A Synthetic Approach Towards Homotrinuclear Complexes: Design of Mn(II), Ni(II) AND Cu(II) Trinuclear Complexes Using Two New Unsymmetrical Tetradentate Ligands Derived from 3-Formylsalicylic Acid

Abstract

Two new polydentate ligands able to generate homotrinuclear complexes have been synthesized 3-(N-(2-pyridylmethyl)formimidoyl)salicylic acid (H₂fsaamp), 1, and 3-(N-(N′, N′-dimethylaminoethyl)formimidoyl)salicylic acid, H₂fsadme, 2. The synthetic process is as follows the reaction of 3-formylsalicylic acid, H₂fsa, with 2-(aminomethyl)pyridine and (N,N-dimethyi)ethylenediamine, respectively, leads to the Schiff bases H₂fsaamp and H₂fsadme. The two ligands have been characterized by chemical analyses, IR and ¹H NMR spectroscopy The reaction of these ligands with Mn(II), Cu(II) and Ni(II) perchlorates yields trinuclear complexes. Ni3(fsaamp)₂(H₂O)4(CIO₄)₂ (3), Cu₃(fsaamp)₂(H₂O)₂(CIO₄)₂ (4), Mn₃(fsadme)₂(H₂O)₄(CIO₄)₂ (5) and Cu₃(fsadme)₂(CIO₄)₂ (6), which have been characterized by means of chemical analyses and spectroscopic methods The magnetic data are in agreement with the presence of three paramagnetic centers within the homotrinuclear species