Synthesis, characterization, crystal structure and magnetic properties of dissymmetrical doub'e Schiff base heterotrinuclear complexes with N-3-carboxylsalicylidene-N'-salicylidene-1,3-propylenediamine trivalent anions

A new dissymmetrical double Schiff base Cu(II) mononuclear complex: Cu(HLt) (1), where H(3)Lt is N-3-carboxylsalicylidene-N'-salicylidene-1,3-propylenediamine) and its two heterotrinuclear complexes: [(CuLt)(2)Ni]center dot 2.5H(2)O (2) and [(CuLt)(2)Mn]center dot 5H(2)O (3) have been synthesized and characterized by means of elemental analyses, IR and electronic spectra. The crystal structure of the complex 3 was determined by X-ray analysis. Each dissymmetrical cell unit of the complex 3 contains one heterotrinuclear neutral molecule, in which the central Mn2+ ion is located at the site of O-6 with a distorted octahedral geometry and two terminal Cu2+ ions are located at the 4-coordination site of N2O2. The magnetic properties of the two heterotrinuclear complexes have been determined in the temperature range 5 similar to 300 K, indicating that the interaction between the central M2+ ion and the outer Cu2+ ions is antiferromagnetic. The exchange integrals are equal to - 57.7 cm(-1) for 2 and - 28.5 cm(-1) for 3.