Synthesis, characterization and magnetic study of two new octahedral iron(III) complexes with pendant zwitterionic Schiff bases

摘要: Abstract Two Schiff bases, HL1 [2-((3-(dimethylamino)propylimino)methyl)-5-bromophenol] and HL2 [2-((2-(diethylamino)ethylimino)methyl)-6-methoxyphenol], have been employed to prepare two new octahedral iron(III) complexes, [Fe(HL1)2(N3)2]ClO4·2H2O (1) [Fe(HL2)2(NCS)2]ClO4·H2O (2). Both complexes are characterized by spectral elemental analyses. Single crystal X-ray diffraction studies confirm their structures. In both bases trapped in zwitterionic forms coordinated only through the imine nitrogen phenoxo oxygen, i.e., they behave as bi-dentate ligands, keeping remaining potential donor sites pendant. The measurement of χM vs. T for shows a continuous increase susceptibility temperature decreases. χM·T values from 300 2 K shape these curves discard existence high-spin/low-spin transition. decrease 1 with is more pronounced than that expected complex small zero-field splitting. magnetic behavior explained proposing physical mixture S = 5/2 S = 1/2 spins presence splitting species.