Synthesis, crystal structure and magnetic properties of a new macrocyclic trinuclear Cu^II-Cu^II-Cu^II complex

Abstract

A new oxamido-bridged trinuclear copper(II) complex [(CuL)₂Cu](ClO₄)₂·0.5H₂O (L = the dianion of 2,3-dioxo-5,6,14,15-dibenzo-7,13-bis(ethoxycarbonyl)-1,4,8,12-tetraazacyclotetradeca-7,12-diene) has been synthesized by self-assembly and characterized. X-ray diffraction analysis reveals that the title complex is monoclinic, space group P2₁, with a = 16.213(5), b = 9.811(3), c = 18.802(6) Å, β = 96.790(5)°. The central copper(II) ion lies in a distorted octahedral environment. Terminal coppers have square pyramidal coordination geometry. Magnetic measurements show there is strong antiferromagnetic interaction between the central and the terminal Cu(II) ions.

Keywords:

• Macrocyclic ligand
• Oxamido-bridge
• Trinuclear complex
• Crystal structure
• Antiferromagnetic interaction

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 20331010) and the Tianjin Natural Science Foundation of China (033602011).