Abstract
A new series of Mn(II)and Fe(III)chelates containing pyridine and phenolate-based ligands was synthesized by treating the metal salt in ethanol with the Schiff-bases, which were formed in situ. Analytical (C, H, N, and M), thermal analysis (thermogravimetric analysis & differential thermogravimetric), and spectroscopic techniques (IR, UV-Vis, ESR) in addition to molar conductance and magnetic measurements were employed to characterize the prepared metal chelates. Mono-nuclear metal complexes, with N(5)donor containing pentadentate Schiff-base ligands were obtained. In addition, two dibridged homobinuclear iron(III) complexes with N4O donors containing phenolate-based ligand were successfully isolated. Six-coordinate complex species in an octahedral environment is proposed for both Mn(II)and Fe(III)metal complexes. The density function theory study was used to optimize the geometrical shapes of three of the existing metal complexes and to identify some global reactivity descriptors. In addition, spectral data of PXRD with Expo 2014's structural solution software were utilized in the structural illustration of a representative Mn(II)and Fe(III)complexes. Aerobic catalytic oxidation of 4-tert-butylcatechol (4-TBCH2) ando-aminophenol under catalytic conditions was studied by using the present manganese(II) and iron(III) complexes. The synthesized Mn(II)and Fe(III)chelates exhibited a promising catalytic activity and probable catalytic sequences have been discussed.