Acesulfame complex compounds of some lanthanide group metal cations. Synthesis and characterization

Abstract

Some rare earth metal cations (Eu3+, Tb3+, HO3+ , Er3+ and Yb3+) of the acesulfame ligand and complex compounds were synthesized by hydrothermal method. Elemental analysis, infrared spectroscopy, mass analysis and solid-state UV-vis spectroscopy methods were used for the structural characterization of these compounds. In addition, TGA curves were recorded to determine the thermal degradation steps and possible degradation products of complex structures. As a result of the analysis of the structures, it was determined that the load equivalence of the metal cations having +3 oxidation steps provided with three monoanionic acesulfame ligands included in the structure. Rare earth elements, which have high coordination due to their large radii, are thought to exhibit hexadecimal coordination in synthesized molecules. The coordination sphere is complemented by two acesulfame and 2 aqua ligands showing acidic -N and carbonyl oxygen binding to the bidentate. One acesulfame ligand is thought to be located outside the coordination sphere as a counter ion. According to the recorded TGA curves, all molecules were found to contain one hydrate water. It was determined by FT-IR analysis that all complex structures formed the metal oxides in the reaction vessels as thermal decomposition products. (C) 2020 Elsevier B.V. All rights reserved.