Abstract
The mixed ligand complexes containing acesulfame and nicotinamide ligands of rare earth metal cations Eu3+, Tb3+, Ho3+, Er3+ and Yb3+ were synthesized and their structural characterizations were examined. The complexes' thermal decomposition steps and structural properties were investigated by chemical analysis, infrared spectroscopy, mass analysis, and solid-state UV-vis spectroscopy and thermal analysis methods. According to the results obtained, it is suggested that the metal cations have six coordination sphere. It is recommended that the geometry of the complexes is distorted octahedral with two nicotinamide ligands that make neutral coordination over the nitrogen atom of the pyridine group, two aqua ligands and two monoanionic monodentate acesulfame ligands that coordinated via the acidic imine nitrogen. The coordination compounds perform charge balances with an anionic acesulfame situated the coordination sphere. Except for the Er3+ metal cation complex, it has been determined that all other structures have one hydrate water. From the thermal analysis curves, it was obtained that oxide derivatives of each metal cation were formed in the reaction pots as the last degradation products of Ho3+, Er3+ and Yb3+ complexes. It has been suggested that sulfate salts of related metal cations remain as thermal decomposition products in Eu3+ and Tb3+ metal cation-centered structures.
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