Abstract
[NiCl2(C14H12N2)(H2O)] complex has been synthesized from nickel chloride hexahydrate (NiCl2·6H2O) and 2,9-dimethyl-1,10-phenanthroline (dmphen) as N,N-bidentate ligand. The synthesized complex was characterized by elemental analysis, infrared (IR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and differential thermal/thermogravimetric analysis (TG/DTA). The complex was further confirmed by single crystal X-ray diffraction (XRD) as triclinic with space group P-1. The desired complex, subjected to thermal decomposition at low temperature of 400 ºC in an open atmosphere, revealed a novel and facile synthesis of pure NiO nanoparticles with uniform spherical particle; the structure of the NiO nanoparticles product was elucidated on the basis of Fourier transform infrared (FT-IR), UV-vis spectroscopy, TG/DTA, XRD, scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDXS) and transmission electron microscopy (TEM).
Highlights
The mononuclear 2,9-dimethyl-1,10-phenanthroline-nickel(II) complex was isolated in excellent yield by stirring equivalent amounts of 2,9-dimethyl-1,10-phenanthroline in distilled water with
nickel oxide (NiO) nanoparticles were successfully synthesized through thermal decomposition of the (2,9-dimethyl-1,10-phenanthroline)NiCl2 complex precursor at 400 °C
NiO is formed via decomposition of 2,9-dimethyl-1,10-phenanthroline organic and chloride ligands in open atmosphere to NiO powder product and COx, NOx, ClOx as expected gases bi-products
Summary
Nickel oxide (NiO) bulk and nano size have received considerable attention due to their wide range of applications in different fields, such as: catalysis [1,2,3], fuel cell electrodes and gas sensors [4,5,6,7], electrochromic films [8,9,10], battery cathodes [11,12,13,14,15] magnetic materials [16,17,18], and photovoltaic devices [19]. Transition metals complexes of phenanthroline ligands are of interest to researchers because of their role in molecular scaffolding in DNA cleaving, structural studies, building blocks for the synthesis of metallo-drimers, thin films of luminescent properties, control of redox properties, analytical chemistry, and catalysis [22,23,24,25,26,27,28,29,30,31,32]. Direct thermal decomposition process of the desired complex precursor is one of the most important and straightforward strategies to access structurally elaborated and pure NiO nanoparticles with regular spherical particle
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