Synthesis, structure and magnetic characterization of a dinuclear and two mononuclear iron(III) complexes with N,O-donor Schiff base ligands

One centrosymmetric dinuclear and two mononuclear iron(III) Schiff base complexes, [(mu-OMe)(2)Fe-2(L-2(1))(N-3)(2)] (1) (1) {HL1 = 2-((2-(dimethylamino)ethylimino)methyl)-6-ethoxyphenol}, (FeL2(OH2)(N-3)]center dot CH3OH (2) {H2L2 = N,N'-bis(3-ethoxysalicylidene)propane-1,3-diamine) and [FeL3(OH2) (NCS)]center dot 2H(2)O (3) {H2L3 = N,N'-bis(3-methoxysalicylidene)propane-1,3-diamine}, have been synthesized and characterized by elemental analysis and spectral studies. X-ray diffraction analysis was used to determine the structures of all three complexes. Variable temperature (2-300 K) magnetic susceptibility (x) data of complex 1 show that both iron(III) centres in the complex are in a high spin configuration (S = 5/2) and present a moderate antiferromagnetic exchange interaction mediated through the double methoxido bridges (I= -43.7 cm(-1)) between the metal centres, that correlated well with previous magneto -structural correlations in double alkoxido bridged iron(III) dimers. (C) 2018 Elsevier Ltd. All rights reserved.