On the Formation of Mn(II) Anthranilic Acid Anilide Complexes. Structural Elucidation by TGA, IR, Electronic, EPR Spectra and Potentiometric Studies

Abstract

A new series of Mn(1I)-anilide complexes have been prepared and chara¬cterized by elemental analysis, TGA and IR spectra. Electronic and EPR spectra indicate octahedral geometry around the MN(II) ion, where the solvent mole¬cules (H20 or EtOH) occupy axial positions leading to the trans structure.The stability constants of the complexes in 50% dioxane are determined by potentionetric techniques. The values of the conditional stability constants depend on molecular structure. Deviation of the a-log K plots slopes from unity is attributed mainly to steric effect, Tt-electron back donation from the metal on or structural changes in the ligand.