Crystal Structures and Biological Studies Two Novel Zinc Complexes Derived from para-Vanillin and Acetylacetone. Two New Precursors for Preparation ZnO Nanoparticles

Resumo

In the present study, two new zinc complexes with the chemical formulas of [Zn(2-Ampy)(Acac)₂] (I) and [Zn(p-Van)₂(H₂O)₂] (II) were synthesized and characterized by FT-IR, ¹H NMR, and UV-Vis spectroscopy. Moreover, the crystal structures of the complexes were determined by X-ray diffraction technique. Single-crystal X-ray diffraction analyses (CIF files CCDC nos. 1513672 (I) and 1513673 (II)) revealed that complex I has a distorted square pyramid environment, and complex II has a distorted octahedral geometry. The complexes were also screened for in vitro antibacterial activities against some bacteria. The results show that complexes have the effective antibacterial activities. The complexes were employed to prepare ZnO nanoparticles by the combustion synthesis method at 700°C for 8 h. The nanoparticles were characterized, using powder X-ray diffraction analysis (PXRD), scanning electron microscopy and transmission electron microscope. PXRD analysis showed the presence of pure phase in both samples. Furthermore, the crystallite size was approximately 37 and 42 nm for ZnO prepared from complexes I and II, respectively.