Synthesis, characterization, and thermal behavior of Cu(II) and Zn(II) complexes with (E)-2-[N′-(1-pyridin-2-yl-ethylidene)hydrazino]acetic acid (aphaOH). Crystal structure of [Zn₂(aphaO)₂Cl₂]

Abstract

Copper(II) and zinc(II) complexes with the condensation derivative of 2-acetylpyridine and hydrolyzed ethyl hydrazinoacetate were synthesized in a one pot reaction. Crystal structure of the zinc(II) complex was determined by single-crystal X-ray diffraction. In this binuclear complex, the ligand is coordinated via pyridine and imine nitrogen, while carboxylate oxygen is a bridge between metal centers. The fifth coordination site is occupied by a chloride, giving a distorted square pyramidal geometry around each zinc(II). The molecular structure of the copper(II) complex was determined from elemental analysis, infrared and electron paramagnetic resonance spectroscopy, molar conductivity, mass spectrometry, and measurements of the magnetic moment. Thermal behavior of both complexes was studied by thermogravimetric analysis coupled with mass spectrometer.

Keywords:

• Copper(II)
• Zinc(II)
• X-ray analysis
• EPR spectroscopy
• Thermogravimetric analysis

Acknowledgments

The authors would like to acknowledge the help of Dr S. Hoffmann and S. Scharsach from MPI CPfS in Dresden with the TG-MS measurements and data analyses, and Dr H. Borrmann for his help, guidance and support. N.F., M.J. and T.T. gratefully acknowledge the financial support by the Max Planck Society and the opportunity to work at MPI in Dresden, where a part of this work was done. This work was supported by the Ministry of Education and Science of the Republic of Serbia (Grant 172055).