Nanoparticles of a new zinc(II) coordination polymer: synthesis, characterization, thermal, and structural studies

Abstract

Nanoparticles of a Zn(II) coordination polymer {[Zn(DADMBTZ)(CH₃COO)₂] _n , DADMBTZ = 2,2′-diamino-5,5′-dimethyl-4,4′-bithiazole} were synthesized by reaction of Zn(NO₃)₂ · 4H₂O, CH₃COONH₄ and DADMBTZ by a sonochemical method. The nanoparticles were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. [Zn(DADMBTZ)(CH₃COO)₂] _n was structurally characterized by single-crystal X-ray diffraction. In this four-coordinate compound with nearly C₂ symmetry, DADMBTZ is bidentate. The metal lies in a pseudo-tetrahedral environment and is ligated by the two bithiazole ring nitrogen atoms and an oxygen from each of the two monodentate acetates; 2-D networks are formed via N–H···O hydrogen bonds. Thermal stability of [Zn(DADMBTZ)(CH₃COO)₂] _n was studied by thermal gravimetric and differential thermal analyses. A ZnO nanostructure was obtained by direct thermolyses at 500°C under air. The ZnO nanostructure was characterized by SEM, XRD, and FT-IR spectroscopy.

Keywords:

• Bithiazole
• Nanoparticle
• Coordination polymer
• Zinc(II) oxide
• Sonochemical
• Thermal studies

Acknowledgments

The authors would like to acknowledge the financial support of University of Tehran for this research under grant number 24604/1/03. We thank the Tarbiat Modares University and also the Institute of Organoelement Compounds of the Russian Academy of Science for determining the crystal structure by X-ray crystallography.