Study and use of the coordination compounds of transition metals with the original magnetic properties become more evident in chemical practice. Organic ligands have an important role in coordination chemistry. The recent publications concerning the salicylaldehyde derivatives reaction with different hydrazides leading to the formation of new type of soluble in water cationic ligands, can be used both for synthesis of solid bodies as well as for the analytical study of transition metal in aqueous solutions.[1-5]. In this presentation the synthesis of salicylaldehyde derivatives with Girard reagent T ((5-BrH2SalGT)Cl )and its iron(III) complexes are described. The non-coordinated reagent behaves in solutions as an electrolyte and seems to be a potential cationic ligand.formulaTo interaction of this ligand with Fe(III) salts gives rise to the formation of the compounds with different molar ratio, nuclearity and geometry. The coordinated ligand loses two protons and appears in the form of monoanion connected with the metal through the O, N, O donor set. The composition of the final product is depending on the concentration and nature of the anion.In the mononuclear species of the general formula Fe(5-Br-SalGT)X2 the Fe(III) atom is penta-coordinated and the coordination polyhedron is a trigonal bipyramid when X =Cl and a tetragonal bipyramide when X = NCS. The composition of the last complex is Fe(5-Br-SalGT)(NCS)2·H2O. The both complexes can be used as precursors for the building of new polynuclear compounds. In a such conditions a series of new coordination compounds of Fe(III) with (5-BrH2SalGT)Cl was obtained and investigated. Criomagnetic studies shown that the central atom is in d5 high spin state. In a number of complexes a weak intermolecular antiferomagnetic interactions between paramagnetic centers have been observed.