Crystal structure and properties of a Cu(II) complex with the tridentate Schiff-base ligand, paeonol-(2-aminoethylpiperazine)

Abstract

A new copper Schiff-base complex [Cu(C₁₅H₂₃N₃O₂)(NO₃)]NO₃ was synthesized and characterized by spectroscopic (IR), thermal (TG/DTA) and electrochemical methods. Single crystal X-ray diffraction revealed that the complex is monoclinic, space group P2(1)/c, with a = 23.549(2), b = 6.583(12), c = 12.765(15) Å, β = 102.823(2)°, V = 1929.4(5) ų, Z = 4, D _calcd = 1.601 Mg m⁻³, F(000) = 964, goodness-of-fit = 1.034 and R ₁ = 0.0407. The Cu(II) is four-coordinate with distorted square planar geometry. The structure consists of isolated [Cu(C₁₅H₂₃N₃O₂)(NO₃)]⁺ and a nitrate, which are further linked to a 3D network by significant N–H ··· O, N–H ··· N hydrogen bonds and weak O ··· Cu interaction.

Keywords:

• Copper Schiff-base complex
• Crystal structure
• Electrochemical analysis
• 2-Aminoethylpiperazine
• Paeonol

Acknowledgements

This work is supported by the Major Project for Fundamental Research of Jiangsu Provincial Educational Committee, High Technical Foundation of Jiangsu Province (BG2006043), Natural Science Foundation of Jiangsu Provincial Educational Committee (No. 03KJD150031) and the Foundation of Science Committee of Huaihai Institute of Technology (No. Z2006005).