Structural, spectroscopic, and morphological characteriza-tions of metal-based complexes derived from the reaction of 1-phenyl-2-thiourea with Sr2+, Ba2+, Cr3+, and Fe3+ ions

The chemical reaction between 1-phenyl-2-thiourea as a ligand (termed PTU) with the metal ions Sr2+, Ba2+, Cr3+, and Fe3+ at a stoichiometry of 2:1 (PTU to metal ion) at 65 °C generated thermally stable metal-based complexes. The synthesized complexes were termed as Complex 1 (Sr2+), Complex 2 (Ba2+), Complex 3 (Cr3+), and Complex 4 (Fe3+). Elemental analyses, thermogravimetry (TG), Fourier-transform infrared (FT-IR) and ultraviolet/visible (UV-Visible) data suggested that the synthesized complexes can be formulated as [Sr(PTU)2(H2O)4]×Cl2 (Complex 1), [Ba(PTU)2(H2O)4]×Cl2 (Complex 2), [Cr(PTU)2(H2O)2Cl2]×Cl×4H2O (Complex 3), [Fe(PTU)2(H2O)2Cl2]×Cl×4H2O (Complex 4). The corresponding gross formulas for these complexes were C14H24N4S2O4Cl2Sr (534.96 g/mol), C14H24N4S2O4Cl2Ba (584.23 g/mol), C14H28N4S2O6Cl3Cr (570.79 g/mol), and C14H28N4S2O6Cl3Fe (574.63 g/mol), respectively. The X-ray diffraction and scanning electron microscope data demonstrated that the complexes exhibited high purity and possessed a uniform and well-structured morphology. KEY WORDS: 1-Phenyl-2-thiourea, Metal ion, Thermal decomposition, SEM, Morphology Bull. Chem. Soc. Ethiop. 2024, 38(6), 1803-1814. DOI: https://dx.doi.org/10.4314/bcse.v38i6.23