Table of Contents
International Journal of Inorganic Chemistry
Volume 2017 (2017), Article ID 7520640, 8 pages
Research Article

Five-Coordinate Zinc(II) Complex: Synthesis, Characterization, Molecular Structure, and Antibacterial Activities of Bis-[(E)-2-hydroxy-N′-1-(4-methoxyphenyl)ethylidenebenzohydrazido]dimethylsulfoxidezinc(II) Complex

1State Key Lab of Crystal Materials, Shandong University, Jinan 250100, China
2Department of Chemistry, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
3Center of Applied Sciences, Universiti Teknologi MARA, Kampus Kota Samarahan 2, 94300 Kota Samarahan, Sarawak, Malaysia

Correspondence should be addressed to Meng Guan Tay

Received 14 March 2017; Accepted 26 April 2017; Published 15 June 2017

Academic Editor: Hakan Arslan

Copyright © 2017 Zhi-Qiang Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The titled Zn(II) complex was synthesized by reacting the compound (E)-2-hydroxy-N′-1-(4-methoxyphenyl)ethylidenebenzohydrazide with zinc(II) acetate dihydrate in alkaline DMSO and ethanol solution under reflux condition for 28 hours. The resulting solid was filtered and recrystallized from the mixture of ethanol and DMSO. The hydrazone Schiff base and its Zn(II) complex were characterized using 1H, 13C NMR, FTIR, UV-Vis spectroscopy, and single crystal X-ray diffraction analysis. Meanwhile, their antibacterial activities were examined using disc diffusion method. The spectral studies showed that the hydrazone Schiff base underwent keto-enol tautomerization, forming a bidentate ligand (N,O) towards Zn(II) ion. Surprisingly, on top of the two hydrazone Schiff base molecules which coordinated to the Zn metal center, an additional DMSO molecule was found attached to the Zn metal center in the crystal data, resulting in a 5-coordinate distorted trigonal bipyramidal Zn(II) complex. Both hydrazone Schiff base and its Zn(II) complexes were found to exhibit low antibacterial activity even when the concentrations were increased to 800 ppm.