Synthesis and identification of zeolite-encapsulated iron (II), iron (III)-hydrazone complexes

Complexes of Fe(II) and Fe(III) with N2O3 hydrazone ligand (SBSH) derived from salicyaldehyde and benzenesulphonylhydrazide have been encapsulated in zeolite Y-supercages by a diffusion method. The synthesized new materials have been characterized by combination of elemental analysis, FT-IR, UV-Vis., magnetic measurements, XRD, thermal analysis (TG, DTG and DTA) as well as surface area measurements and nitrogen adsorption studies. Additionally, the state of iron was evaluated by the use of Mössbauer spectroscopy at room temperature. Investigation of the stereochemistry of these incorporated chelates pointed out that, Fe(II) and Fe(III) ions in zeolite Y are coordinated with the SBSH ligand through the (CN), (SO2) and (OH) groups forming mononuclear structure in case of Fe(II) complex and binuclear structure in case of Fe(III) complex. The contribution of the water molecules in all cases was supposed to complete the coordination sphere. The intrazeolitic ferrous and ferric hydrazone complexes have distorted octahedral configuration and are thermally stable up to 543 and 900 °C, respectively.