thermal studies of iron (ii) schiff base complexes: new precursors for preparation of α-fe2o3 nanoparticles via solid-state thermal decomposition

In this research study, four iron (ii) complexes of tetradentate n2o2 schiff base ligands with the general formula of fe((meo-bph)2am) (am=1,2- ethyelenediamine (1), 1,3-propanediamine (2), 1,4-buanediamine (3) and 2,2- dimethyl-1,3-propanediamine (4) were synthesized and characterized using the elemental analysis (chn) and ft-ir spectroscopy. thermal properties and decomposition stages of all the complexes were evaluated. finally, all complexes were decomposed at 600 °c for 3 h and the dark precipitates were characterized using the ft-ir, xrd and sem. ft-ir and xrd results revealed that the precipitate were the pure phase of rhombohedral of magnetite (α-fe2o3) nanoparticles. the sem images showed that, the morphology of the precipitate was a relatively spherical shape and average diameter of 40-70 nm. the results of the thermogravimetric analysis the iron (ii) complexes showed that the complexes 1–4 were stable until 140-200 °c. however, after that, all the complexes 1–4 decomposed in two stages at various temperatures.