A SYNTHETIC APPROACH TOWARDS HOMOTRINUCLEAR COMPLEXES - DESIGN OF MN(II), NI(II), CU(II) AND ZN(II) COMPLEXES USING A NEW UNSYMMETRICAL TETRADENTATE LIGAND

A new polydentate ligand able to generate homotrinuclear complexes has been designed. The synthetic process is as follows: the reaction of 3 -formyl-salicylic acid, H(2)fsa, with o-amino-benzoic acid, Hamb, lead s to a Schiff base, 3-((N-2-carboxyphenyl)formimidoyl)salicylic acid ( H(3)fsaamb), which has been characterized from its FTIR and H-1-NMR sp ectra. The reaction of H(3)fsaamb with MX2 salts ia a Na2CO3 or LiOH w ater/ethanol solution yields M-3(fsaamb)(2) . nH(2)O neutral complexes (M-II = Mn-II, Ni-II, Cu-II, Zn-II). The four complexes have been cha racterized by means of chemical analysis and spectroscopic methods. Th e magnetic data for the Mn-II, Ni-II, Cu-II complexes are in agreement with the presence of three paramagnetic centers within the homotrinuc lear species.