,
- luminescence
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