Synthesis, Characterization, and Magnetic Properties of Iron Complexes Bearing Polydentate Nitrogen Ligands

Four iron complexes {[PhN(CH2)2NH(SiMe3)]4FeLi·Et2O (1), [PhN(CH2)3NSiMe3]2FeLi(Et2O) (2), [PhN(CH2)2NCH(Ph)NSiMe3]2FeLi(Et2O)2 (3), and [PhN(CH2)3NCH(Ph)NSiMe3]2FeLi(Et2O)2 (4)} with polydentate nitrogen ligands were synthesized and structurally characterized by X-ray crystallography. The X-ray structures of complexes 1–4 show that they crystallize in three different systems. The magnetic properties of 1–4 were investigated. The magnetization trends of magnetic field intensity show the curves of Type-S, illustrating those complexes 1–4 are superparamagnetic.