Synthesis and Spectral Characterization of Mono- and Homodinuclear Complexes of Co(II), Ni(II), and Cu(II) with a Compartmental Hexadentate Schiff Base Ligand Derived from 3-Formylsalicylic Acid

Abstract

Reaction between 3-formylsalicylic acid and 4,5-dichloro-1,2-phenylenediamine gave a compartmental hexadentate Schiff base (H4fsacph) with an N₂O₄ donor frame involving an inner N₂O₂ set of donors and an outer set of O₂O₂ donors. Three mononuclear complexes of the form M(H₂fsacph)(H₂O)₂ (M = Co(II), Ni(II), Cu(II), and three homodinuclear complexes M'2(fsacph)(H2O)2 (M' = Co(II), Ni(II)) and Cu2(fsacph) were isolated and analyzed by physico-chemical techniques. The metal ions have been found to occupy the outer coordination site in the mononuclear complexes and occupy both sites in the dinuclear complexes.