Citation: Zhaodong WANG. In situ synthesis, crystal structure, and magnetic characterization of a trinuclear copper complex based on a multi-substituted imidazo[1,5-a]pyrazine scaffold[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(3): 597-604. doi: 10.11862/CJIC.20240268 shu

In situ synthesis, crystal structure, and magnetic characterization of a trinuclear copper complex based on a multi-substituted imidazo[1,5-a]pyrazine scaffold

Zhaodong WANG

College of Chemistry and Environmental Engineering, Chongqing Key Laboratory for Resource Utilization of Heavy Metal Wastewater, Chongqing University of Arts and Sciences, Chongqing 402160, China

Received Date: 15 July 2024
Revised Date: 18 November 2024

Figures(6)

A trinuclear copper complex [Cu₃(L2)₂(SO₄)₂(H₂O)₇)]·8H₂O (1) (HL2=1-hydroxy-3-(pyrazin-2-yl)-N- (pyrazin-2-ylmethyl)imidazo[1, 5-a]pyrazine-8-carboxamide) with a multi-substituted imidazo[1, 5-a]pyrazine scaffold was serendipitously prepared from the reaction of the pro-ligand of H₂L1 (N, N′-bis(pyrazin-2-ylmethyl)pyrazine-2, 3-dicarboxamide) with CuSO₄·5H₂O in aqueous solution at room temperature. Complex 1 was characterized by IR, single-crystal X-ray analysis, and magnetic susceptibility measurements. Single-crystal X-ray analysis reveals that the complex consists of three Cu(Ⅱ) ions, two in situ transformed L2^- ligands, two coordinated sulfates, seven coordinated water molecules, and eight uncoordinated water molecules. Magnetic susceptibility measurement indicates that there are obvious ferromagnetic coupling interactions between the adjacent Cu(Ⅱ) ions in 1.
- amide ligand,
- copper complex,
- single crystal structure,
- C—N coupling,
- magnetic characterization
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