Preparation and characterizations of metal-based complexes derived from the reaction of trizma base with Mg(II), Ca(II), and Ba(II) ions

Trizma base is a small organic compound that possesses one amino group (-NH2) and three hydroxyl groups (-OH). Three products of trizma base as a ligand were prepared from the reaction of Mg(II), Ca(II), and Ba(II) ions with the ligand at a temperature of 65 °C and stoichiometry of 1:1 (ligand to metal ion). The trizma ligand was referred to as Tris, and its complexes with Mg(II), Ca(II), and Ba(II) ions were referred to as Product 1, Product 2, and Product 3, respectively. After the preparation of the products, they were characterized by several analytical methods, including spectroscopies [Fourier-transform infrared (FT-IR) and ultraviolet/visible (UV-visible)], thermogravimetry (TG), elemental analyses, X-ray diffraction (XRD), and scanning electron microscope with environmental mode (ESEM). Analytical results suggested that Tris ligand captured the investigated metal ions using the amino group (-NH2) and one hydroxyl group (-OH) forming complexes with general composition of [MgTris(H2O)4]·Cl2·2H2O (Product 1), [CaTris(H2O)4]·Cl2·2H2O (Product 2), [BaTris(H2O)4]·Cl2·H2O (Product 3). The corresponding gross formulas for these products were C4H23NO9MgCl2 (324.34), C4H23NO9CaCl2 (340.11), and C4H21NO8BaCl2 (419.37 g/mol), respectively. SEM micrographs captured at high levels of magnification (×100,000) clearly illustrate variations in the morphology of products 1, 2, and 3. KEY WORDS: Trizma base, Spectral analysis, Thermogravimetry, SEM micrographs Bull. Chem. Soc. Ethiop. 2024, 38(6), 1791-1801. DOI: https://dx.doi.org/10.4314/bcse.v38i6.22