The public discussion of the doctoral student (Atheer Abdul-Rahim Mahmoud) from the Department of Chemistry - College of Science - University of Anbar took place on Thursday, February 10, 2022 in Jaber bin Hayyan Hall in the College of Science for his thesis tagged: -

((Synthesis and Study of New Complexes of Dye Derivatives for Comparison with Laser Dyes Using Highly-Pure Nanoparticles))

In this project, organometallic complexes were synthesized by adding divalent ions like Zn2+, Ba2+ and Ca2+, or trivalent ions like Al3+ to ligands such as 8-hydroxyquinoline (8-HQ) ligand with different molar ratios (2:1 and 3:1) or a mixture of 8-HQ and 1,10-phenathroline with molar ratio of 1:1. The spectroscopic characteristics of the synthesized complexes were introduced by recording the absorption, photoluminescence and fluorescence spectra in the ultraviolet (UV), visible and infrared (IR) regions of electromagnetic spectrum. The structural and thermal characteristics of these complexes were also introduced using the x-ray diffraction (XRD), scanning electron microscopy (SEM), mass spectrometry (MS), gas chromatography (GC) and thermogravimetric analysis (TGA). Also, the melting points, electrical conductivities, solubility of these complexes were measured in different solvents with different properties, such as dipole moment, refractive index and polarity.

According to the measurements associated to the temperature, it was found that the synthesized complexes have good thermal stability as they showed melting temperatures higher than that of the 8-HQ ligand due to the linkage to metallic ions. The complexes were found to decompose at relatively high temperatures (>500°C). This makes these complexes suitable for applications in which the temperature has negative effect on the characteristics of dye complexes, such as laser dyes.