A Synthesis and structural characterizations of tris(hydroxymethyl)amino-methanecomplexes with groupIIA metals

DOI: 10.48129/kjs.11047

Abstract

An investigation has been made into the tendency of tris(hydroxymethyl) aminomethane (THAM) to form stable complexes with group IIA metals. Four new complexes of group IIA metals [Ba(II), Ca(II), Sr(II) and Mg(II)] with THAM were prepared and obtained as colorless solid products. The reactions were conducted by stoichiometry of 2:1 (Ligand: Metal ion) at 65 °C and pH of ~ 8.5. Under these conditions, the THAM molecule (C₄H₁₁NO₃) was deprotonated and transferred to the (C₄H₁₀NO₃^-; L^-) chelate with the metal ions forming colorless products. The structures of these complexes were determined by UV-visible, IR, Raman and ¹H NMR spectroscopies and other physicochemical and analytical methods (elemental analysis, thermogravimetry, and SEM). The outcome shows that the general composition of the complexes obtained with Ba(II), Ca(II), Sr(II) and Mg(II) ions are [BaL₂(H₂O)₂], [CaL₂(H₂O)₂]·2H₂O, [SrL₂(H₂O)₂], and [MgL₂(H₂O)₂]·4H₂O, respectively, and in all complexes, the symmetry was octahedral.