A new oxamido-bridged dinuclear copper(II) complex with large antiferromagnetic exchange interactions

Abstract

A new oxamido-bridged dinuclear compound [Cu₂(µ-pmox)(DMF)₄] · 2ClO₄ (1) (H₂pmox = N,N′-bis-(2-methylpyridyl)oxalamide, DMF = dimethylformamide) was synthesized and structurally characterized. The five-coordinate Cu(II) is bridged by oxamido groups and further cross-linked by C–H···O hydrogen bonds between the uncoordinated oxygen of perchlorate and methyl of DMF. The complex was also characterized by infrared spectroscopy and magnetic measurement. The copper complex exhibits strong antiferromagnetic interactions via the trans oxamido bridge with J of −414 cm⁻¹, where J is the exchange parameter in the isotropic Hamiltonian H = −JS₁S₂.

Keywords:

• Copper(II) complex
• Oxamido-bridged
• Crystal structure
• Hydrogen bonds
• Antiferromagnetic

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20801040).